Abstract
This research investigated the thermal performance of various horizontal closed-loop oscillating heat-pipe systems with check valves (HCLOHPs/CVs). Numerous test systems were constructed using copper capillary tubes with assorted inner diameters, evaporator lengths, and check valves. The test systems were evaluated under normal operating conditions using ethanol, R123, and distilled water as working fluids. The system’s evaporator sections were heated by hot water from a hot bath, and the heat was removed from the condenser sections by cold water from a cool bath. The adiabatic sections were well insulated with foam insulators. The heat-transfer performance of the various systems was evaluated in terms of the rate of heat transferred to the cold water at the condenser. The results showed that the heat-transfer performance of an HCLOHP/CV system could be improved by decreasing the evaporator length. The highest performance of all tested systems was obtained when the maximum number of system check valves was 2. The maximum heat flux occurred with a 2 mm inner diameter tube, and R123 was determined to be the most suitable working fluid.
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This paper was recommended for publication in revised form by Associate Editor Man-Yeong Ha
Sampan Rittidech received his Ph.D. in Mechanical Engineering from Chiang Mai University, Thailand, in 2002. He is currently an Associate Professor at the Faculty of Engineering at Mahasarakham University, Thailand. His research interests include heat transfer, heat pipe, and heat exchanger. He is the head of the Heat Pipe and Thermal Tools Design Research Laboratory (HTDR).
Numpol Pitpatpaiboon received his B.Eng. degree in Mechanical Engineering from Mahasarakham University, Thailand, in 2004. He then received his M.Eng. degree in Mechanical Engineering from the same university in 2005. He is currently a Lecturer at the Faculty of Engineering at Rajamangala University of Technology Isan Sakon Nakhon Campus, Sakhonnakhon Province, Thailand.
Sanhawat Thongdaeng received his B.Eng. degree in Mechanical Engineering from Mahasarakham University, Thailand, in 2007. He is currently an M.Eng. student in Mechanical Engineering in Mahasarakham University, Thailand.
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Rittidech, S., Pipatpaiboon, N. & Thongdaeng, S. Thermal performance of horizontal closed-loop oscillating heat-pipe with check valves. J Mech Sci Technol 24, 545–550 (2010). https://doi.org/10.1007/s12206-009-1221-7
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DOI: https://doi.org/10.1007/s12206-009-1221-7