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Development of a High‐Performance Boiling Heat Exchanger by Improved Liquid Supply to Narrow Channels
Author(s) -
OHTA HARUHIKO,
OHNO TOSHIYUKI,
HIOKI FUMIAKI,
SHINMOTO YASUHISA
Publication year - 2004
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1324.019
Subject(s) - critical heat flux , materials science , boiling , heat flux , mechanics , volumetric flow rate , heat exchanger , heat transfer , micro heat exchanger , capillary action , heat pipe , plate fin heat exchanger , thermodynamics , heat transfer coefficient , plate heat exchanger , chemistry , composite material , physics
A bstract : A two‐phase flow loop is a promising method for application to thermal management systems for large‐scale space platforms handling large amounts of energy. Boiling heat transfer reduces the size and weight of cold plates. The transportation of latent heat reduces the mass flow rate of working fluid and pump power. To develop compact heat exchangers for the removal of waste heat from electronic devices with high heat generation density, experiments on a method to increase the critical heat flux for a narrow heated channel between parallel heated and unheated plates were conducted. Fine grooves are machined on the heating surface in a transverse direction to the flow and liquid is supplied underneath flattened bubbles by the capillary pressure difference from auxiliary liquid channels separated by porous metal plates from the main heated channel. The critical heat flux values for the present heated channel structure are more than twice those for a flat surface at gap sizes 2 mm and 0.7 mm. The validity of the present structure with auxiliary liquid channels is confirmed by experiments in which the liquid supply to the grooves is interrupted. The increment in the critical heat flux compared to those for a flat surface takes a maximum value at a certain flow rate of liquid supply to the heated channel. The increment is expected to become larger when the length of the heated channel is increased and/or the gravity level is reduced.