Abstract
This research investigated the effect of aspect ratios (evaporator length to inner diameter of capillary tube), inclination angles, and concentrations of silver nanofluid on the heat transfer rate of a closed-loop oscillating heat pipe with check valves (CLOHP/CV). The CLOHP/CV was made from copper tubing with an internal diameter of 2 mm. Two check valves were inserted into the tube. The tube had 40 meandering turns. The length of the evaporator was 50, 100, and 150 mm. The lengths of the evaporator, adiabatic, and condenser section were equal. The concentration of silver nanofluid was 0.25, 0.5, 0.75, and 1 %w/v, and the operating temperature was 40, 50, and, 60°C. It was found that the heat transfer rate of the CLOHP/CV using silver nanofluid as a working fluid was better than that the heat transfer rate when pure water is used because the silver nanofluid increases the heat flux by more than 10%.
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This paper was recommended for publication in revised form by Associate Editor Man Yeong Ha
Sakultala Wannapakhe received her B.Eng. degree in Mechanical Engineering (Manufacturing) from Mahasarakham University, Thailand, in 2005. She then received her M. Eng. degree in Mechanical Engineering from Mahasarakham University, Thailand, in 2007. Sakultala Wannapakhe is currently a Ph.D. student in Energy Technology at Mahasarakham University, Thailand.
Sampan Rittidech received his Ph.D. degree in Mechanical Engineering from Chiang Mai University, Thailand, in 2002. Dr. Sampan Rittidech is currently an Associate Professor at the Faculty of Engineering at Mahasarakham University in Thailand. Dr. Sampan’s research interests include heat transfer, heat pipe, and heat exchanger.
Bopit Bubphachot received his Ph.D. degree in Engineering Mechanics and Energy from University of Tsukuba, Japan, in 2008. Dr. Bopit Bubphachot is currently an Lecturer at the Faculty of Engineering at Mahasarakham University in Thailand. Dr. Bopit’s research interests include Metal Forming (Fine Blanking Process), FEM Simulation in Metal Forming Process and Fatigue and Creep-Fatigue strength for Perforated Plate.
Osamu Watanabe received his Ph.D. degree in Engineering from University of Tokyo, Japan, in 1981. Dr. Osamu Watanabe is currently a Professor at Graduate School of Systems and Information Engineering at University of Tsukuba, Japan. Dr. Osamu’s research interests include inelastic behavior, material strength in nuclear or thermal plants, code and standard for plant technology.
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Wannapakhe, S., Rittidech, S., Bubphachot, B. et al. Heat transfer rate of a closed-loop oscillating heat pipe with check valves using silver nanofluid as working fluid. J Mech Sci Technol 23, 1576–1582 (2009). https://doi.org/10.1007/s12206-009-0424-2
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DOI: https://doi.org/10.1007/s12206-009-0424-2