Molecular dynamics simulations of the liquid film evaporation heat transfer on different wettability hybrid surfaces at the nanoscale

Q Cao and W Shao and XH Ren and XT Ma and K Shao and Z Cui and Y Liu, JOURNAL OF MOLECULAR LIQUIDS, 314, 113610 (2020).

DOI: 10.1016/j.molliq.2020.113610

With the increasing demand for miniaturization and integration of the micro/nano-electromechanical systems applied in engineering fields, the phase transition like evaporation heat transfer has been an effective thermal management method to overcome the heat dissipation problem. The wettability of the surface can significantly affect the evaporation heat transfer at the nanoscale. Most studies only investigated the heat transfer enhancement mechanisms at the solid-liquid interface. This paper not only researches the heat transfer at the solid-liquid interface but also analyzes the relevant variations at the liquid-vapor interface. The hybrid surface with the larger area ratio of the hydrophilic part has better heat transfer performance. Moreover, the solid-liquid interfacial thermal resistance decreases as the area ratio of the hydrophilic part increases, and the interaction energy per unit heat transfer area increases as the area ratio of the hydrophilic part increases. At last, in the simulated cases, when the thickness of the liquid film is much greater than 1 nm, the potential energy at the liquid-vapor interface does not change significantly as the area ratio of the hydrophilic part and the liquid-vapor area becomes larger as the area ratio of the hydrophilic part increases. The relevant analyses about the heat transfer at the solid-liquid interface and the liquid- vapor interface more fully explain the evaporation heat transfer enhancement mechanisms caused by surface wettability at the nanoscale. (C) 2020 Elsevier B.V. All rights reserved.

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