Lin, H.-C.; Kang, C.-H.; Cheng, H.-C.; Chang, T.-L.; Chen, P.-H. Saturated Boiling Enhancement of Novec-7100 on Microgrooved Surfaces with Groove-Induced Anisotropic Properties. Appl. Sci.2024, 14, 495.
Lin, H.-C.; Kang, C.-H.; Cheng, H.-C.; Chang, T.-L.; Chen, P.-H. Saturated Boiling Enhancement of Novec-7100 on Microgrooved Surfaces with Groove-Induced Anisotropic Properties. Appl. Sci. 2024, 14, 495.
Lin, H.-C.; Kang, C.-H.; Cheng, H.-C.; Chang, T.-L.; Chen, P.-H. Saturated Boiling Enhancement of Novec-7100 on Microgrooved Surfaces with Groove-Induced Anisotropic Properties. Appl. Sci.2024, 14, 495.
Lin, H.-C.; Kang, C.-H.; Cheng, H.-C.; Chang, T.-L.; Chen, P.-H. Saturated Boiling Enhancement of Novec-7100 on Microgrooved Surfaces with Groove-Induced Anisotropic Properties. Appl. Sci. 2024, 14, 495.
Abstract
The effects of anisotropic properties (wettability and roughness) on microgroove surfaces in pool boiling heat transfer using Novec-7100 as a working fluid were experimentally investigated. The idea of introducing the concept of anisotropic wettability in boiling experiments draws inspiration from biphilic surfaces. The investigation is also motivated by two-phase immersion cooling, which involves phase-change heat transfer by using dielectric liquid as a working fluid. Very few studies have focused on the effects of surfaces with anisotropic properties on boiling performance. Thus, this study aims to examine the pool boiling heat transfer performance on surfaces with microgroove-induced anisotropic properties under the saturation condition. A femtosecond laser–texturing method was employed to create microgroove surfaces with different groove spacing. The results indicated that anisotropic properties affected the heat transfer coefficient and critical heat flux. Relative to the plain surface, microgroove surfaces enhanced the heat transfer performance due to the increased number of bubble nucleation sites and higher bubble detachment frequency. An analysis of bubble dynamics under different surface conditions was conducted with the assistance of high-speed images. The microgroove surface with groove spacing of 100 μm maximally increased the BHTC by 37% compared to the plain surface. Finally, the CHF results derived from experiments were compared with related empirical correlations. Good agreement was achieved between the results and the prediction correlation.
Keywords
Pool boiling; Femtosecond laser; Anisotropic properties; Bubble dynamics; Heat transfer coefficient; Critical heat flux
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
