Evaporation Length and the Working Fluid for Heat Transfer Heat Pipe
Article Sidebar
Main Article Content
Abstract
The aims of this research are to improve the limited of oscillating heat pipe (OHP) and study the effect of evaporation length and working fluid on heat transfer. In this study, R123, ethanol and water were used as the working fluids. A set of OHP was made from copper capillary tubes with the dimensions as followed; 1.77 mm inner diameter, 5, 10 and 15 cm of evaporation lengths. 50% total volume of working addition ratio and 10 turns were used. Heat was provided to the evaporator section heating plate. The adiabatic section was properly insulated. In the test operation, heat was supplied to the evaporator section and the temperature at the adiabatic section was controlled at 60oC. Flow rate and water temperature were continually measured until critical conditions were obtained.
From the results, it was concluded that the evaporation length had an effect on rate of heat transfer of oscillating heat pipe (OHP) under critical state. When the evaporator lengths increased from 5 cm to 10 and 15 cm, the critical heat transfer was decreased. The working fluids affected on heat transfer rate under critical conditions. Changing the R123 to ethanol and water resulted in the decreasing of critical heat transfer rate.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
References
สัมพันธ์ ฤทธิเดช. (2553). เทคโนโลยีท่อความร้อน. สำนักพิมพ์มหาวิทยาลัยมหาสารคาม มหาวิทยาลัยมหาสารคาม.
Akachi, H., Polasek, F., & Stulc, P. (1996). Pulsating Heat Pipe. In Proceeding of the 5 th International Heat Pipe Symposium (pp. 208-217). Australia.
Charoensawan, P., Terdtoon, P., Tantakom, P., Ingsuwan P., & Groll, M. (2000). Effect of Inclination Angles, Filling Ratios and Total Lengths on Heat Transfer Characteristic of a Closed-Loop Oscillating Heat Pipe. In Proceedings of the 6th International Heat Pipe Symposium (pp. 422-430). Thailand.
Faghri, A., Chen, M.M., & Morgan, M. (1989). “Heat transfer in two phase closed conventional and concentric annular thermosiphon. Jouranl of Heat Mass Transfer, 111, 611-618.
Noie-Baghban, S.H., & Majideian, G.R. (2000). Waste Heat Recovery using Heat Pipe Heat Exchanger for Heating for Hospital. Applied Themal Engineering, 20(14), 1271-1282.
Pipatpaiboon, N., Rittidech, S., Sukna, P., & Suddee, T. (2004). Effect of Inclinations Angles and Number of Check Valves on Heat Transfer Characteristics of a Closed-Looped Oscillating Heat Pipe with Check Valves. In Proceeding of the 1th International Seminar on Heat Pipes and Heat Recovery Systems (pp. 83-86). Malaysia.
