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Date of Publication:2021-01-01

Journal:Huagong Xuebao/CIESC Journal

Volume:72

Issue:8

Page Number:4093-4103

ISSN No.:0438-1157

Abstract:The laser ablation method is used to prepare four superhydrophobic/hydrophilic regular microarray structure surfaces on the polished copper without coating modification. In this work, visualization and temperature processing calculations were applied to analyze the effects of surface wettability and subcooling on flow boiling heat transfer performance, then the active nucleation site density between experimental data and predicted value were compared. The results show that the hydrophobic surface has a negative effect on single-phase flow heat transfer and presents an outstanding heat transfer coefficient (HTC) by 75.5% compared with the bare copper surface. Simultaneously, it has an early appearance of onset of nucleate by 3.5 K, and the number of nucleation sites was increased by more than 5 times compared with the bare copper surface, but has a lower critical heat flux. The super hydrophilic surface could enhance the single-phase flow heat transfer and slightly increased the flow boiling heat transfer. Comparing the bubble growth process on the hydrophilic and hydrophobic surface, the bubbles at the end of the hydrophobic surface were easy to coalesce and the growth period was longer, while the growth period of bubbles on the hydrophilic surface was shorter, and no obvious bubble coalescence occurred. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

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