김호영 정광훈 이헌주 장영수 이윤표 2024-01-21T01:30:41Z 2024-01-21T01:30:41Z 2021-09-06 2007-03 1226-4881 https://pubs.kist.re.kr/handle/201004/134569 Thermal bubble formation is a fundamental process in nucleate boiling heat transfer and many microelectromechanical thermal systems. One of the established facts is that heterogeneous nucleation is originated from vapors trapped inside cavities. Based on this, we performed an experimental study on the formation of thermal bubbles from microcavity fabricated by microfabrication technology on a copper plate. The cavity was filled with aluminum particles to enhance thermal bubble formation. We observed the thermal bubble behaviors, such as bubble incipience, diameter, frequency and coalescence during nucleate boiling. The experimental data showed that the superheat required to trigger the bubble formation was significantly reduced when the cavity was filled with microparticles. We found that the initial increase of superheat led to the increase of both the departure diameter and frequency while the further increase of superheat caused multiple bubbles to coalesce resulting in the decrease of departure frequency. 대한기계학회 미세 입자로 충전된 캐비티에서의 열 기포 형성 Formation of Thermal Bubble from Particle-Filled Microcavity Article 1 대한기계학회논문집 B, v.31, no.3, pp.248 - 255 대한기계학회논문집 B 31 3 248 255 scopus kci ART001038850 Key Words : Thermal Bubble(열기포) Micro-porous Cavity(다공성 미세 캐비티) Superheat (과열도) Nucleate Boiling(핵비등)