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|標題:||Heat transfer characteristics of a helical heat exchanger||作者:||San, J.Y.
|關鍵字:||Helical heat exchanger;Effectiveness;Darcy friction factor;Nusselt;number;pressure-drop;performance;number;fluid;fin||Project:||Applied Thermal Engineering||期刊/報告no：:||Applied Thermal Engineering, Volume 39, Page(s) 114-120.||摘要:||
Heat transfer performance of a helical heat exchanger was investigated. The heat exchanger is composed of a helical tube with rectangular cross section and two cover plates. The epsilon-Ntu relation of the heat exchanger was obtained using a numerical method. In the analysis, the flow in the tube (helical flow) was considered to be mixed and the flow outside the tube (radial flow) was unmixed. In the experiment, the Darcy friction factor (f) and convective heat transfer coefficient (h) of the radial flow were measured. The radial flow was air and the helical flow was water. Four different channel spacing (0.5, 0.8, 1.2 and 1.6 mm) were individually considered. The Reynolds numbers were in the range 307-2547. Two correlations, one for the Darcy friction factor and the other for the Nusselt number, were proposed. (C) 2012 Elsevier Ltd. All rights reserved.
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