Abstract
This paper takes the heat dissipation problem of linear Fresnel concentrating photovoltaic devices as the research background, this paper conducts an experimental investigation on the boiling flow characteristics of the dielectric liquid R141b, and discusses the enhancement effect of the electric field on the foam metal porous wall microchannel heat sink. In this paper, the effects of electric field strength (applied voltage) on wall temperature, heat transfer coefficient and critical heat flux (CHF) of mini-channel heat sink are investigated. The bubble departure diameter and incipience location in the mini-channel heat sink under different electric field strengths are recorded using a high-speed camera. Combined with the theory of electrohydrodynamic (EHD), the behavior of bubbles appearing in mini-channel heat sink under the action of electric field is analyzed. It is observed by visualization that the number of bubbles in the channel increases and the volume of bubbles becomes smaller under the electric field force. Research shows that when the voltage is 200V, the heat transfer coefficient of the mini-channel heat sink increases by a maximum of 178%, and the critical heat flux can be increased by a maximum of 123%. As the applied voltage increases, the wall temperature decreases.
Published Version
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