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다양한 작동유체로 충전된 폐쇄 루프 맥동 히트파이프 내부 유동패턴 비교
강석구(Seok Gu Kang),김성근(Seong Keun Kim),히발 아흐메드(Hibal Ahmad),정성용(Sung Yong Jung) 한국가시화정보학회 2019 한국가시화정보학회지 Vol.17 No.3
Thermal performance and flow patterns inside the closed loop pulsating heat pipe (CLPHP) were experimentally investigated. For investigating the effect of working fluids, CLPHP was filled with various working fluids including methanol, acetone and ethanol. The thermal resistance was calculated by temperatures in evaporator and condenser and flow patterns were visualized by a digital camera. The thermal resistances for all fluids were decreased as the heat increases. Flow patterns change from static slug to elongated slug flows, bulk circulation and annular flows as the heat increases. Dry-out occurs after annular flows. For reasonable comparison of thermal performances, normalized CHF, Kutateladze number (Ku), was compared. Even though ethanol has smallest CHF, Ku of ethanol is similar with that of methanol. In addition, acetone has the highest Ku that means CLPHP with acetone provides the higher thermal performance compared with CLPHP with other fluids.