Browse > Article

Flow Visualization of Oscillation Characteristics of Liquid and Vapor Flow in the Oscillating Capillary Tube Heat Pipe  

Kim, Jong-Soo (School of Mechanical Engineering, Pukyong National University)
Kim, Ju-Won (LG Electronics Co. Ltd,)
Jung, Hyun-Seok (Samsung Electronics Co. Ltd)
Publication Information
Journal of Mechanical Science and Technology / v.17, no.10, 2003 , pp. 1507-1519 More about this Journal
Abstract
The two-phase flow patterns for both non-loop and loop type oscillating capillary tube heat pipes (OCHPs) were presented in this study. The detailed flow patterns were recorded by a high-speed digital camera for each experimental condition to understand exactly the operation mechanism of the OCHP. The design and operation conditions of the OCHP such as turn number, working fluid, and heat flux were varied. The experimental results showed that the representative flow pattern in the evaporating section of the OCHP was the oscillation of liquid slugs and vapor plugs based on the generation and growth of bubbles by nucleate boiling. As the oscillation of liquid slugs and vapor plugs was very speedy, the flow pattern changed from the capillary slug flow to a pseudo slug flow near the annular flow. The flow of short vapor-liquid slug-train units was the flow pattern in the adiabatic section. In the condensing section, it was the oscillation of liquid slugs and vapor plugs and the circulation of working fluid. The oscillation flow in the loop type OCHP was more active than that in the non-loop type OCHP due to the circulation of working fluid in the OCHP. When the turn number of the OCHP was increased, the oscillation and circulation of working fluid was more active as well as forming the oscillation wave of long liquid slugs and vapor plugs in the OCHP. The oscillation flow of R-142b as the working fluid was more active than that of ethanol and the high efficiency of the heat transfer performance of R -142b was achieved.
Keywords
Oscillating Capillary Tube Heat Pipe (OCHP); Two-Phase Flow Patterns; Flow Oscillation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Akachi, H., 1994, 'Loop type serpentine capillary tube heat pipe,' Proceedings of 71th General Meeting Conference of JSME, Vol. 3, No. 940-10, pp. 606-611
2 Akachi, H., Polasek, F. and Stulc, P., 1996, 'Pulsating heat pipes,' Proceedings of 5th Int. Heat Pipe Symposium, Melbourne, pp. 208-217
3 Coleman, J. W. and Garimella, S., 1999, 'Characteristics of Two-Phase Flow Patterns in a Small Diameter Round and Rectangular Tubes,' Int. J. of Heat and Mass Transfer, Vol. 42, pp. 2869-2881   DOI   ScienceOn
4 Domianides. C. A. and Westwater, J. W., 1988, 'Two-Phase Flow Patterns in a Compact Heat Exchanger and in Small Tubes,' Proceedings of second U.H. National Conference on Heat Transfer, Vol. 11, pp. 1257-1268
5 Fukano, T., Kariyasaki, A. and Kagawa, M., 1990, 'Flow Patterns and Pressure Drop in Isothermal Gas-Liquid Concurrent Flow in a Horizontal Capillary Tube,' JSME(B), Vol. 56, No. 528, pp. 174-182
6 Gi, K., Sato, F. and Maezawa, S., 1999, 'Flow Visualization Experiment on Oscillating Heat Pipe,' 36th National Heat Transfer Symposium of Japan, pp. 659-660
7 Hosoda, M., Nishio, S. and Shirakashi, R., 1997, 'Bubble-Driven Heat Transport Tube(Flow pattern and Heat transport Model),' 34th National Heat Transfer Symposium of Japan, Vol. 1, pp. 267-268
8 Kariyasaki, A., Fukano, T., Ousaka, A. and Kagawa, M., 1992, 'Isothermal Air-Water- Two-Phase Up and Down Flows in a Vertical Capillary tube (Ist Report, Flow Pattern and Void Fraction),' JSME(B), Vol. 58, No. 553, pp. 40-46
9 Kim, J. S., Lee, W. H., Lee, J. H., Jung, H. S., Kim, J. H. and Jang, I. S., 1999, 'Flow Visualization of Oscillating Capillary Tube heat pipe,' Proceeding of Thermal Engineering Conference of KSME, pp. 65-70
10 Mishima, K. and Hibiki, T., 1995, 'Effect of Inner Diameter on Some Characteristics of Air-Water Two-Phase Flows in Capillary tubes,' JSME(B), Vol. 61, No. 589, pp. 99-106
11 Nishio, S., 1997, 'Bubble Driven Heat Transport Tubes,' Journal of the Heat Transfer Society of Japan, Vol. 3, No. 142, pp. 53-56
12 Numata, S., Shirakashi, R. and Nishio, S., 1999, 'Closed-Loop Heat Transport Tube (Effects of Tube Diameter),' 36th National Heat Transfer Symposium of Japan, pp. 675-676
13 Lee, W. H., Jung, H. S., Kim, J. H. and Kim, J. S., 1999, 'Flow Visualization of Oscillating Capillary Tube Heat Pipe,' 11th International Heat Pipe Conference, Tokyo, Japan, Vol. 2, pp. 131-136
14 Suo, M. and Griffith, P., 1964, 'Two-Phase Flow in Capillary Tubes,' Journal of Basic Engineering, Transaction of the ASME, pp. 576-582
15 Miyazaki, Y and Arikawa, M., 1999, 'Visualization of Oscillating heat pipe,' 36th National Heat Transfer Symposium of Japan, pp. 661-662
16 Takahashi, O., Kawara, Z., Serizata, A., Kohno, M., Kakinoki, S. and Akachi, H.,1998, 'Visualization of Boiling and Condensation in Capillary Tunnel Type Flat Plate Heat Pipe with Proton Radiography,' 36th National Heat Transfer Symposium of Japan, pp. 529-530
17 Rossi, L., and Polasek, F., 1999, 'Thermal Control of Electronic Equipment by Heat Piped and Two-Phase Thermosyphon,' Proceedings of 11th International Heat Pipe Conference Keynote Lecture, Japan