This article investigates the phase‐change of nanoscale liquid films on different wettability surfaces via molecular dynamics simulation, analyzes the thermal resistance between solid and liquid, investigates the thermal resistance at the solid‐liquid interface and studies the mismatch between the vibrational density of states of the solid and liquid for different wettability surfaces. The results show that a liquid region of 1.4 g/cm³ mass density always exists on the hydrophilic surface during phase‐change, whereas a liquid‐vapor‐liked region of 0.7–0.8 g/cm³ mass density exists on the hydrophobic surface. The thermal resistance at the solid‐liquid interface of the hydrophilic surface is less than that of the hydrophobic surface. The reason is that the mismatch between the vibrational density of states of the solid and liquid of the hydrophilic surface is less than that of the hydrophobic surface.

As the heat flux of electronic components is increasing rapidly, the traditional air-cooling technique is gradually not meeting the requirements of thermal management. The immersion liquid-cooling technique shows great potential, and has attracted increasing attention due to its excellent performance in recent years. The finned heat sink is common and essential for cooling electric components. To analyze the influences of its structural parameters on heat dissipation and improve its efficiency while using a dielectric coolant, this study used the orthogonal analysis method to obtain the optimal structure via the numerical simulation method. The maximum temperature of the heat sink was selected as the evaluation criteria. The results showed that the parameters that affect the maximum temperature, in order of importance, are fin thickness, the number of fins, the height of the fins, and substrate thickness. Finally, taking the maximum temperature and mass as indexes obtained the optimal structure of the heat sink. The mass was reduced by 19%, while the temperature only increased by 4.5% when considering the mass index.

Recently, thanks to its excellent opto-electronic properties, two-dimension topological insulator not only has attracted broad interest in fields such as tunable detectors and nano-electronics but also shall yield more interesting prospect in thermal management, energy conversion, and so on. In this work, the excellent near-filed radiative heat transfer (NFRHT) resulting from monolayer topological insulator (Bi₂Se₃) is demonstrated. The NFRHT of this system is mainly dominated by the strong coupling effect of the surface plasmon polaritons (SPPs) between two Bi₂Se₃ sheets. Moreover, the non-monotonic dependence of the Fermi energy of Bi₂Se₃ on NFRHT is then discovered. It is indicated that the system can provide great thermal adjustability by controlling the Fermi energy, achieving a modulation factor of heat flux as high as 98.94%. Finally, the effect of substrate on the NFRHT is also explored. This work provides a promising pathway for the highly efficient thermal management.