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Title: Microchannel membrane separation applied to confined thin film desorption

Abstract

The concept of a confined thin film to enhance the desorption process is based on a reduced mass diffusion resistance. A wide thin film is formed into a microchannel by using a porous membrane as one wall of the channel enabling vapor extraction along the flow. Heat added to the channel results in vapor generation and subsequent extraction through the membrane. This experimental study investigates the performance of vapor extraction as a function of confined thin film thickness, pressure difference across the membrane and inlet concentration to the microchannel. In addition, heat added to the system was varied and results are presented in terms of the wall superheat temperature relative to the inlet saturated conditions of the binary fluid. The test section was equipped with a transparent window to observe bubble formation and vapor extraction. Results show that the performance, measured by the vapor release rate, increases for reduced channel thickness, for increased pressure difference across the membrane, and for lower inlet concentration. Results show that lower wall superheat correspond to higher heat transfer coefficients. Trends of Nusselt number and Sherwood number versus both channel Reynolds number and the product of the Reynolds number and Schmidt number are presented. Bubblemore » formation in the channel does not degrade overall performance provided a critical heat flux condition does not occur. (author)« less

Authors:
; ;  [1]
  1. Department of Mechanical Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331 6001 (United States)
Publication Date:
OSTI Identifier:
20770231
Resource Type:
Journal Article
Journal Name:
Experimental Thermal and Fluid Science
Additional Journal Information:
Journal Volume: 30; Journal Issue: 8; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0894-1777
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; HEAT PUMPS; DESORPTION; ABSORPTION; LITHIUM BROMIDES; WATER; MEMBRANES; POROUS MATERIALS; THIN FILMS; VAPOR SEPARATORS; PERFORMANCE; PRESSURE DEPENDENCE; THICKNESS; BUBBLES; NUSSELT NUMBER; REYNOLDS NUMBER

Citation Formats

Thorud, Jonathan D, Liburdy, James A, and Pence, Deborah V. Microchannel membrane separation applied to confined thin film desorption. United States: N. p., 2006. Web. doi:10.1016/j.expthermflusci.2006.03.001.
Thorud, Jonathan D, Liburdy, James A, & Pence, Deborah V. Microchannel membrane separation applied to confined thin film desorption. United States. https://doi.org/10.1016/j.expthermflusci.2006.03.001
Thorud, Jonathan D, Liburdy, James A, and Pence, Deborah V. 2006. "Microchannel membrane separation applied to confined thin film desorption". United States. https://doi.org/10.1016/j.expthermflusci.2006.03.001.
@article{osti_20770231,
title = {Microchannel membrane separation applied to confined thin film desorption},
author = {Thorud, Jonathan D and Liburdy, James A and Pence, Deborah V},
abstractNote = {The concept of a confined thin film to enhance the desorption process is based on a reduced mass diffusion resistance. A wide thin film is formed into a microchannel by using a porous membrane as one wall of the channel enabling vapor extraction along the flow. Heat added to the channel results in vapor generation and subsequent extraction through the membrane. This experimental study investigates the performance of vapor extraction as a function of confined thin film thickness, pressure difference across the membrane and inlet concentration to the microchannel. In addition, heat added to the system was varied and results are presented in terms of the wall superheat temperature relative to the inlet saturated conditions of the binary fluid. The test section was equipped with a transparent window to observe bubble formation and vapor extraction. Results show that the performance, measured by the vapor release rate, increases for reduced channel thickness, for increased pressure difference across the membrane, and for lower inlet concentration. Results show that lower wall superheat correspond to higher heat transfer coefficients. Trends of Nusselt number and Sherwood number versus both channel Reynolds number and the product of the Reynolds number and Schmidt number are presented. Bubble formation in the channel does not degrade overall performance provided a critical heat flux condition does not occur. (author)},
doi = {10.1016/j.expthermflusci.2006.03.001},
url = {https://www.osti.gov/biblio/20770231}, journal = {Experimental Thermal and Fluid Science},
issn = {0894-1777},
number = 8,
volume = 30,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2006},
month = {Tue Aug 15 00:00:00 EDT 2006}
}