Jin Yao Ho
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang
Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
Kai Choong Leong
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
Charles Yang
School of Mechanical and Aerospace Engineering
Nanyang Technological University 50 Nanyang Avenue, Singapore 639798 Republic of Singapore
Indro Pranoto
School of Mechanical and Aerospace Engineering, Nanyang Technological University
Nucleate pool boiling heat transfer performance of silicon surfaces with different CNT coated areas were experimentally investigated with FC-72 as the coolant in a water-cooled thermosyphon system. The experimental results revealed that the heat transfer enhancement and CHF increased with increasing CNT coated area. At 90% CNT coating area, approximately 1.5 times enhancement in both pool boiling heat transfer and CHF were recorded as compared to a bare silicon surface. Based on visual observations of bubble nucleation between the low (5 W/cm2) and intermediate (16 W/cm2) heat flux regimes where most of the bubbles were seen departing from the edges of the CNT coating, the interlaced patterned CNT coating was developed to increase the CNT coating perimeter for further heat transfer enhancement. Subsequent experiments with the interlaced patterned CNT coating recorded a further 15% heat transfer enhancement as compared to the surface with 90% CNT coated area.