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친수성과 소수성이 복합된 마이크로/나노 혼합 구조 표면에서의 수조비등 연구
조학래(Hak Rae Cho),김영현(Young Hyun Kim),장진규(Jin Gyu Jang),Narayan Pandurang Sapkal,박수청(Su Cheong Park),주형민(Hyeong Min Joo),유동인(Dong In Yu) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Surface roughness and wettability is important to enhance not only critical heat flux (CHF) but also boiling heat transfer coefficient (HTC). Generally hydrophilic micro/nano structures contribute on enhancing liquid supply to dry spot and delay CHF and hydrophobic surface contribute on promoting nucleation and enhancing HTC. Therefore, excellent pool boiling performance can be achieved by combining hydrophilic structures and hydrophobic structures. In this study, we fabricated hydrophilic micro pillar (MP) surface, biphilic micro pillar (BMP) surface, hydrophilic micro/nano pillar (MNP) surface and biphilic micro/nano pillar (BMNP) surface. To investigate the effect of surface roughness and heterogeneous wettability on critical heat flux phenomena, pool boiling experiments were conducted using fabricated surfaces and bare surface.