Enhanced heat transfer characteristics using dimples in the receiving end of laser wireless power transmission system

Laser wireless power transmission is a method of transmitting energy using laser as the carrier and photovoltaic cell as the receiving end. The study of cooling of its receiving end is significant, which can improve the efficiency and extend the service life of the system. In this article, dimples and protrusions with different heights are designed as heat dissipation components, which is the first application to laser wireless power transmission. And numerical simulations are conducted using the standard k-ω model to analyze and compare the heat transfer characteristics and electrical characteristics of photovoltaic cooling system under different geometric parameters. The results show that, under the same flow rate, the backside temperature of the cells with dimples and protrusions packs is 1 ∼ 3 K lower and the average Nusselt number increases by 30 %∼54 % compared to that of the smooth flat plate. At the same geometric parameters of the heat sinks and the Reynolds numbers of 7207, 14413, and 28106, the power peaks are increased by 15.3, 16.7and 17.7 times compared to that of the cells without the heat sinks.