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The Circular Hydraulic Jump in MicrogravityThis report summarizes the key experimental results and observations that were obtained under NASA grant NAG 3-1627 from the Fluid Physics Program. The Principle Investigator was Thomas Avedisian. In addition a half-time post-doctoral associate, Ziqun Zhao, was funded for half year. The project monitor was David Chao of the NASA-Lewis Research Center in Cleveland, Ohio. The grant period was originally for one year at $34K and a no-cost extension was applied for and granted for an additional year. The research consisted of an experimental study of the circular hydraulic jump (CHJ) in microgravity using water as the working fluid. The evolution of the CHJ radius was measured during a sudden transition from normal to microgravity in a drop tower. The downstream height of the CHJ was controlled by submerging the target plate in a tank filled with water to the desired depth, and the measurements are compared with an existing theory for the location of the CHJ. Results show that the CHJ diameter is larger in microgravity than normal gravity. The adjustment of the CHJ diameter to a sudden change in gravity occurs over a period of about 200ms for the conditions of the present study, and remains constant thereafter for most of the flow conditions examined. For flow conditions that a CHJ was not first established at normal gravity but which later appeared during the transition tb microgravity, the CHJ diameter was not constant during the period of microgravity but continually changed. Good agreement between measured and predicted CHJ radii is found for normal gravity CHJ radii, but comparatively poorer agreement is observed for the CHJ radii measurements in microgravity.
Document ID
19980048927
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Avedisian, C. Thomas
(Cornell Univ. Ithaca, NY United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1996
Subject Category
Materials Processing
Report/Patent Number
NASA/CR-96-207909
NAS 1.26:207909
Funding Number(s)
CONTRACT_GRANT: NAG3-1627
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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