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Evaporation of binary mixtures in microgravityThe motivation of this research is to obtain a better understanding of phase-change heat transfer within single and binary liquid meniscii, both in 1-g and 0-g environments. During phase 1 and part of phase 2, in a glass test cell with an inclined heated plate, 1-6 experiments on pentane with additions of decane up to 3% were conducted to determine the optimum concentration that will exhibit the maximum heat transfer and stability. During phase 2 emphasis was given to explore fundamental research issues and to ultimately develop a reliable capillary pumped loop (CPL) device for low gravity. In related experimental work, it was found that thermocapillary stresses near the contract line could result in a degraded wettability which ultimately could explain the observed failure of CPL devices in zero-gravity environment. Therefore, the current experimental effort investigates the effect of adding binary constituents in improving the thermocapillary characteristics near the contact line within the loop configuration. Achievements during second phase include: (1) Further enhancement of Central State University's Microgravity Laboratory by adding or improving upon capabilities of photography, video imaging, fluid visualization, and general experimental testing capabilities; (2) Experimental results for the inclined plate cell; (3) Modeling effort with a detailed scaling analysis; (4) Additional testing with a tube loop configuration to extend experimental work by Dickens, et al.; (5) Fabrication of a capillary loop to be tested using binary fluid (pentane/decane). The device that has been recently completed will be set up horizontally so that the effect of gravity on the performance is negligible. Testing will cover a wide range of parameters such as decane/pentane concentration, heat input value, heat input location (below or above meniscus), and loop temperature.
Document ID
19960000387
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Girgis, Morris
(Central State Univ. Wilberforce, OH, United States)
Matta, Nabil
(Central State Univ. Wilberforce, OH, United States)
Kolli, Kiran
(Central State Univ. Wilberforce, OH, United States)
Brown, Leon
(Central State Univ. Wilberforce, OH, United States)
Chubb, Kevin
(Central State Univ. Wilberforce, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Publication Information
Publication: NASA. HBCUs Research Conference Agenda and Abastracts
Subject Category
Materials Processing
Accession Number
96N10387
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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