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Indexed by:期刊论文

Date of Publication:2017-05-01

Journal:INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

Included Journals:SCIE、EI

Volume:108

Page Number:2198-2210

ISSN No.:0017-9310

Key Words:R124-DMAC mixture; Vertical tube; Bubble absorption; Heat transfer; Mass transfer

Abstract:Experimental investigation for a copper vertical tubular bubble absorber was done with R124 (2-chloro-1,1,1,2,-tetrafluoroethane)-DMAC (N',N'-dimethylacetamide) as working fluid. The objective of the investigation was to explore key parameters affecting heat and mass transfer characteristics of the bubble absorber and propose new correlations for heat and mass transfer coefficients respectively for the R124-DMAC bubble absorption. The parameters include vapor and solution flow rates, solution inlet temperatures and mass fractions, nozzle orifice diameters and cooling water inlet temperatures. The results showed that to reduce the solution, cooling water inlet temperature and nozzle orifice diameter or to increase vapor and solution flow rate could enhance the heat and mass transfer performance of the absorber. Finally, correlations of Nusselt number and Sherwood number for calculating heat and mass transfer coefficients were proposed, respectively. Both correlations could predict about 90% of the experimental values at a margin of error less than 20%. (C) 2017 Elsevier Ltd. All rights reserved.