Thermal-Fluid Study of Jet-in-Crossflow Cooling in Comparison with Pure Jet Impingement and Pure Crossflow Cooling Methods Applicable in Hotspot Treatment

Cooling of electronics devices while targeting the localized hotspots on them is one of the important challenges in developing modern computational systems. In this work, the thermal fluid characteristics of combined air jet impingement and cross flow cooling are numerically investigated and compared with thermal fluid characteristics of pure jet impingement and pure cross flow through a channel. The comparisons are performed at similar overall coolant mass flow rate and similar jet velocity. The cooling channel is subject to the applied heat flux on its side, representing the heat dissipated form an electronics device. There is a hotspot zone on the heated surface subject to a higher heat flux value. For data analysis, non-dimensional temperature distribution on the heated surface is presented and discussed for six studied cases. Also, a standard deviation term is used to quantify the temperature uniformity of the heated surface for each case. The grid independence study and validation study are conducted to ensure the accuracy of the results. It is found that jet-in-crossflow setup significantly decreases the surface temperature and temperature standard deviation as compared to pure crossflow cases at the same mass flow rate or similar velocity. In comparing jet-in-crossflow cases with pure jet impingement cases, it is found that a proper selection of jet location and jet angle in jet-in-crossflow setup yields a lower temperature standard deviation value and required pumping power than a pure jet impingement case, operating at the same jet velocity. In addition, at the same mass flow rate, the pressure drop and required pumping power for jet-in-cross flow cases are considerably less than those of pure jet impingement. In comparing temperature standard deviation values, a proper selection of jet location and jet angle in jet-in-crossflow setup produces a very close temperature standard deviation value to that of a pure jet impingement case operating at the same mass flow rate.