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A microgravity boiling and convective condensation experimentA boiling and condensing test article consisting of two straight tube boilers, one quartz and one stainless steel, and two 1.5 m long glass-in-glass heat exchangers, on 6 mm ID and one 10 mm ID, was flown on the NASA KC-135 0-G aircraft. Using water as the working fluid, the 5 kw boiler produces two phase mixtures of varying quality for mass flow rates between 0.005 and 0.1 kg/sec. The test section is instrumented at eight locations with absolute and differential pressure transducers and thermocouples. A gamma densitometer is used to measure void fraction, and high speed photography records the flow regimes. A three axis accelerometer provides aircraft acceleration data (+ or - 0.01G). Data are collected via an analog-to-digital conversion and data acquisition system. Bubbly, annular, and slug flow regimes were observed in the test section under microgravity conditions. Flow oscillations were observed for some operating conditions and the effect of the 2-G pullout prior to the 0-G period was observed by continuously recording data throughout the parabolas. A total fo 300 parabolas was flown.
Document ID
19880064113
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kachnik, Leo
(Texas A&M Univ. College Station, TX, United States)
Lee, Doojeong
(Texas A&M Univ. College Station, TX, United States)
Best, Frederick
(Texas A & M University College Station, United States)
Faget, Nanette
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ASME PAPER 87-WA/HT-12
Accession Number
88A51340
Distribution Limits
Public
Copyright
Other

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