Numerical study of jet impingement subcooled boiling on superheated surfaces

Abstract

Cooling techniques for superheated surfaces by jet. impingement, taking advantage of phase change phenomenon, i.e., boiling heat transfer, have been proven to be an efficient method because of' their high rate of' heat transfer. Furthermore, at a specified heat transfer coefficient, the flow required for cooling purposes can decrease by two orders of' magnitude in comparison with the free-wall parallel flow, which is significant, in terms of energy and water sustainability issues in various industries. This research is mainly concerned with numerical simulation of hydrodynamics and heat transfer phenomena regarding phase-change jet impingement on nucleate boiling region. Rensselaer Polytechnic Institute wall boiling model, based on Eulerian multiphase model, and RNG k-e turbulence model were employed. Each inter facial term was considered and selected based on proximity to real physical phenomena. The selected model in this research was validated by a previously performed confined jet impingement subcooled boiling experiment (dielectric fluid-PF5060). Minimum error of 4% and maximum error of 15% were reached at stagnation point. In the parametric study, the effect of jet Reynolds number based on nozzle hydraulic diameter at Re values of' 2500 to 10000 and the effect of standoff distance of jet nozzle from target surface at H/D values of 2, 4, and 0 were investigated. @ 2019 Sharif University of Technology. All rights reserved.