[ { "id": "https://authors.library.caltech.edu/records/shc3c-g6327", "eprint_id": 71239, "eprint_status": "archive", "datestamp": "2023-08-19 16:35:55", "lastmod": "2023-10-23 15:31:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Laguna-G-A", "name": { "family": "Laguna", "given": "G. A." } } ] }, "title": "Nonlinear Interactions in the Fluid Mechanics of Helium II", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1984 Annual Reviews. \n\nThe authors would like to acknowledge the many helpful discussions with faculty and students at GALCIT. The assistance of D. M. Moody and J. R. Torczynski was of great value in the preparation of the manuscript. The schlieren photographs (Figure 20) were taken by Dagmar Gerthsen during her stay at GALCIT. Jacquelyn Beard's patient use of the CIT word processor was essential to the on-time completion of this paper and is gratefully acknowledged.", "abstract": "Besides its practical importance in a host of technical applications, fluid\nmechanics retains its intrinsic interest as a physical discipline. The\ngoverning equations are nonlinear, and hence the motion of fluids\ndemonstrates the complexities of solution of a nonlinear field theory, a fact\nthat has been appreciated more and more in recent times. The most striking\nmanifestations of this nonlinearity are shock waves and turbulence,\ncorresponding to nonlinear wave and vortex interactions, respectively.", "date": "1984-01", "date_type": "published", "publication": "Annual Review of Fluid Mechanics", "volume": "16", "publisher": "Annual Reviews", "pagerange": "139-177", "id_number": "CaltechAUTHORS:20161018-152858115", "issn": "0066-4189", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161018-152858115", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1146/annurev.fl.16.010184.001035", "resource_type": "article", "pub_year": "1984", "author_list": "Liepmann, H. W. and Laguna, G. A." }, { "id": "https://authors.library.caltech.edu/records/mmvts-41k88", "eprint_id": 32494, "eprint_status": "archive", "datestamp": "2023-08-19 15:01:48", "lastmod": "2023-10-18 14:29:44", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Nosenchuck-D-M", "name": { "family": "Nosenchuck", "given": "D. M." } } ] }, "title": "Active control of laminar-turbulent transition", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1982 Cambridge University Press.\nReceived 21 November 1981.\nPublished online: 20 April 2006.\n\n
Published - LIEjfm82b.pdf
", "abstract": "Instability waves, commonly called T-S waves, can be introduced in a laminar boundary layer by periodic heating of flush-mounted heating elements. Experiments have demonstrated that nearly complete cancellation of a T-S wave excited in this way can be achieved by using a second downstream heating element with a suitable phase shift. As one application of the technique, a single element together with a feedback loop activated by measured wall shear stress has been used to reduce the amplitude of naturally occurring laminar instability waves. A significant increase in the transition Reynolds number has been achieved.", "date": "1982-05", "date_type": "published", "publication": "Journal of Fluid Mechanics", "volume": "118", "publisher": "Cambridge University Press", "pagerange": "201-204", "id_number": "CaltechAUTHORS:20120717-085352812", "issn": "0022-1120", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120717-085352812", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1017/S0022112082001037", "primary_object": { "basename": "LIEjfm82b.pdf", "url": "https://authors.library.caltech.edu/records/mmvts-41k88/files/LIEjfm82b.pdf" }, "resource_type": "article", "pub_year": "1982", "author_list": "Liepmann, H. W. and Nosenchuck, D. M." }, { "id": "https://authors.library.caltech.edu/records/n5ref-p7d21", "eprint_id": 32160, "eprint_status": "archive", "datestamp": "2023-08-19 15:01:43", "lastmod": "2023-10-17 23:00:32", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Brown-G-L", "name": { "family": "Brown", "given": "G. L." } }, { "id": "Nosenchuck-D-M", "name": { "family": "Nosenchuck", "given": "D. M." } } ] }, "title": "Control of laminar-instability waves using a new technique", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1982 Cambridge University Press.\nReceived 30 June 1981; Published Online 20 April 2006.\nThe authors gratefully acknowledge support of this work by the Office of Naval Research under Contracts NO00 14-78-C-0457.\n\nPublished - LIEjfm82a.pdf
", "abstract": "A new technique using surface-film activators has been developed to induce and control laminar-instability waves by periodic heating. A flat plate was instrumented\nand installed in the GALCIT High-speed Water Tunnel with flush-mounted surface heaters and probes. Extremely two-dimensional naturally occurring Tolmien-Schlichting (TS) waves were observed along with the subsequent formation of turbulent spots. Laminar-instability waves were then excited in a controlled fashion using the surface-mounted heaters. A preliminary experiment on cancellation of\nexcited laminar-instability waves was carried out. Finally, turbulent spots were produced using amplitude-modulated bursts to form Gaussian TS wave packets.\nFlow visualization, along with wall shear measurements, was used to infer the velocity and vorticity field near the wall.", "date": "1982-05", "date_type": "published", "publication": "Journal of Fluid Mechanics", "volume": "118", "publisher": "Cambridge University Press", "pagerange": "187-200", "id_number": "CaltechAUTHORS:20120627-155913693", "issn": "0022-1120", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120627-155913693", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)", "grant_number": "N00014-78-C-0457" } ] }, "doi": "10.1017/S0022112082001025", "primary_object": { "basename": "LIEjfm82a.pdf", "url": "https://authors.library.caltech.edu/records/n5ref-p7d21/files/LIEjfm82a.pdf" }, "resource_type": "article", "pub_year": "1982", "author_list": "Liepmann, H. W.; Brown, G. L.; et el." }, { "id": "https://authors.library.caltech.edu/records/w0051-b6b50", "eprint_id": 33114, "eprint_status": "archive", "datestamp": "2023-08-19 09:24:09", "lastmod": "2023-10-18 18:48:44", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } } ] }, "title": "Fluid Dynamics of Liquid Helium", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1975 Society for Industrial and Applied Mathematics.\nReceived by the editors March 15, 1974. Presented by invitation at an International Symposium on Modern Developments in Fluid Dynamics in honor of the 70th birthday of Sydney Goldstein, held at Haifa, Israel, December 16-23, 1973.\nThis research was supported in part by the Alfred P. Sloan Foundation and in part by the Air Force Office of Scientific Research.\nThe general direction of the research was outlined by the author some time\nago; it could not have been carried out without the very active participation of\nDrs. J. E. Broadwell, J. C. Cummings, P. E. Dimotakis and V. C. Rupert who, at\nvarious stages of the research, contributed work, ideas and criticism.\n\nPublished - LIEsiamjam75.pdf
", "abstract": "Liquid helium at low temperatures owes its existence to h through the zero point energy classically it should be solid. ^(4)He the common isotope, owes its peculiar behavior as a fluid to its spin and hence again to h; classically the difference between ^(3)He and ^(4)He should be trivial.\nIn liquid helium flow we deal with a system which still shows all the usual behavior of a liquid plus\nsome additional strange properties which reflect directly macroscopic quantum effects. The governing\nequations of motion due largely to Landau and London are, except in their linearized form, not as well\nfounded and most certainly less well confirmed than one would like. Consequently, the experimental\nfluid dynamicist working with helium should have a field day exploring flow problems in an atmosphere\nmore adventureous than with any ordinary fluid. This indeed is often the case. One does, however,\nruefully discover that some of the more interesting and significant flow configurations which one likes\nto study in this strange field are by no means sufficiently well explored in the corresponding classical\ncases. One therefore likes to design simple fluid flow experiments which bring out the essentially new\nproperties of He II and permit an experimental contribution to, or decision among, the theories of\nHe II flow. In this spirit, experiments associated with the propagation of shock waves in liquid helium\nhave been initiated at GALCIT. The design and construction of a cryogenic shock tube and its application\nto liquid helium are discussed in this paper.", "date": "1975-05", "date_type": "published", "publication": "SIAM Journal on Applied Mathematics", "volume": "28", "number": "3", "publisher": "Society for Industrial and Applied Mathematics", "pagerange": "689-699", "id_number": "CaltechAUTHORS:20120813-092543887", "issn": "0036-1399", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120813-092543887", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Alfred P. Sloan Foundation" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" } ] }, "doi": "10.1137/0128058", "primary_object": { "basename": "LIEsiamjam75.pdf", "url": "https://authors.library.caltech.edu/records/w0051-b6b50/files/LIEsiamjam75.pdf" }, "resource_type": "article", "pub_year": "1975", "author_list": "Liepmann, H. W." }, { "id": "https://authors.library.caltech.edu/records/1gjmj-c2d02", "eprint_id": 3201, "eprint_status": "archive", "datestamp": "2023-08-22 00:20:13", "lastmod": "2023-10-16 15:42:32", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Cummings-J-C", "name": { "family": "Cummings", "given": "J. C." } }, { "id": "Rupert-V-C", "name": { "family": "Rupert", "given": "Viviane C." } } ] }, "title": "Cryogenic shock tube", "ispublished": "pub", "full_text_status": "public", "note": "\u00a91973 American Institute of Physics. \n\nThis research effort has been sponsored by the Air Force Office of Scientific Research, Grant No. AF-AFOSR-71-2092.", "abstract": "Two shock tubes have been developed which allow for partial or full immersion of the test sections within a cryogenic bath. One tube is used for the study of shock-wave interactions with strong density gradients, and the other to obtain very large shock Mach numbers with ideal gas conditions in all flow regions.", "date": "1973-02-01", "date_type": "published", "publication": "Physics of Fluids", "volume": "16", "number": "2", "publisher": "Physics of Fluids", "pagerange": "332-333", "id_number": "CaltechAUTHORS:LIEpof73", "issn": "1070-6631", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:LIEpof73", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.1694339", "primary_object": { "basename": "LIEpof73.pdf", "url": "https://authors.library.caltech.edu/records/1gjmj-c2d02/files/LIEpof73.pdf" }, "resource_type": "article", "pub_year": "1973", "author_list": "Liepmann, H. W.; Cummings, J. C.; et el." }, { "id": "https://authors.library.caltech.edu/records/fd0ez-w3x85", "eprint_id": 38397, "eprint_status": "archive", "datestamp": "2023-08-19 06:25:03", "lastmod": "2023-10-23 20:07:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Coles-D-E", "name": { "family": "Coles", "given": "D." } }, { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Roshko-A", "name": { "family": "Roshko", "given": "A." } }, { "id": "Sturtevant-B", "name": { "family": "Sturtevant", "given": "B." } } ] }, "title": "Shock Tubes in Rarefied Gas Flow Research", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1969 American Institute of Physics.\n\nPublished - Coles_1969pI-179.pdf
", "abstract": "The flow within a shock wave is governed by the relaxation times of the molecular degrees of freedom.\nAdvances in shock-tube design and instrumentation in recent years have made it possible to resolve all the\nrelaxation times including the shortest, corresponding to the translational degrees of freedom. The shock\ntube thus becomes an important tool for critical experiments in the study of the range of applicability of\nthe Navier-Stokes equations and similar approximations and of the character of solutions of the Boltzmann\nequation. Significant progress has recently been made in the understanding of the most obvious such problem,\nthe flow within a shock in a monatomic gas. Theory and experiment are now in substantial agreement and\nthe over-all process of energy exchange is understood. Progress has been made in problems connected with\nshock wave reflection from real walls, but a host of others remain to be studied including surface interaction\neffects. The extension of this type of shock-tube research to more complicated systems, reacting gases, gas\nmixtures, and the like has begun and some progress can be reported. Recent experimental progress is illustrated\nby a number of measurements made in the 6- and 17-in. shock tubes at the California Institute of\nTechnology.", "date": "1969-05", "date_type": "published", "publication": "Physics of Fluids", "volume": "12", "number": "5", "publisher": "American Institute of Physics", "pagerange": "I-179", "id_number": "CaltechAUTHORS:20130509-142125916", "issn": "1070-6631", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130509-142125916", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1063/1.1692612", "primary_object": { "basename": "Coles_1969pI-179.pdf", "url": "https://authors.library.caltech.edu/records/fd0ez-w3x85/files/Coles_1969pI-179.pdf" }, "resource_type": "article", "pub_year": "1969", "author_list": "Coles, D.; Liepmann, H. W.; et el." }, { "id": "https://authors.library.caltech.edu/records/yxtj9-f8y97", "eprint_id": 38408, "eprint_status": "archive", "datestamp": "2023-08-19 05:55:06", "lastmod": "2023-10-23 20:08:24", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Coles-D-E", "name": { "family": "Coles", "given": "D." } }, { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Roshko-A", "name": { "family": "Roshko", "given": "A." } }, { "id": "Sturtevant-B", "name": { "family": "Sturtevant", "given": "B." } } ] }, "title": "Shock Tubes in Rarefied Gas Flow Research", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1968 American Institute of Physics.\n\nPublished - Coles_1968p782.pdf
", "abstract": "The flow\nwithin a shock wave is governed by the relaxation times of\nthe molecular degrees of freedom. Advances in shock tube\ndesign and instrumentation have made it possible in recent\nyears to resolve all the relaxation times including the shortest,\ncorresponding to the translational degree of freedom.\nThe shock tube thus becomes an important tool for critical\nexperiments in the study of the range of applicability of the\nNavier-Stokes equations and similar approximations and of\nthe character of solutions of the Boltzmann equation. Significant\nprogress has been made recently in the understanding\nof the most obvious such problem, the flow within a shock in\na monatomic gas. Theory and experiment are now in substantial\nagreement and the over-all process of energy exchange\nis understood. Problems connected with shock wave\nreflection from real walls have made progress but a host of\nproblems remain to be studied including surface interaction\neffects. The extension of this type of shock tube research to\nmore complicated systems, reacting gases, gas mixtures,\nand the like has begun and some progress can be reported.\nRecent experimental progress is illustrated by a number of\nmeasurements made at GALCIT in the 17- and 6-in. shock\ntubes. Sophistications in shock tube design and instrumentation\nwill be discussed.", "date": "1968", "date_type": "published", "publication": "Bulletin of the American Physical Society", "volume": "13", "number": "5", "publisher": "American Institute of Physics", "pagerange": "782-782", "id_number": "CaltechAUTHORS:20130510-081002532", "issn": "0003-0503", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130510-081002532", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "primary_object": { "basename": "Coles_1968p782.pdf", "url": "https://authors.library.caltech.edu/records/yxtj9-f8y97/files/Coles_1968p782.pdf" }, "resource_type": "article", "pub_year": "1968", "author_list": "Coles, D.; Liepmann, H. W.; et el." }, { "id": "https://authors.library.caltech.edu/records/aq5fx-3dc35", "eprint_id": 34288, "eprint_status": "archive", "datestamp": "2023-08-19 04:12:37", "lastmod": "2023-10-19 14:49:27", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Narashima-R", "name": { "family": "Narashima", "given": "R." } }, { "id": "Chahine-M-T", "name": { "family": "Chahine", "given": "M. T." } } ] }, "title": "Structure of a Plane Shock Layer", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1962 The American Institute of Physics.\n\nReceived 12 July 1962.\n\nHelpful discussions with Dr. J. D. Cole during the early part of this work are gratefully acknowledged. The work is the combined result of efforts started from different angles by the authors and made possible by the support of the National Aeronautics and Space Administration (Contract No. NAS7-100, and Research Grant NsG-40-60) and the Office of Naval Research [Contract N-onr 220 (21)].\n\nPublished - LIEpof62.pdf
", "abstract": "The structure of a plane shock wave is discussed and the expected range of applicability of the Navier\u2010Stokes equations within the shock layer is outlined. The shock profiles are computed using the Bhatnagar\u2010Gross\u2010Krook model of the Boltzmann equation and a uniformly converging iteration scheme starting from the Navier\u2010Stokes solution. It is shown that the Navier\u2010Stokes solution remains a good approximation in the high\u2010pressure region of the shock layer up to approximately the point of maximum stress for all shock strengths. In the low\u2010pressure region, the correct profiles deviate with increasing shock strength from the Navier\u2010Stokes solution. The physical significance of the kinetic model used and the relation of the present study to previous theoretical and experimental work is discussed.", "date": "1962-11", "date_type": "published", "publication": "Physics of Fluids", "volume": "5", "number": "11", "publisher": "American Institute of Physics", "pagerange": "1313-1324", "id_number": "CaltechAUTHORS:20120921-134953075", "issn": "1070-6631", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120921-134953075", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA", "grant_number": "NAS7-100" }, { "agency": "Office of Naval Research", "grant_number": "NsG-40-60" } ] }, "doi": "10.1063/1.1706527", "primary_object": { "basename": "LIEpof62.pdf", "url": "https://authors.library.caltech.edu/records/aq5fx-3dc35/files/LIEpof62.pdf" }, "resource_type": "article", "pub_year": "1962", "author_list": "Liepmann, H. W.; Narashima, R.; et el." }, { "id": "https://authors.library.caltech.edu/records/z8ejr-5kj55", "eprint_id": 38395, "eprint_status": "archive", "datestamp": "2023-08-19 04:06:34", "lastmod": "2023-10-23 20:07:48", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Roshko-A", "name": { "family": "Roshko", "given": "Anatol" } }, { "id": "Coles-D-E", "name": { "family": "Coles", "given": "Donald" } }, { "id": "Sturtevant-B", "name": { "family": "Sturtevant", "given": "Bradford" } } ] }, "title": "A 17-inch Diameter Shock Tube for Studies in Rarefied Gasdynamics", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1962 American Institute of Physics.\nReceived February 27, 1962; and in final form, April 9, 1962.\n\nThis work was carried out under the sponsorship of the\nNational Aeronautics and Space Administration. The\nauthors would like to acknowledge the contribution of the\nfine craftsmanship of Lewis Balthasar to the progress of\nthe work.\n\nPublished - RevSciInstrum_33_625.pdf
", "abstract": "A shock tube for studying problems in rarefied gasdynamics is described. The motivation for operating at low density (to increase the length and time scales of certain interesting flows) and the effect of low density on the performance and design of the shock tube are discussed. In order to guarantee uniform and reproducible shock waves of moderate strength, the configuration of the tube is conventional. However, innovations are introduced (for example in the suspension, the pumping system, and the diaphragm loading and rupturing mechanism) to simplify the operation of the large facility. Care in the design of the tube as a vacuum system has resulted in a leak rate of less than 0.01 \u03bc Hg per hour. A series of shakedown runs at relatively high pressures has shown, for example, that the reproducibility of a given shock Mach number is \u00b10.6%.", "date": "1962-06", "date_type": "published", "publication": "Review of Scientific Instruments", "volume": "33", "number": "6", "publisher": "American Institute of Physics", "pagerange": "625-631", "id_number": "CaltechAUTHORS:20130509-141109412", "issn": "0034-6748", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130509-141109412", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1063/1.1746625", "primary_object": { "basename": "RevSciInstrum_33_625.pdf", "url": "https://authors.library.caltech.edu/records/z8ejr-5kj55/files/RevSciInstrum_33_625.pdf" }, "resource_type": "article", "pub_year": "1962", "author_list": "Liepmann, H. W.; Roshko, Anatol; et el." }, { "id": "https://authors.library.caltech.edu/records/0t38w-km896", "eprint_id": 3499, "eprint_status": "archive", "datestamp": "2023-08-21 23:01:51", "lastmod": "2023-10-16 15:57:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } }, { "id": "Vlases-G", "name": { "family": "Vlases", "given": "G." } } ] }, "title": "Magnetically driven cylindrical shock waves", "ispublished": "pub", "full_text_status": "public", "note": "Copyright \u00a9 1961 American Institute of Physics. \n\nReceived April 6, 1961. \n\nThe experiments are made possible by the Francis I. duPont Fund for Magnetohydrodynamic Research and by a fellowship of the National Science Foundation to one of us.", "abstract": "Nearly every experiment on shock-wave propagation uses plane waves. Cylindrical and spherical waves are more difficult to produce, usually decay fast and do not offer any particular advantages. In magneto-fluid dynamics, however, it is possible to produce cylindrical waves easily and the axisymmetric geometry is a natural choice to study motion across magnetic field lines.", "date": "1961-07-01", "date_type": "published", "publication": "Physics of Fluids", "volume": "4", "number": "7", "publisher": "Physics of Fluids", "pagerange": "927-928", "id_number": "CaltechAUTHORS:LIEpof61", "issn": "1070-6631", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:LIEpof61", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.1706428", "primary_object": { "basename": "LIEpof61.pdf", "url": "https://authors.library.caltech.edu/records/0t38w-km896/files/LIEpof61.pdf" }, "resource_type": "article", "pub_year": "1961", "author_list": "Liepmann, H. W. and Vlases, G." }, { "id": "https://authors.library.caltech.edu/records/pzsxd-srp07", "eprint_id": 119910, "eprint_status": "archive", "datestamp": "2023-08-19 01:15:14", "lastmod": "2023-10-25 16:47:36", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "Hans Wolfgang" } } ] }, "title": "The Interaction Between Boundary Layer and Shock Waves in Transonic Flow", "ispublished": "pub", "full_text_status": "public", "note": "The author wishes to acknowledge the cooperation of Mrs. K. Liepmann and of Messrs. H. Ashkenas and J. D. Cole.", "abstract": "Experiments of transonic flow past a circular arc profile show that the shock-wave pattern and the pressure distribution are strongly dependent upon the state of the boundary layer. A change from laminar to turbulent boundary layer at a given Mach Number changes the flow pattern considerably. \n\nShock waves can interact with the boundary layer in a manner similar to a reflection from a free jet boundary. These shock waves are not distinctly discernible from pressure distribution measurements.", "date": "1946-12", "date_type": "published", "publication": "Journal of the Aeronautical Sciences", "volume": "13", "number": "12", "publisher": "Institute of the Aeronautical Sciences", "pagerange": "623-637", "id_number": "CaltechAUTHORS:20230309-962584000.1", "issn": "1936-9956", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230309-962584000.1", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "collection": "CaltechAUTHORS", "local_group": { "items": [ { "id": "GALCIT", "value": "GALCIT" } ] }, "doi": "10.2514/8.11473", "resource_type": "article", "pub_year": "1946", "author_list": "Liepmann, Hans Wolfgang" }, { "id": "https://authors.library.caltech.edu/records/fxwkt-4fp96", "eprint_id": 1087, "eprint_status": "archive", "datestamp": "2023-08-21 22:02:36", "lastmod": "2023-10-13 22:07:38", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liepmann-K", "name": { "family": "Liepmann", "given": "K." } }, { "id": "Liepmann-H-W", "name": { "family": "Liepmann", "given": "H. W." } } ] }, "title": "A Dewpoint Meter Using Cooling by Expansion of CO2", "ispublished": "pub", "full_text_status": "public", "note": "Copyright \u00a9 1945 American Institute of Physics \n\n(Received November 29, 1944)", "abstract": "For use in certain aerodynamical problems a dewpoint meter using the Joule-Thompson effect, with CO2 as cooling agent, has been developed. The instrument described here has some advantages over the common instrument which depends oupon the evaporation of ether. Two slightly different devices have been used successfully.", "date": "1945-02-01", "date_type": "published", "publication": "Review of Scientific Instruments", "volume": "16", "number": "2", "publisher": "Review of Scientific Instruments", "pagerange": "36-37", "id_number": "CaltechAUTHORS:LIErsi45", "issn": "0034-6748", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:LIErsi45", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.1770319", "primary_object": { "basename": "LIErsi45.pdf", "url": "https://authors.library.caltech.edu/records/fxwkt-4fp96/files/LIErsi45.pdf" }, "resource_type": "article", "pub_year": "1945", "author_list": "Liepmann, K. and Liepmann, H. W." } ]