Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7054791 | International Journal of Heat and Mass Transfer | 2018 | 14 Pages |
Abstract
Local temperature measurements were made in a microchannel jet impingement cooling system with a single slot jet (Dhâ¯=â¯68â¯Âµm and standoff distance of 210â¯Âµm). A 40%/60% solution of propylene glycol in deionized water was used as the working fluid. Resistance temperature detectors (RTDs) were fabricated over a rectangular heater of size 1500â¯Âµmâ¯Ãâ¯400â¯Âµm allowing local temperature measurements. Nominal heat fluxes ranged between 50â¯W/cm2 and 150â¯W/cm2, and jet Reynolds numbers were in the range of 122-435. A three-dimensional conduction/convection conjugated numerical model with laminar and turbulent variants was developed to predict the jet hydrodynamics and heat transfer process. Good agreement was achieved between the model and the experimental data in terms of flow coefficients and local wall temperatures. Furthermore, a generalized Nusselt number dependence on Reynolds number was formulated, taking into account the temperature-dependent viscosity of the working fluid. The results provide valuable information about local and surface-averaged heat transfer due to a flow field generated by an impinging micro slot jet.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Ashwin Kumar Vutha, Tomer Rozenfeld, Jeong-Heon Shin, Sameer Rao, Yingying Wang, Gennady Ziskind, Yoav Peles,