JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Pool Boiling Enhancement of R-123 Using Perforated Plates
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Pool Boiling Enhancement of R-123 Using Perforated Plates
Kim, Nae-Hyun;
  PDF(new window)
 Abstract
In this study, we investigate the pool boiling enhancement caused by perforated plates on top of a smooth surface. We conduct tests using R-123 at atmospheric pressure. It was shown that perforated plates significantly enhanced the pool boiling of the smooth surface. The reason may be attributed to the increased bubble contact area between the plates. The results showed that the enhancement ratio was dependent on the heat flux. At high heat flux, the enhancement ratio increased as the porosity increased. However, at low heat flux, the enhancement ratio decreased as the porosity increased. For the present investigation, the optimum configuration had a pore diameter of 2.0 mm, pore pitch of or , and a gap width of 0.5 mm, which yielded heat-transfer coefficients that are close to those of GEWA-T. The optimum porosity for R-123 was significantly larger than that of water or ethanol. The reason for this may be the large liquid-to-vapor density ratio along with the small latent heat of vaporization of R-123. The perforated plates yielded smaller boiling hysteresis compared with that of the smooth surface.
 Keywords
Heat Transfer Coeffcient;Heat Transfer Enhancement;Perforated Plate;Pool Boiling;
 Language
Korean
 Cited by
 References
1.
Webb, R. L. and Kim, N.-H., 2005, "Principles of Enhanced Heat Transfer," Taylor and Francis Pub.

2.
Thome, J. R., 1990, "Enhanced Boiling Heat Transfer," Hemisphere Pub. Co.

3.
Collier, J. G. and Thome, J. R., 1996, "Convective Boiling and Condensation," Oxford University Press.

4.
Nakayama, W., Daikoku, T. and Nakajima, T., 1982, "Effects of Pore Diameters and System Pressure on Saturated Pool Nucleate Boiling Heat Transfer from Porous Surfaces," J. Heat Transfer, Vol. 104, pp. 286-291. crossref(new window)

5.
Chien, L.-H. and Webb, R. L., 1998, "A Parametric Study of Nucleate Boiling on Structured Surfaces, Part 1: Effects of Tunnel Dimensions," J. Heat Transfer, Vol. 120, pp. 1042-1048. crossref(new window)

6.
Chien, L.-H. and Webb, R. L., 1998, "A Parametric Study of Nucleate Boiling on Structured Surfaces, Part II: Effect of Pore Diameter and Pore Pitch," J. Heat Transfer, Vol. 120, pp. 1049-1054. crossref(new window)

7.
Kim, N.-H. and Choi, K.-K., 2001, "Nucleate Pool Boiling on Structured Enhanced Tubes Having Pores and Connecting Gaps," Int. J. Heat Mass Trans., Vol. 44, pp. 17-28. crossref(new window)

8.
Fan, C.-F. and Yang, C.-Y., 2006, "Pool Boiling of Refrigerants R-134a and R-404A on Porous and Structured Tubes, Part I. Visualization of Bubble Dynamics," J. Enhanced Heat Transfer, Vol. 13, No. 1, pp. 65-83. crossref(new window)

9.
Mitrovic, J. and Ustinov, A., 2006, "Nucleate Boiling Heat Transfer on a Tube Provided with a Novel Microstructure," J. Enhanced Heat Transfer, Vol. 13, No. 3, pp. 261-278. crossref(new window)

10.
Kim, D.-E., Yu, D.-I., Jerng, D.-W., Kim, M. H. and Ahn, H.-S., 2015, "Review of Boiling Heat Transfer Enhancement on Micro/nanostructured Surfaces," Exp. Thermal Fluid Sci., Vol. 66, pp. 173-196. crossref(new window)

11.
Enshen, L., Xin, M. and Chen, Y., 1988, "Pool Boiling Heat Transfer on a ST-PTRB Tube," Advances in Phase Change Heat Transfer, Xin, M., editor, Chongqing, China, pp. 90-97.

12.
Bergles, A. E. and Chyu, M. C., 1982, "Characteristics of Nucleate Pool Boiling from Porous Metallic Coatings," J. Heat Transfer, Vol. 104, pp. 279-285. crossref(new window)

13.
Kline, S. J. and McClintock, F. A., 1953, "The Description of Uncertainties in Single Sample Experiments," Mechanical Engineering, Vol. 75, pp. 3-9.

14.
Stephan, K. and Abdelsalam, M., 1980, "Heat Transfer Correlations for Natural Convection Boiling," Int. J. Heat Mass Trans., Vol. 23, pp. 73-87. crossref(new window)