Performance of Counterflow,Parallel Plate Heat Exchangers under Laminar Flow Conditions |
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Authors: | SHIGERU MORI MASAHIRO KATAYA AKIRA TANIMOTO |
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Affiliation: | Department of Chemical Engineering , Kanazawa University , Kodatsuno, Kanazawa, 920, Japan |
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Abstract: | Multilayered heat exchangers were analyzed theoretically and their heat transfer characteristics were clarified. The problem was treated as a two-dimensional, conjugated one with three phases-two fully developed laminar flows and the exchanger wall. From numerical results, the exchanger effectiveness was found to be definitely influenced by the following parameters: Graetz number, heat capacity flow rate ratio, dimensionless wall thickness, and conductance ratios between fluid and wall and between both fluids. Examination of mixed-mean temperature distributions in the exchanger showed that longitudinal wall conduction significantly reduces exchanger effectiveness in the low-Graetz-number region. Experimental results were in fairly good agreement with theoretical predictions. |
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