Thermal Transport at Solid–Liquid Interfaces: High Pressure Facilitates Heat Flow through Nonlocal Liquid Structuring

Abstract

The integration of three-dimensional microelectronics is hampered by overheating issues inherent to state-of-the-art integrated circuits. Fundamental understanding of heat transfer across soft-solid interfaces is important for developing efficient heat dissipation capabilities. At the microscopic scale, the formation of a dense liquid layer at the solid-liquid interface decreases the interfacial heat resistance. We show through molecular dynamics simulations of n-perfluorohexane on a generic wettable surface that enhancement of the liquid structure beyond a single adsorbed layer drastically enhances interfacial heat conductance. Pressure is used to control the extent of the liquid layer structure. The interfacial thermal conductance increases with pressure values up to 16.2 MPa at room temperature. Furthermore, it is shown that liquid structuring enhances the heat-transfer rate of high-energy lattice waves by broadening the transmission peaks in the heat flux spectrum. Our results show that pressure is an important external parameter that may be used to control interfacial heat conductance at solid-soft interfaces.

Enhanced thermal conductance at the graphene–water interface based on functionalized alkane chains

“…To provide a systematic study, a series of FG-water models were built with different alkane chain lengths and surface coverage for tunable interfacial thermal conductance. This work could provide new insights for applications such as self-assembled monolayers, 28 nanoscale microchannels, 29 microelectronics, 30 nanouids, 31 solar thermal steam generation 22 and biological cells. 19…”

Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach

“…The phonon density of states (DOS) of a system describes the proportion of states that are occupied by the system at each energy in the range of modes of vibrations of elastic arrangements of atoms or molecules. The phonons play an important role in the thermal conductivity across the interface between two phases or materials, so the study of this type of vibration mode gives a deep understanding of the influence of atomistic properties on a property such as this [ 26 , 27 ]. The DOS was computed by calculating the Fourier transformation of the atomic velocity autocorrelation functions [ 28 ]: where v (0) and v ( t ) are the velocities of each atom at initial time and time t , respectively, and ω is the frequency.…”

Effect of wall stiffness, mass and potential interaction strength on heat transfer characteristics of nanoscale-confined gas

“…Due to the cold wall nature of these methods, the above-mentioned simulations were limited to hydrodynamic properties and no heat transfer in the gas medium could be tackled [28,33]. A comprehensive literature review reveals that while the studies of heat transfer in a nanoconfined rarefied gas medium are restricted by the channel length in the periodic direction resulting enormous computational time, heat transfer in the nanoconfined liquid medium has been extensively studied considering appropriate wall/fluid interactions [34][35][36][37][38][39][40][41][42][43][44][45].…”