ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
EFFECTS OF TURBULENCE PARAMETERS ON HEAT TRANSFER OF CROSS FLOW HEAT EXCHANGERS
Abstract
Experimental data are presented indicating effects of streamwise turbulence intensity and streamwise integral length scale of gas side inlet free stream turbulence on heat transfer from liquid-to-gas heat exchangers for passage Reynolds numbers from 600 to 8,000. The inlet turbulence intensity was varied from 0.2 percent to 16 percent and the integral length scale from 0.005 m to 0.025 m. Experiments were conducted for heat exchangers with nominal gas side flow lengths from 0.033 m to 0.152 m and fin densities from 157.5 to 551 fins per meter. Results are given for plate fins with both staggered and in-line tubes and for one type of louvered fin. It is concluded, for the ranges covered, that augmentation of heat transfer coefficients occurs due to increased turbulence intensity; however, the effect of integral length scale is small. Comparison of results with the literature is included.