Heat transfer and pressure drop correlations for direct on-chip microscale jet impingement cooling with alternating feeding and draining jets

Abstract

Jet impingement cooling with distributed outlet configuration is regarded as an efficient cooling solution for high performance systems. This work develops the Nusselt number (Nu) over bar (f) - Re-d and pressure drop k-factor correlations for microscale multi-jet impingement cooling with alternating feeding and draining jets. An extensive design of experiments (DOE) of unit cell modeling-based simulations is used for the correlation fitting. In order to understand the flow and thermal behavior, the impact of single variables including the inlet diameter, outlet diameter, jet-to-target distance and nozzle length is studied systematically. On the other hand, this work firstly shows the predictive model with k - Re-d, including the impact of nozzle length t/L, cavity height H/L and inlet diameter ratio d(i)/L. Finally, the extracted correlations are experimentally validated, both with experimental data of different jet impingement demonstrators, as well as with the literature experimental data. (c) 2021 Elsevier Ltd. All rights reserved.