Characterization of thermal boundary resistance at solid-liquid interface based on continuous wave frequency domain thermal reflection method

Thermal transport properties of the solid-liquid interface continue to be in urgent research need with the widespread use of nanoscale fluid cooling, particle-assisted therapy, and lubrication technologies. In this paper, we developed an experimental system of Continuous wave frequency domain thermal reflection for measuring the thermal conductivity of liquids and interfacial thermal conductance of the solid-liquid and a two-way heat transport model based on the transmission line theory model, and the thermal conductivity, the interfacial thermal conductance and the contact angle of liquids on the surface of the aluminum sensing layer were measured for water, ethanol and hexadecane. In addition, we simulated the thermal transport at the Al /water interface by molecular dynamics with simulation results agreeing with experimental results. The results show that solid/liquid interface thermal transport depends on the transverse mode coupling of liquid wettability, increase the force interaction between solid and liquid molecules which couples the energy of low-frequency phonons to the liquid, thus making the interfacial thermal conductance decrease.