An experimental investigation on fluid flow and heat transfer of rough mini-channel with rectangular cross section

摘要

In this study, experimental investigation has been conducted on fluid flow and heat transfer of rough mini-channels with rectangular cross sections. The mini-channel considered consists of twelve identical rectangular channels with 4 mm width, 8 mm height, and 80 mm length. Air is employed as the working fluid with Reynolds number varied from 1500 to 5000. Four mini-channels were examined with different values of relative surface roughness (epsilon) 1.6 * 10(-4), 3.45 *10(-4), 6.15 * 10(-4), and 10.5 *10(-4). The friction factor (I), average Nusselt number (Nu), pressure drop penalty factor (E-f), heat transfer enhancement factor (E-hh), and universal evaluation parameter (PEC) were evaluated to study fluid flow and heat transfer of rough mini-channels with rectangular cross sections.