HEAT TRANSFER DURING POOL BOILING OF WATER ON FINNED SURFACES USING ADIABATIC INSERTS
P.G. Bobylev, A.V. Pavlov, S.V. Andreiko, V.Yu. Mityakov, S.Z. Sapozhnikov
Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg, Russia
Keywords: immersion cooling system, heat flux density, flow control, gradient heatmetry, power electronics, two-phase cooling system
Abstract
A method for controlling the heat flux density during boiling of water in the context of modeling a two-phase cooling system for power electronics is examined. The challenge of increasing thermal loads and amplifying power devices lies in the inability to remove such high heat fluxes from the power module. The most efficient heat removal mechanism, boiling, is limited by the onset of a boiling crisis. A simplified method for enhancing vapor removal from the heat transfer surface using adiabatic inserts is proposed. The inserts break up vapor bubbles into smaller ones, reducing the likelihood of vapor film formation on the surface. Additionally, they promote liquid sliding along the unheated isothermal insert wall, unimpeded by vapor bubbles. The primary experimental technique is gradient heatmetry. The dependence of the local heat flux density on the simulated power module temperature is obtained for various fin pitches with adiabatic inserts. The effectiveness of the proposed heat flux density control method is demonstrated.
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