An experimental study on absorption characteristics of water vapor into a thin lithium-bromide (LiBr) solution flow is presented. The LiBr solution flow is constrained between a superhydrophobic vapor-permeable wall and a solid surface that removes the heat of absorption. As opposed to conventional falling film absorbers, in this configuration, the solution film thickness and velocity can be controlled independently to enhance the absorption rate. The effects of water vapor pressure and cooling surface temperature on the absorption rate are studied. An absorption rate of approximately 0.005 kg/m2s was measured at a LiBr solution channel thickness and flow velocity of 160 μm and 4 mm/s, respectively. The absorption rate increased linearly with the water vapor driving potential at the tested solution channel thickness. The high absorption rate and the inherently compact form of the proposed absorber promise compact small-scale waste heat or solar-thermal driven cooling systems.
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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
Absorption Characteristics of Thin Lithium Bromide (LiBr) Solution Film Constrained by a Porous Hydrophobic Membrane
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:
ICNMM2013-73158, V001T08A002; 6 pages
Published Online:
December 4, 2013
Citation
Nasr Isfahani, R, & Moghaddam, S. "Absorption Characteristics of Thin Lithium Bromide (LiBr) Solution Film Constrained by a Porous Hydrophobic Membrane." 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. V001T08A002. ASME. https://doi.org/10.1115/ICNMM2013-73158
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