Title:Thermal Slip Length at a Liquid/Solid Interface: Power Law Relations From Spatial and Frequency Attributes of the Contact Layer

Abstract:Specialty integrated chips for power intensive tasks like artificial intelligence generate so much heat that data centers are switching to liquid cooling to prevent malfunction. A critical factor hindering optimization of the thermal flux across the liquid/solid (L/S) interface is the lack of any predictive model for the thermal slip length at non-cryogenic temperatures. An extensive study using non-equilibrium molecular dynamics simulations reveals distinct power law relations governing this length scale which incorporate the influence of local temperature, in-plane translational order and vibrational frequency of the liquid contact layer and adjoining solid layer. Similar relations are expected to hold for other L/S systems modeled by the Lennard-Jones potential given the principle of corresponding states.