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Effect of Variable Gravity on Evaporation of Binary Fluids in a Capillary Pore EvaporatorThe research project focuses on experimental investigation of the capillary-pumped evaporative heat transfer phenomenon. The objective is to examine whether the heat transfer and stability of a heated meniscus in a capillary pore can be enhanced by adding trace amounts of a non-volatile solute to a solvent and to understand the changes that occur. The experimental setup consists of a single pore evaporator connected to a reservoir which supplies liquid to the evaporator. In addition to the experiments of capillary-pumped evaporation, a parallel experimental study has been conducted to systematically investigate the effects of gravity as well as the effects of bulk composition on the heat transfer characteristics of evaporating binary thin films near the contact line region along an inclined heated surface. To investigate the buoyancy effects on evaporation along an inclined heated surface, the angle of inclination from a horizontal plane was varied fro 15 C to 90 C. An optimum concentration between 0.5% and 1% decane in pentane/decane solutions has been demonstrated at different angles of inclination. Improved heat transfer was found for the geometry with the smallest angle of inclination of 15 degrees. In addition, flow visualization has revealed that at low inclination angles effective heat transfer takes place primarily due to an extension of the thin film near the contact line. At these low inclination angles, the optimum concentration is associated with enhanced wetting characteristics and reduced thermocapillary stresses along the interface.
Document ID
19960052299
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Girgis, Morris M.
(Central State Univ. Wilberforce, OH United States)
Matta, Nabil S.
(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)
Bain, James, Jr.
(Central State Univ. Wilberforce, OH United States)
McGown, Juantonio
(Central State Univ. Wilberforce, OH United States)
Date Acquired
August 17, 2013
Publication Date
July 1, 1996
Publication Information
Publication: HBCUs Research Conference Agenda and Abstracts
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
Paper-3
Accession Number
96N35496
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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