Abstract
ABSTRACT Thermal switches are a type of heat control devices widely used in electronics, engineering machinery, and other applications. Electrostatically driven thermal switches (EDTS) have received wide attention due to their high specific mass density, precise control of heat flow, and flexibility. However, most of the actuating components of EDTS are made of polymers with a poor thermal conductivity, which seriously affects the effectiveness of the thermal switch. This paper presents a highly efficient, reliable, and easy-to-implement EDTS with a mini-channel cooling, which combines the convective cooling with the electrostatic actuation by adding a cooling module to the radiator. The proposed EDTS controls its ON/OFF state using the electric field, and the water is used as the cooling fluid for absorbing the heat generated from the heat source. The experimental results demonstrated that the proposed EDTS achieves a switch ratio of 2964 ± 135 and a coefficient of performance (COP) of 11.6, indicating that it can effectively regulate the heat flow in the hot path. It demonstrates the prospect of becoming widely used in the thermal management of engineering machinery and electronic devices.
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