Orientation Effects in Two-Phase Microgap FlowSource: Journal of Electronic Packaging:;2019:;volume( 141 ):;issue: 003::page 31009DOI: 10.1115/1.4043483Publisher: American Society of Mechanical Engineers (ASME)
Abstract: The high power density of emerging electronic devices is driving the transition from remote cooling, which relies on conduction and spreading, to embedded cooling, which extracts dissipated heat on-site. Two-phase microgap coolers employ the forced flow of dielectric fluids undergoing phase change in a heated channel within or between devices. Such coolers must work reliably in all orientations for a variety of applications (e.g., vehicle-based equipment), as well as in microgravity and high-g for aerospace applications, but the lack of acceptable models and correlations for orientation- and gravity-independent operation has limited their use. Reliable criteria for achieving orientation- and gravity-independent flow boiling would enable emerging systems to exploit this thermal management technique and streamline the technology development process. As a first step toward understanding the effect of gravity in two-phase microgap flow and transport, in the present effort the authors have studied the effect of evaporator orientation, mass flux, and heat flux on flow boiling of HFE7100 in a 1.01 mm tall × 13.0 mm wide × 12.7 mm long microgap channel. Orientation-independence, defined as achieving similar critical heat fluxes (CHFs), heat transfer coefficients (HTCs), and flow regimes across orientations, was achieved for mass fluxes of 400 kg/m2 s and greater (corresponding to a Froude number of about 0.8). The present results are compared to published criteria for achieving orientation- and gravity-independence.
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contributor author | Robinson, Franklin L. | |
contributor author | Bar-Cohen, Avram | |
date accessioned | 2019-09-18T09:08:10Z | |
date available | 2019-09-18T09:08:10Z | |
date copyright | 5/17/2019 12:00:00 AM | |
date issued | 2019 | |
identifier issn | 1043-7398 | |
identifier other | ep_141_03_031009 | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4259271 | |
description abstract | The high power density of emerging electronic devices is driving the transition from remote cooling, which relies on conduction and spreading, to embedded cooling, which extracts dissipated heat on-site. Two-phase microgap coolers employ the forced flow of dielectric fluids undergoing phase change in a heated channel within or between devices. Such coolers must work reliably in all orientations for a variety of applications (e.g., vehicle-based equipment), as well as in microgravity and high-g for aerospace applications, but the lack of acceptable models and correlations for orientation- and gravity-independent operation has limited their use. Reliable criteria for achieving orientation- and gravity-independent flow boiling would enable emerging systems to exploit this thermal management technique and streamline the technology development process. As a first step toward understanding the effect of gravity in two-phase microgap flow and transport, in the present effort the authors have studied the effect of evaporator orientation, mass flux, and heat flux on flow boiling of HFE7100 in a 1.01 mm tall × 13.0 mm wide × 12.7 mm long microgap channel. Orientation-independence, defined as achieving similar critical heat fluxes (CHFs), heat transfer coefficients (HTCs), and flow regimes across orientations, was achieved for mass fluxes of 400 kg/m2 s and greater (corresponding to a Froude number of about 0.8). The present results are compared to published criteria for achieving orientation- and gravity-independence. | |
publisher | American Society of Mechanical Engineers (ASME) | |
title | Orientation Effects in Two-Phase Microgap Flow | |
type | Journal Paper | |
journal volume | 141 | |
journal issue | 3 | |
journal title | Journal of Electronic Packaging | |
identifier doi | 10.1115/1.4043483 | |
journal fristpage | 31009 | |
journal lastpage | 031009-12 | |
tree | Journal of Electronic Packaging:;2019:;volume( 141 ):;issue: 003 | |
contenttype | Fulltext |