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>Experimental study of turbulent flow heat transfer and pressure drop in a plate heat exchanger with chevron plates
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Experimental study of turbulent flow heat transfer and pressure drop in a plate heat exchanger with chevron plates
Experimental data for isothermal pressure drop and heat transfer in single-phase water flows in a plate heat exchanger (PHE) with chevron plates are presented. A single-pass, U-type, counterflow PHE, with three different chevron plate arrangements is employed: two symmetric plate arrangements with beta chemical bounds 30 deg /30 deg and 60 deg /60 deg, and a mixed-plate arrangement with beta beta chemical bounds 30 deg /60 deg . With water flow rates in the turbulent flow regime (600 < Re < 10~4 and 2 < Pr < 6), effects of the chevron corrugation inclination angle beta on Nu and f characteristics of the PHE are investigated As beta increases and compared to a flat-plate pack, up to 2 to 5 times higher Nu are obtained; the concomitant f, however, are 13 to 44 times higher. Based on the experimental data for Re >= 1000, predictive correlations of the form Nu chemical bounds C_1(beta) Re~((p1)(beta)) Pr~(1/3) (mu / mu_w)~(0.14) and f chemical bounds C_2 (beta) Re~(p2(beta)) are devised. Also, at constant pumping power and depending upon beta, the heat transfer is found to be enhanced over 1.8 times that in equivalent flat-plate channels.
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