Measurement Of The Performances Of A
Transparent Closed Loop Two-phase
Thermosyphon
Author(s)
B. Agostini & M. Habert
Abstract
This paper presents measurements performed on a transparent gravity driven twophase
loop. For this purpose a small channel thermosyphon was manufactured
completely out of borosilicate glass and equipped with a 100 nm semi-transparent
ITO layer as a direct current heating evaporator. Thus flow patterns could be
observed in the evaporator and at the same time the total thermal resistance was
calculated with the heater temperature. Influence of heat flux and filling ratio on
the thermal resistance and pressure oscillations were investigated.
1 Introduction
Gravity driven two-phase loops (or thermosyphons) are very widespread devices
the nuclear industry, solar heating, computer cooling and chemical engineering,
but their use for thermal management of power electronics has been recognised
only lately. However, articles on this application are becoming more and more
frequent in the literature.
Thermosyphon heat-exchangers allow the use of dielectric fluids and pumpless
operation and still benefit from very high heat transfer coefficients. For example
Perpina et al [1] recently published an article investigating thermal cycles
of thermosyphon cooled traction IGBT modules. Thermosyphons using small
channels are particularly appealing for their compactness and low material and
fluid use.
Although few data are available with the new dielectric fluids at the required
working temperatures and channel diameters, available studies on different
thermosyphon configurations are helpful to outline some trends.
Keywords
Related Book
Other papers in this volume
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