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Plume backscatter measurements using quartz crystal microbalances in JPL Molsink (molecular sink)Quantitative evidence of gas flows in the far upstream region of small nozzles with large boundary layer flow are discussed. Gas mass fluxes were measured using quartz crystal microbalances. Both nitrogen and carbon dioxide gases were used as test gases. Gas deposition rates on the order of 100 monolayers per minute were detected 13 inches upstream of the nozzle exit plane. It is significant to note that the crystals detected gases considerably beyond the Prandtl-Meyer turning angle. The data from these tests will be essential in the formulation of scaling laws and analytical prediction methods for viscous plume behavior.
Document ID
19720017659
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Simon, W. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 2, 2013
Publication Date
May 15, 1972
Subject Category
Fluid Mechanics
Report/Patent Number
JPL-TM-33-540
NASA-CR-126967
Accession Number
72N25309
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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