Experimental study of pool boiling enhancement for surface structuring with inclined intersected mesochannels using WEDM method on copper surfaces

• Published in: Journal of thermal analysis and calorimetry 2020-02, Vol.139 (3), p.1849-1861
• Main Authors: Saffari, Hamid, Fathalizadeh, Hamidreza, Moghadasi, Hesam, Alipour, Shahab, Hosseinalipour, Seyed Mostafa
• Format: Article
• Language: English
• Subjects: Analysis; Analytical Chemistry; Boiling; Capillary flow; Chemistry; Chemistry and Materials Science; Copper; Copper products; Cross-sections; Electric discharges; Fins; Force and energy; Heat flux; Heat transfer; Heat transfer coefficients; Inclination; Inorganic Chemistry; Measurement Science and Instrumentation; Methods; Physical Chemistry; Polymer Sciences; Pressure effects
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-019-08601-1

This current paper presents the experimental investigation of pool boiling enhancement for surface structuring using wire electric discharge machine (WEDM) method in saturated water at atmospheric pressure. Further, the effects of 45° inclination, geometry dimensions, cross-sectional angle of fins (15°, 45° and 90°) and WEDM current which are used in fabrication surfaces on copper surface were examined. The experimental results showed that the heat dissipation increases with higher WEDM current, lower cross-sectional fin angle (CFA) and deeper channel. Sample # 9 with more depth and high CFA reached a maximum heat flux of 120 W cm −2 which corresponds to an enhancement of 200% in heat transfer coefficient compared to the plain surface. The improved heat transfer is attributed to bubble dynamics, heat transfer area, bubble slide and scrape, and capillary flow.