This study investigates the physics of water desorption from a lithium bromide (LiBr) solution film. The study was conducted on a membrane-based desorber in which the solution flows through an array of microchannels capped by a porous membrane. The membrane allows the vapor to exit the flow and retains the liquid. The solution film velocity and thickness as well as the solution and vapor pressures are independently controlled. Effects of different parameters such as wall temperature, solution and vapor pressures, solution flow velocity, and the solution inlet temperature on desorption rate were studied. Two different mechanisms of desorption are observed and analyzed. These mechanisms consisted of: (1) direct diffusion of water molecules out of the solution and their subsequent flow through the membrane and (2) formation of water vapor bubbles within the solution and their exit through the membrane. Direct diffusion was the dominant desorption mode at low surface temperatures and its magnitude was directly related to the vapor pressure, the solution concentration, and the heated wall temperature. Desorption at the boiling regime was predominantly controlled by the solution flow pressure. Overall, an order of magnitude higher desorption rate compare to a previous study on a membrane-based desorber was achieved.
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ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels
June 16–19, 2013
Sapporo, Japan
Conference Sponsors:
- Fluids Engineering Division
- Heat Transfer Division
ISBN:
978-0-7918-5559-1
PROCEEDINGS PAPER
Physics of Membrane-Based Phase Separation in Flow Boiling of a Binary Mixture
Rasool Nasr Isfahani,
Rasool Nasr Isfahani
University of Florida, Gainesville, FL
Search for other works by this author on:
Saeed Moghaddam
Saeed Moghaddam
University of Florida, Gainesville, FL
Search for other works by this author on:
Rasool Nasr Isfahani
University of Florida, Gainesville, FL
Saeed Moghaddam
University of Florida, Gainesville, FL
Paper No:
ICNMM2013-73076, V001T04A008; 7 pages
Published Online:
December 4, 2013
Citation
Nasr Isfahani, R, & Moghaddam, S. "Physics of Membrane-Based Phase Separation in Flow Boiling of a Binary Mixture." Proceedings of the ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. Sapporo, Japan. June 16–19, 2013. V001T04A008. ASME. https://doi.org/10.1115/ICNMM2013-73076
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