Effects of thermal dispersion on heat transfer in cross-flow tubular heat exchangers |
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| Authors: | Y Sano F Kuwahara M Mobedi A Nakayama |
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| Institution: | (1) Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan;(2) Department of Mechanical Engineering, Izmir Institute of Technology, Urla, 35430, Turkey;(3) Department of Civil Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China; |
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| Abstract: | Effects of thermal dispersion on heat transfer and temperature field within cross-flow tubular heat exchangers are investigated
both analytically and numerically, exploiting the volume averaging theory in porous media. Thermal dispersion caused by fluid
mixing due to the presence of the obstacles plays an important role in enhancing heat transfer. Therefore, it must be taken
into account for accurate estimations of the exit temperature and total heat transfer rate. It is shown that the thermal dispersion
coefficient is inversely proportional to the interstitial heat transfer coefficient. The present analysis reveals that conventional
estimations without consideration of the thermal dispersion result in errors in the fluid temperature development and underestimation
of the total heat transfer rate. |
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