https://scholars.lib.ntu.edu.tw/handle/123456789/633013
標題: | Effects of wide-range copper surface wettability on spray cooling heat transfer | 作者: | Lin, Pei Ching Cheng, Hui Chung PING-HEI CHEN |
關鍵字: | Heat transfer enhancement | Spray cooling | Surface modification | Surface wettability | 公開日期: | 1-五月-2023 | 出版社: | ELSEVIER SCIENCE INC | 卷: | 143 | 來源出版物: | Experimental Thermal and Fluid Science | 摘要: | This study conducted a spray cooling experiment to investigate the effects of varying surface wettability on the heat transfer performance of modified copper surfaces in both single- and two-phase regimes. The contact angles of the test surfaces ranged from 0° to 150°. The spray cooling experiment was performed using deionized water. The results indicated that surface wettability influenced heat transfer performance during spray cooling. In the nonboiling regime, the surface with higher hydrophilicity exhibited higher heat transfer performance owing to the larger wetting area available for heat transfer. The surface temperature of the superhydrophobic surface reached saturation at a relatively low heat flux; therefore, nucleation occurred rapidly, and the increase in the heat transfer coefficient intensified as the heat flux increased. Consequently, the heat transfer performance of the hydrophobic surface exceeded that of the plain surface in the two-phase regime. Evaporation fraction values were derived for the various test surfaces. Finally, a dimensionless surface wettability number, defined as the ratio of the droplet contact diameter to the droplet height, was used to establish heat transfer prediction models considering surface wettability in the single-phase and two-phase regimes. The heat transfer performance in the single-phase and two-phase regimes could be predicted within error bands of 18 % and 33.3 %, respectively. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633013 | ISSN: | 08941777 | DOI: | 10.1016/j.expthermflusci.2022.110834 |
顯示於: | 機械工程學系 |
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