Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Performance of Condensation Heat Transfer for Various Working Fluid of Two-Phase Closed Thermosyphons with Various Helical Grooves

나선 그루브형 열사이폰의 작동유체의 변화에 대한 응축열전달 성능에 관한 연구

  • 한규일 (부경대학교 기계공학부) ;
  • 조동현 (대진대학교 컴퓨터응용기계설계공학과)
  • Published : 2005.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

This study concerns the performance of condensing heat transfer in two-phase closed thermosyphons with various helical grooves. Distilled water, methanol, ethanol have been used as the working fluid. In the present work, a copper tube of the length of 1200mm and 14.28mm of inside diameter is used as the container of the thermosyphon. Each of the evaporator and the condenser section has a length of 550mm, while the remaining part of the thermosyphon tube is adiabatic section. A experimental study was carried out for analyzing the performances of having 50, 60, 70, 80, 90 helical grooves. A plain thermosyphon having the same inner and outer diameter as the grooved thermosyphons is also tested for the comparison. The type of working fluid and the numbers of grooves of the thermosyphons with various helical grooves have been used as the experimental parameters. The experimental results have been assessed and compared with existing theories. The results show that the type of working fluids are very important factors for the operation of thermosyphons. And the maximum enhancement (i.e. the ratio of the heat transfer coefficients the helical thermosyphons to plain thermosyphons) is $1.5{\sim}2$ for condensation.

Keywords

References

  1. Lee, Y. S., Lee, K. O., 1995, 'Heat Exchangers of Heat Pipe,' Trans. of the KSME, Vol. 35, No. 9, pp. 805-815
  2. Park, R. J., 1992, 'Two-Phase Closed Thermosyphon with Two-FluidMixtures,' Department of Mechanical Engineering University of Ottawa, Ottawa, Ontario, Canada, M. S. Thesis
  3. Nusselt, W., 1916, 'Die Oberflachenkondensation des Wasserdampfes,' Z. Ver. Deut. Ing., 60, 541
  4. Ong. K. S., 2003, 'A Simple Theoretical Model of a Thermosyphon,' The 7th International Heat Pipe Symposium, Korean Society of Mechanical Engineers, Heat Pipe Section, pp. 1-8
  5. Noie, S. H., Kalaei, M. H. and Khoshnoodi, M., 2003, 'Experimental Investigation of a Two Phase Closed Thermosyphon,' The 7th International Heat Pipe Symposium, Korean Society of Mechanical Engineers, Heat Pipe Section, pp. 14-19
  6. Hijikata, K., Hasegawa, H. and Nagasaki, T., 1989, 'A Study on a Heat Pipe Using a Binary Mixture,' Trans. of the JSME, Vol. 55, No. 513, pp. 1469-1476 https://doi.org/10.1299/kikaib.55.1469
  7. Reed, J. G. and Tien, C. L., 1987, 'Modeling of the Two-Phase Closed Thermosyphon,' Trans. of the ASME, Vol. 109 pp. 722-730 https://doi.org/10.1115/1.3248150