[ { "id": "authors:ysnyq-r4213", "collection": "authors", "collection_id": "ysnyq-r4213", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120724-150711842", "type": "article", "title": "Viscous effects on the position of cavitation separation from smooth bodies", "author": [ { "family_name": "Arakeri", "given_name": "Vijay H.", "clpid": "Arakeri-V-H" } ], "abstract": "Flow visualization by the schlieren technique in the neighbourhood of a fully developed cavity on two axisymmetric headforms has shown the existence of laminar boundary-layer separation upstream of cavitation separation, and the distance between the two separations to be strongly dependent on Reynolds number. Based on present results, a semi-empirical method is developed to predict the position of cavitation separation on a smooth body. The method applies only in the Reynolds-number range when the cavitating body possesses laminar boundary-layer separation under non-cavitating conditions. Calculated positions of cavitation separation on a sphere by the method show good agreement with experimentally observed positions", "doi": "10.1017/S0022112075001231", "issn": "0022-1120", "publisher": "Cambridge University Press", "publication": "Journal of Fluid Mechanics", "publication_date": "1975-04", "series_number": "4", "volume": "68", "issue": "4", "pages": "779-799" }, { "id": "authors:0kgy6-7de38", "collection": "authors", "collection_id": "0kgy6-7de38", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150410-103711329", "type": "book_section", "title": "Some transition and cavitation inception observations on a 1.5 cal ogive", "author": [ { "family_name": "Arakeri", "given_name": "V. H.", "clpid": "Arakeri-V-H" }, { "family_name": "Acosta", "given_name": "A. J.", "clpid": "Acosta-A-J" } ], "contributor": [ { "family_name": "Wu", "given_name": "T. Y.", "clpid": "Wu-T-Y-T" }, { "family_name": "Hoyt", "given_name": "J. W.", "clpid": "Hoyt-J-W" } ], "abstract": "Transition observation on a 1. 5 cal ogive were carried out by Schlieren technique of flow visualization up to Re_D of 1.26 x 10^6. Good agreement is found between computed position of transition by Smith method and those observed by Schlieren technique for tunnel velocities greater than 50 fps (Re_D> 7.85 x 10^5). Cavitation under desinent conditions at tunnel velocities of 30 fps and 40 fps was found to occur within the transition region of the boundary layer. At 50 fps good agreement is found between the present value of inception cavitation index, the value of desinent cavitation index measured by Parkin and the negative value of the pressure coefficient at both predicted and observed positions of transition. These observations strongly suggest that cavitation inception is closely related to transition on smooth bodies at supercritical Reynolds numbers.", "publisher": "California Institute of Technology", "publication_date": "1975" }, { "id": "authors:djgj3-7xn33", "collection": "authors", "collection_id": "djgj3-7xn33", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:ARAjfe73", "type": "article", "title": "Viscous Effects in the Inception of Cavitation on Axisymmetric Bodies", "author": [ { "family_name": "Arakeri", "given_name": "V. H.", "clpid": "Arakeri-V-H" }, { "family_name": "Acosta", "given_name": "A. J.", "clpid": "Acosta-A-J" } ], "abstract": "Cavitation inception and development on two axisymmetric bodies was studied with the aid of a Schlieren flow visualization method developed for that purpose. Both bodies were found to exhibit a laminar boundary layer separation; cavitation inception was observed to occur within this region of separated flow. The incipient cavitation index was found to be closely correlated with the magnitude of the pressure coefficient at the location of flow separation on one of the bodies. There is also experimental evidence that events at the site of turbulent reattachment of the separated flow may also greatly influence cavitation inception.", "issn": "0098-2202", "publisher": "Journal of Fluids Engineering", "publication": "Journal of Fluids Engineering", "publication_date": "1973-12-01", "series_number": "4", "volume": "95", "issue": "4", "pages": "519-527" }, { "id": "authors:954sp-jzm45", "collection": "authors", "collection_id": "954sp-jzm45", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141015-142028989", "type": "monograph", "title": "Viscous Effects in Inception and Development of Cavitation on Axi-Symmetric Bodies Part I - Cavitation Inception Part II - A Semi-Empirical Method to Predict Cavitation Separation on Smooth Bodies", "author": [ { "family_name": "Arakeri", "given_name": "Vijay H.", "clpid": "Arakeri-V-H" } ], "abstract": "The schlieren method was developed as a flow visualization\ntechnique for use in water tunnels. The process of cavitation development on two axi-symmetric bodies was studied using this approach and found to be greatly influenced by the presence of a previously unreported\nviscous laminar separation. On these bodies, cavitation inception was observed to take place within this separated region which occurs far downstream of the minimum pressure point. On one of these bodies, the incipient cavitation index was found to be closely correlated with the\nnegative value of the pressure coefficient at the point of laminar separation. Approximate computations of the position of transition on a body without laminar separation indicate that the incipient cavitation index\nis closely correlated with the negative value of the pressure coefficient at the predicted point of transition.\n\nCavitation separation under fully developed conditions is found to be preceded by a viscous laminar boundary layer separation on bodies which possess the latter separation under fully wetted conditions. An empirical method is proposed to compute the position of cavitation\nseparation on such bodies and the method applied to a sphere and a cylinder showed good agreement with experiments.", "publisher": "California Institute of Technology", "publication_date": "1973-01" }, { "id": "authors:4w54w-nwk56", "collection": "authors", "collection_id": "4w54w-nwk56", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141014-132257280", "type": "monograph", "title": "Water Tunnel Investigations of Scale Effects in Cavitation Detachment from Smooth Slender Bodies and Characteristics of Flow Past a Bi-Convex Hydrofoil", "author": [ { "family_name": "Arakeri", "given_name": "Vijay H.", "clpid": "Arakeri-V-H" } ], "abstract": "Experimental results concerning force coefficients and cavity detachment points under various cavitating conditions on two geometrically similar bi-convex hydrofoils are presented. A linearized cavity\nflow theory with cavitation separation points determined from the assumption of smooth separation at the detachment point is presented and a comparison is made of these theoretical results with the experiments.\nScaling problems with cavitation separation from smooth\nslender bodies are discussed. With the help of photographic studies three different types of cavitation separation from smooth bodies are proposed.", "publisher": "California Institute of Technology", "publication_date": "1971-01" } ]