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Characterization of particles in the Langley 0.3 meter transonic cryogenic tunnel using hot wire anemometryHot wire anemometry was used to identify the nature of particles reportedly observed during free stream velocity measurements in the Langley 0.3-meter transonic cryogenic tunnel using a Laser Doppler Velocimeter. Since the heat-transfer process from the hot wire depends on the thermal conductivity and sticking capability of the particles, it was anticipated that the hot wire anemometer response would be affected differently upon impaction by liquid droplets and solid aerosols in the test gas stream. Based on the measured time response of the hot-wire anemometer in the cryogenic tunnel operated in the 0.3-0.8 Mach number range, it is concluded that the particles impacting the hot wire are liquid in nature rather than solid aerosols. It is further surmised that the liquid aerosols are unevaporated liquid nitrogen droplets used for cooling the tunnel test gas.
Document ID
19830002137
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Singh, J. J.
(NASA Langley Research Center Hampton, VA, United States)
Marple, C. G.
(NASA Langley Research Center Hampton, VA, United States)
Davis, W. T.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1982
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:84551
NASA-TM-84551
Accession Number
83N10407
Funding Number(s)
PROJECT: RTOP 307-01-02-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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