[ { "id": "https://authors.library.caltech.edu/records/bqgtp-fze51", "eprint_id": 78727, "eprint_status": "archive", "datestamp": "2023-08-19 03:46:21", "lastmod": "2023-10-26 00:20:02", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } }, { "id": "Keady-G", "name": { "family": "Keady", "given": "G." } }, { "id": "Imberger-J", "name": { "family": "Imberger", "given": "J." } } ] }, "title": "A Note on Algae Population Dynamics", "ispublished": "unpub", "full_text_status": "public", "note": "All three authors benefited greatly, both professionally and personally, from their extensive interactions with the late Professor John R. Blake. The first and second authors are also deeply grateful to the third for his hospitality, support and encouragement during their visits to the University of Western Australia.\n\n
Submitted - Plank6Blake.pdf
", "abstract": "All three authors had the pleasure of extensive technical interactions with John Blake during his career in the UK, USA and Australia and benefited both professionally and personally from his friendship. John's work in developing fundamental mathematical solutions for Stokes' flows and his application of those mathematical tools to analyses of micro-organism locomotion led to special new insights into that world of small-scale swimming. This special issue devoted to John's memory seems an appropriate occasion to present another fluid mechanical challenge associated with micro-organisms, namely the dynamics of algae blooms. \n\nThough it is a special reduced-order model that is of limited practical value, John would have particularly enjoyed the analytical solution to the dynamics of algae that was presented by Rutherford Aris (1997) in a somewhat eccentric paper. We revisit that solution in this paper and present an extension to Aris' solution that includes sedimentation of the algae. We think that John would have enjoyed this solution and would, in all likelihood, have been able to expand upon it to include other features such as micro-organism buoyancy variations\n(see, for example, Kromkamp et al. 1990, Belov and Giles 1997, Brookes and Ganf 2001), the death of algae (see, for example, Serizawa et al. 2008a, Reynolds 1984), the swimming of algae (see, for example, Pedley 2016), and other relevant hydrodynamic matters.", "date": "2017-06-30", "date_type": "published", "publisher": "IMA Journal of Applied Mathematics", "id_number": "CaltechAUTHORS:20170630-110356943", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170630-110356943", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "Plank6Blake.pdf", "url": "https://authors.library.caltech.edu/records/bqgtp-fze51/files/Plank6Blake.pdf" }, "resource_type": "monograph", "pub_year": "2017", "author_list": "Brennen, C. E.; Keady, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/9b1zv-2me60", "eprint_id": 72870, "eprint_status": "archive", "datestamp": "2023-08-19 08:14:15", "lastmod": "2023-10-23 23:01:54", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C." } } ] }, "title": "Convective instability of a non-uniformly viscous sphere with reference to the earths mantle", "ispublished": "unpub", "full_text_status": "public", "note": "Submitted - Mantle.pdf
", "abstract": "The principal concern of this paper is with the thermal convective instabilities of a non-uniformly viscous liquid sphere heated internally by some distribution of heat sources. Solutions are first obtained which correspond to an extension of the classic theory for uniformly viscous spheres for (1) radial variations of viscosity and (2) near critical Reynolds numbers. This results in instability growth rates which strongly suggest that the earth's mantle must have been in a highly supercritical state for the present convective pattern to have been established within the earth's lifetime. The paper then proceeds to a different theoretical calculation for incipient growth rates for such supercritical situations. For the earth's mantle this results in typical growth times of the order of 10^5 years. Various outer boundary conditions of the fixed and free type are explored; a true free surface condition is also examined and results in the establishment of a Froude number-like parameter governing distortion of the outer surface. In addition it is demonstrated that the spherical harmonics of degree 3 or 4 which seem to dominate the present convective pattern in the earth's mantle would do so in the theoretical construction if the increase of viscosity with depth within the mantle were such that the deep mantle viscosity was some four times the upper mantle value.", "date": "2016-12-16", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20161215-162022695", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161215-162022695", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "Mantle.pdf", "url": "https://authors.library.caltech.edu/records/9b1zv-2me60/files/Mantle.pdf" }, "resource_type": "monograph", "pub_year": "2016", "author_list": "Brennen, C." }, { "id": "https://authors.library.caltech.edu/records/gvw3g-d1415", "eprint_id": 45276, "eprint_status": "archive", "datestamp": "2023-08-19 21:08:44", "lastmod": "2023-10-26 17:55:12", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karyeaclis-M-P", "name": { "family": "Karyeaclis", "given": "Michael P." } }, { "id": "Miskovish-R-S", "name": { "family": "Miskovish", "given": "R. Scott" } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "Christopher E." } } ] }, "title": "Rotordynamic Tests in Cavitation of the SEP Inducer", "ispublished": "unpub", "full_text_status": "public", "note": "Report E200.27 on contract with Soci\u00e9t\u00e9 Europ\u00e9enne de Propulsion, Division \u00e0 Liquides et Espace, Vernon, France.\n\n\nThe authors would like to thank Professors Alan Acosta and Thomas Caughey for their valuable suggestions and assistance throughout this investigation. We\nwould especially like to thank Ron Franz, whose help was instrumental in performing the tests.\n\nIn addition, we would like to thank Sophie Verzat of SEP for her help during the preliminary stages of the tests, Vianney Duthoit and Adiel Guinzburg for their\nhelp in taking the data, and Joe Fontana for helping with the installation of the auxiliary pump.\n\nFinally, we appreciate the generous donation of the auxiliary pump by the Byron-Jackson Co.\n\nPublished - Report_No._E200.27.pdf
", "abstract": "The problem of rotordynamic instability has had a long history and a significant\nimpact on the design and operation of rotating machinery. As the search for higher\npower density and sophistication intensified, so have efforts to understand better\nand solve the instability problem and the difficulties often associated with it, such\nas noise and vibration, excessive bearing loads, loss of performance and catastrophic\nfailure.", "date": "2014-04-29", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:20140429-101027105", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140429-101027105", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Soci\u00e9t\u00e9 Europ\u00e9enne de Propulsion, Division \u00e0 Liquides et Espace" } ] }, "primary_object": { "basename": "Report_No._E200.27.pdf", "url": "https://authors.library.caltech.edu/records/gvw3g-d1415/files/Report_No._E200.27.pdf" }, "resource_type": "monograph", "pub_year": "2014", "author_list": "Karyeaclis, Michael P.; Miskovish, R. Scott; et el." }, { "id": "https://authors.library.caltech.edu/records/t4kq2-amh75", "eprint_id": 39504, "eprint_status": "archive", "datestamp": "2023-08-19 15:33:17", "lastmod": "2023-10-24 16:52:22", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brantley-K-S", "name": { "family": "Brantley", "given": "Katherine S." } }, { "id": "Hunt-M-L", "name": { "family": "Hunt", "given": "Melany L." }, "orcid": "0000-0001-5592-2334" }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } } ] }, "title": "Booming sand dunes: field measurements", "ispublished": "unpub", "full_text_status": "public", "note": "We wish to thank Prof. Ron Scott, Prof. Norman Brooks, Prof. Lee Silver, Dr. Steve\nHostler, Dr. Gustavo Joseph, Steve Gao, Nora DeDontney, Angel Ruiz-Angulo, Fu-Ling\nYang, Patricio Romano-Pringles, and A. Ransom Williams.\n\nSubmitted - BRA226.pdf
", "abstract": "\"Booming dunes\" are large desert sand dunes that make a loud droning or humming noise during\nan avalanching of sand. The phenomenon has been observed for censturies, yet it remains largely\nunexplained. This note demonstrates that the booming frequency does not scale with the size of\nthe particle or with the shearing speed of the avalanching sand. Instead, the dune may act as a\nwaveguide with a fundamental frequency that depends on the sound speed within the dune and\nthe depth of the loose dry sand layer.", "date": "2013-07-23", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:20130722-150325006", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130722-150325006", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "BRA226.pdf", "url": "https://authors.library.caltech.edu/records/t4kq2-amh75/files/BRA226.pdf" }, "resource_type": "monograph", "pub_year": "2013", "author_list": "Brantley, Katherine S.; Hunt, Melany L.; et el." }, { "id": "https://authors.library.caltech.edu/records/d36qf-0as15", "eprint_id": 235, "eprint_status": "archive", "datestamp": "2023-08-22 14:00:34", "lastmod": "2023-10-13 20:35:00", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meyer-P-A", "name": { "family": "Meyer", "given": "P. A." } }, { "id": "Stewart-C-W", "name": { "family": "Stewart", "given": "C. W." } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } } ] }, "title": "Effects of Crust Ingestion on Mixer Pump Performance in Tank", "ispublished": "unpub", "full_text_status": "public", "note": "Prepared for the U.S. Department of Energy under Contract DE-AC06-76RLO 1830.", "abstract": "In August 1999, a workshop was held at Pacific Northwest National Laboratory to discuss the effects of crust ingestion on mixer pump performance in Hanford Waste Tank 241-SY-101. The main purpose of the workshop was to evaluate the potential for crust ingestion to degrade mixing and/or damage the mixer pump. The need for a previously determined 12-inch separation between the top of the mixer pump inlet and the crust base was evaluated. Participants included a representative from the pump manufacturer, an internationally known expert in centrifugal pump theory, Hanford scientists and engineers, and operational specialists representing relevant fields of expertise.\n\nThe workshop focused on developing an understanding of the pump design, addressing the physics of entrainment of solids and gases into the pump, and assessing the effects of solids and gases on pump performance. The major conclusions are summarized as follows:\n\n* Entrainment of a moderate amount of solids or gas from the crust should not damage the pump or reduce its lifetime, though mixing effectiveness will be somewhat reduced.\n\n* Air binding should not damage the pump. Vibration due to ingestion of gas, solids, and objects potentially could cause radial loads that might reduce the lifetime of bearings and seals. However, significant damage would require extreme conditions not associated with the small bubbles, fine solids, and chunks of relatively weak material typical of the crust.\n\n* The inlet duct extension opening, 235 inches from the tank bottom, should be considered the pump inlet, not the small gap at 262 inches.\n\n* A suction vortex exists at the inlet of all pumps. The characteristics of the inlet suction vortex in the mixer pump are very hard to predict, but its effects likely extend upward several feet. Because of this, the current 12-inch limit should be replaced with criteria based on actual monitored pump performance. The most obvious criterion (in addition to current operational constraints) is to monitor discharge pressure and cease pump operation if it falls below a predetermined amount.\n\n* There are no critically necessary tests to prove pump operability or performance before initiating the transfer and back-dilution sequence.", "date": "1999-09-01", "date_type": "published", "publisher": "Pacific Northwest National Laboratory", "id_number": "CaltechAUTHORS:MEYpnnl99", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:MEYpnnl99", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "MEY194.pdf", "url": "https://authors.library.caltech.edu/records/d36qf-0as15/files/MEY194.pdf" }, "resource_type": "monograph", "pub_year": "1999", "author_list": "Meyer, P. A.; Stewart, C. W.; et el." }, { "id": "https://authors.library.caltech.edu/records/85v3n-bq611", "eprint_id": 28669, "eprint_status": "archive", "datestamp": "2023-08-20 01:21:29", "lastmod": "2023-10-24 18:04:14", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Guinzburg-A", "name": { "family": "Guinzburg", "given": "A." } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } }, { "id": "Acosta-A-J", "name": { "family": "Acosta", "given": "A. J." } }, { "id": "Caughey-T-K", "name": { "family": "Caughey", "given": "T. K." } } ] }, "title": "The Effect of Inlet Swirl on the Rotordynamic Shroud\n Forces in a Centrifugal Pump", "ispublished": "unpub", "full_text_status": "public", "note": "The assistance provided by F. Zhuang, A. Bhattacharyya,\nF. Rahman and Sandor Nagy with the\nexperimental program is greatly appreciated. We would\nalso like to thank NASA George Marshall Space Flight\nCenter for support under Grant NAG8-118.\n\nPublished - ASME_92-GT-126.pdf
", "abstract": "The role played by fluid forces in determining the\nrotordynamic stability of a centrifugal pump is gaining\nincreasing attention. The present research investigates\nthe contributions to the rotordynamic forces from the\ndischarge-to-suction leakage flows between the front\nshroud of the rotating impeller and the stationary pump\ncasing. In particular, the dependency of the rotordynamic\ncharacteristics of leakage flows on the swirl at the inlet to\nthe leakage path was examined . An inlet guide vane was\ndesigned for the experiment so that swirl could be\nintroduced at the leakage flow inlet. The data demonstrates\nsubstantial rotordynamic effects and a destabilizing\ntangential force for small positive whirl ratios; this force\ndecreased with increasing flow rate. The effect of swirl on\nthe rotordynamic forces was found to be destabilizing.", "date": "1992-06", "date_type": "published", "publisher": "American Society of Mechanical Engineers", "id_number": "CaltechAUTHORS:20120105-103828941", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120105-103828941", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA", "grant_number": "NAG8-118" } ] }, "other_numbering_system": { "items": [ { "id": "92-GT-126", "name": "ASME Papers" } ] }, "primary_object": { "basename": "ASME_92-GT-126.pdf", "url": "https://authors.library.caltech.edu/records/85v3n-bq611/files/ASME_92-GT-126.pdf" }, "resource_type": "monograph", "pub_year": "1992", "author_list": "Guinzburg, A.; Brennen, C. E.; et el." }, { "id": "https://authors.library.caltech.edu/records/b7b9d-afg79", "eprint_id": 28670, "eprint_status": "archive", "datestamp": "2023-08-19 20:37:36", "lastmod": "2023-10-24 18:04:16", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arndt-N", "name": { "family": "Arndt", "given": "N." } }, { "id": "Acosta-A-J", "name": { "family": "Acosta", "given": "A. J." } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } }, { "id": "Caughey-T-K", "name": { "family": "Caughey", "given": "T. K." } } ] }, "title": "Rotor-Stator Interaction in a Diffuser Pump", "ispublished": "unpub", "full_text_status": "public", "note": "The authors are indebted to the NASA George Marshall Space Flight Center for continued sponsorship of this research under contract NAS8-33108.\n\nPublished - ASME_88-GT-55.pdf
", "abstract": "The interaction between impeller blades and diffuser vanes in a diffuser\npump was investigated. Steady and unsteady pressure measurements were\ntaken on the diffuser vanes, and the shroud wall of a vaned and a vane less\ndiffuser. Steady, unsteady, and ensemble averaged unsteady data, as well as\nfrequency spectra are presented. The measurements were made for different\nflow coefficients, shaft speeds, and radial gaps between impeller blade\ntrailing and diffuser vane leading edge (1.5% and 4.5% based on impeller\ndischarge radius). The resulting lift on the vane, both steady and unsteady,\nwas computed from the pressure measurements at mid vane height. The\nmagnitude of the fluctuating lift was found to be greater than the steady\nlift. The pressure fluctuations were larger on the suction side than on the\npressure side attaining their maximum value, of the same order of magnitude\nas the total pressure rise across the pump, near the leading edge. Pressure\nfluctuations were also measured across the span of the vane. and those near\nthe shroud were significantly smaller than those near the hub. The pressure\nfluctuations on the shroud wall itself were larger for the vaned diffuser than\na vaneless diffuser. Lift, vane pressure, and shroud wall pressure fluctuations\ndecreased strongly with increasing radial gap.", "date": "1988-06", "date_type": "published", "publisher": "American Society of Mechanical Engineers", "id_number": "CaltechAUTHORS:20120105-105138689", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120105-105138689", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA", "grant_number": "NAS8-33108" } ] }, "other_numbering_system": { "items": [ { "id": "88-GT-55", "name": "ASME Paper" } ] }, "primary_object": { "basename": "ASME_88-GT-55.pdf", "url": "https://authors.library.caltech.edu/records/b7b9d-afg79/files/ASME_88-GT-55.pdf" }, "resource_type": "monograph", "pub_year": "1988", "author_list": "Arndt, N.; Acosta, A. J.; et el." }, { "id": "https://authors.library.caltech.edu/records/6819e-vnh65", "eprint_id": 233, "eprint_status": "archive", "datestamp": "2023-08-22 02:55:37", "lastmod": "2023-10-13 20:34:54", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } } ] }, "title": "A Review of Added Mass and Fluid Inertial Forces", "ispublished": "unpub", "full_text_status": "public", "keywords": "Fluid mechanics, Fluid-structure interaction, Added mass, Fluid inertial forces, Ocean engineering", "note": "\u00a9 1982 Christopher Earls Brennen. Creative Commons Attribution (CC-BY) https://creativecommons.org/licenses/by/3.0/us/ \n\nReport Number CR 82.010. Contract Number N62583-81-MR-554\n\nPublished - BRE052-wm.pdf
", "abstract": "This report reviews the existing state of knowledge concerning the evaluation of the forces imposed on a body in a fluid due to acceleration of either the body or the fluid. It concentrates on those fluid inertial forces due to acceleration rather than on the drag/lift forces due to steady motion. The first part of the report presents a survey of the analytical background including the definition of added mass, the structure of the added mass matrix and other effects such as the influence of viscosity, fluid compressibility and the proximity of solid and free surface boundaries. Then the existing data base from experiments and potential flow calculations is reviewed. Approximate empirical methods for bodies of complex geometry are explored in a preliminary way. The possible dramatic effects of the proximity of the ocean bottom are further highlighted. The confused state of affairs regarding the possibly major effects of viscosity in certain regimes of frequency and Reynolds number is discussed. Finally a number of recommendations stemming from ocean engineering problems are put forward.", "date": "1982-01", "date_type": "published", "publisher": "Department of the Navy", "id_number": "CaltechAUTHORS:BREncel82", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:BREncel82", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "BRE052-wm.pdf", "url": "https://authors.library.caltech.edu/records/6819e-vnh65/files/BRE052-wm.pdf" }, "resource_type": "monograph", "pub_year": "1982", "author_list": "Brennen, C. E." }, { "id": "https://authors.library.caltech.edu/records/a63x2-z8p81", "eprint_id": 6814, "eprint_status": "archive", "datestamp": "2023-08-22 02:45:57", "lastmod": "2023-10-16 20:33:15", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Charles-A-L", "name": { "family": "Charles", "given": "A. L." } }, { "id": "Chelvakumar-Kasivisvanathan", "name": { "family": "Chelvakumar", "given": "K." } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C. E." } }, { "id": "Acosta-A-J", "name": { "family": "Acosta", "given": "A. J." } } ] }, "title": "Synfuel systems. A review of letdown devices and other multiphase flow problems", "ispublished": "unpub", "full_text_status": "public", "note": "Report No. E200.5\n\nAccepted Version - CHA048.pdf
", "abstract": "In an effort to develop domestic sources of energy, a number of processes to convert coal to clean fuels have been investigated. Products of these processes span the range from clean coal substitutes, to synthetic crude oil, to synthetic natural gas. Some of these processes, after successful operation in the laboratory, are now operating on a pilot plant scale to determine the feasibility of further scale up. These pilot plants range in capacity from 1/1000 to 1/10 of that projected for commercial operation [1]. At the pilot plant scale, problem areas which are generic to the conversion process have come to light. These problem areas include: handling of highly abrasive slurries, three phase heat transfer, high temperatures, high pressure, and high pressure slurry letdown. \n\nIn this report the problems associated with high pressure slurry letdown from the reactor/dissolver to the fractionating section will be discussed. The operating experience and the current state of the art for high pressure letdown valves in the coal conversion industry and the process industry will be examined. Also, the commonly used valve sizing techniques will be examined in relation to the problem of sizing for high pressure letdown. A summary of the instrumentation needed to monitor the letdown process for valve development, and ultimately for process control, is also included.", "date": "1981-09", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:CHA048", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:CHA048", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "CHA048.pdf", "url": "https://authors.library.caltech.edu/records/a63x2-z8p81/files/CHA048.pdf" }, "resource_type": "monograph", "pub_year": "1981", "author_list": "Charles, A. L.; Chelvakumar, K.; et el." }, { "id": "https://authors.library.caltech.edu/records/e8gkz-fp049", "eprint_id": 238, "eprint_status": "archive", "datestamp": "2023-08-22 00:01:41", "lastmod": "2023-10-13 20:35:04", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Whitney-A-K", "name": { "family": "Whitney", "given": "Arthur K." } }, { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "Christopher E." } }, { "id": "Wu-T-Y-T", "name": { "family": "Wu", "given": "T. Yao-tsu" } } ] }, "title": "Experimental Verification of Cavity-Flow Wall Effects and Correction Rules", "ispublished": "unpub", "full_text_status": "public", "note": "Report (U) No. E-97A-18. Contract NO0014-67-A-0094-0012.\n\nThe authors have pleasure in expressing their appreciation and gratitude to Professor Francis Clauser for invaluable encouragement, and to the Division of Engineering and Applied Science of the California Institute of Technology for the entire support to carry out the experimental investigation using the High-speed Water Tunnel facility of the Hydrodynamics Laboratory.\n\nThe early part of the main theoretical study was carried out under the support of the Naval Ship System Command General Hydrodynamics Research Program, SR 009 01 01, and Hydrofoil Advanced Development Program S 46-06, Contract N00014-67-A-0094-0007, administered by the Naval Ship Research and Development Center, with the results reported by Wu, Whitney and Lin (1969), and the latter part, with further results presented herein, under the support of the Office of Naval Research.", "abstract": "This report is intended as a companion to Report No. E-111A.5, \"Wall Efects in Cavity Flows\", by Wu, Whitney and Lin. Some simple rules for the correction of wall effect are derived from that theoretical study. Experiments designed to complement the theory and to inspect the validity of the correction rules were then carried out in the high-speed water tunnel of the Hydrodynamics Laboratory, California Institute of Technology. The measurements on a series of fully cavitating wedges at zero angle of attack suggested that of the theoretical models that due to Riabouchinsky is superior. They also confirmed the accuracy of the correction rule derived using that model and based on a measurement of the minimum pressure along the tunnel wall.", "date": "1970-11-01", "date_type": "published", "publisher": "California Institute of Technology", "id_number": "CaltechAUTHORS:WHIcitr70", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:WHIcitr70", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "WHI012.pdf", "url": "https://authors.library.caltech.edu/records/e8gkz-fp049/files/WHI012.pdf" }, "resource_type": "monograph", "pub_year": "1970", "author_list": "Whitney, Arthur K.; Brennen, Christopher E.; et el." }, { "id": "https://authors.library.caltech.edu/records/p1y8c-wrw14", "eprint_id": 43, "eprint_status": "archive", "datestamp": "2023-08-21 20:32:48", "lastmod": "2023-10-13 20:24:59", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "Christopher" } } ] }, "title": "Some Cavitation Experiments with Dilute Polymer Solutions", "ispublished": "unpub", "full_text_status": "public", "note": "National Physical Laboratory. Ship Division. Ship Report Report 123.\n\nThis work is part of the research programme of the Ship Division of the National Physical Laboratory.\n\nThe author is deeply indebted to Mr. David Swindells, who took responsibility for the photography and produced such excellent results. I also wish to thank Dr. G. E. Gadd for valuable discussions on the subject matter.", "abstract": "A previous paper (Brennen (1968b)) reported the observation and analysis of wave patterns on the surface of fully developed cavities behind a series of axisymmetric headforms in No.2 water tunnel at Ship Division, NPL. Comparison of theory and experiment appeared to confirm that these waves, which appeared a short distance after separation, grew in amplitude as they were convected downstream and then under certain conditions broke up into turbulence, were the amplified result of a select frequency instability in the separated or cavity surface boundary layer.\n\nThe small vertical tunnel (figure 1) was employed to study and extend observation of the same phenomenon to smaller headforms and Reynolds numbers. An additional intention was to investigate the effect of small quantities of polymer additive on the behaviour of this instability. But, a more dramatic phenomenon was manifest with the addition of these drag-reducing chemicals, leaving the original objective unattainable.", "date": "1968-11", "date_type": "published", "publisher": "National Physical Laboratory", "id_number": "CaltechAUTHORS:BREnpl68b", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:BREnpl68b", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "BRE004.pdf", "url": "https://authors.library.caltech.edu/records/p1y8c-wrw14/files/BRE004.pdf" }, "resource_type": "monograph", "pub_year": "1968", "author_list": "Brennen, Christopher" }, { "id": "https://authors.library.caltech.edu/records/efyd2-3h988", "eprint_id": 42, "eprint_status": "archive", "datestamp": "2023-08-21 23:43:54", "lastmod": "2023-10-13 20:24:57", "type": "monograph", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brennen-C-E", "name": { "family": "Brennen", "given": "C." } } ] }, "title": "Wave Patterns on the Surface of Hydrodynamic Cavities", "ispublished": "unpub", "full_text_status": "public", "note": "National Physical Laboratory. Ship Division. Ship Report 121.\n\nThis work is part of the research programme of the Ship Division of the National Physical Laboratory. The author wishes to thank Mr. S. Grant for assistance in carrying out the experimental investigations, Dr. A. Davey (Aerodynamics Division) for extensive aid in the computer program for the solution of the eigenvalue problem and Dr. G. E. Gadd for valuable discussions on the subject.", "abstract": "In experiments on cavities behind various axisymmetric headforms, a pattern of waves or ripples with crests parallel to the separation line was observed on the cavity surface just downstream of separation. A theoretical analysis suggests that this pattern results from amplified instabilities in the separated laminar boundary layer on the cavity surface.", "date": "1968-08-01", "date_type": "published", "publisher": "National Physical Laboratory", "id_number": "CaltechAUTHORS:BREnpl68a", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:BREnpl68a", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "BRE003.pdf", "url": "https://authors.library.caltech.edu/records/efyd2-3h988/files/BRE003.pdf" }, "resource_type": "monograph", "pub_year": "1968", "author_list": "Brennen, C." } ]