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Performance Assessment of Single and Multiple Jet Impingement Configurations in a Refrigeration-based Compact Heat Sink for Electronics Cooling

[+] Author and Article Information
Pablo Oliveira

POLO - Research Laboratories for Emerging Technologies in Cooling and Thermophysics Department of Mechanical Engineering, Federal University of Santa Catarina Florianopolis, SC, 88040-900, Brazil
pablo_oliveira@polo.ufsc.br

Jader Riso Barbosa Jr

POLO - Research Laboratories for Emerging Technologies in Cooling and Thermophysics Department of Mechanical Engineering, Federal University of Santa Catarina Florianopolis, SC, 88040-900, Brazil
jrb@polo.ufsc.br

1Corresponding author.

ASME doi:10.1115/1.4036817 History: Received January 25, 2017; Revised April 24, 2017

Abstract

The performance of a novel impinging two-phase jet heat sink operating with single and multiple jets is presented and the influence of the following parameters is quantified: (i) thermal load applied on the heat sink, (ii) number of orifices and (iii) geometrical arrangement of the orifices (jets). The heat sink is part of a vapor compression cooling system equipped with a R-134a small-scale oil-free linear motor compressor and it integrates the evaporator and the expansion device into a single cooling unit. The expansion device can be a single orifice or an array of orifices responsible for the generation of two-phase jet(s) impinging on a surface with a highly concentrated heat load. The analysis is based on thermodynamic performance metrics and steady-state heat transfer parameters associated with the impinging jet(s) for single and multiple orifice tests. The two-phase jet heat sink was capable of dissipating cooling loads of up to 160 W and 200 W from a 6.36-cm2 surface for single and multiple orifice configurations, respectively. For these cases, the temperature of the impingement surface was kept below 40oC and the average heat transfer coefficient reached values between 14,000 and 16,000 W/(m2K).

Copyright (c) 2017 by ASME
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