An Experimental Study of Fouling Effect on the Heat Transfer Around a Tube in Staggered Tube Banks

Title & Authors
An Experimental Study of Fouling Effect on the Heat Transfer Around a Tube in Staggered Tube Banks
Kim, Min-Su; Baek, Byeong-Jun; Park, Bok-Chun;

Abstract
An experimental study has been performed to investigated the forced convection heat transfer characteristics of 6 circular cylinders in staggered arrangement in a cross flow of air. The water scale deposited on condenser wall of power plant was used to investigate the effect of roughness of scaled surfaces. The relative roughness*average diameter of scale/cylinder diameter) was in a range of k/d=0.0066, 0.0111, 0.0167, 0.0222 and 0.0278. The cylinder spacings(L/d) varies from 1.5 to 4.0 where L denote the cylinder spacings along and normal to the upstream uniform flow direction. The Reynolds number was varied in a range of 10, 000$\small{\leq}$ Re $\small{\leq}$ 50,000. The local and mean Nusselt numbers were investigated as a function of scale roughness, the cylinder spacing and Reynolds number. The results are compared with those of clean cylinder and inline tube bank, subsequently the mean fouling resistance over the entire circumference was estimated from those results as a function of scale roughness, the cylinder spacing and Reynolds number.
Keywords
Fouling Effect;Fouling Resistance;Staggerd Tube Bank;Scale Thickness;Separation Point;
Language
Korean
Cited by
1.
A Study on Heat Transfer Characteristics for Staggered Tube Banks in Cross-Flow,;;;

Journal of Mechanical Science and Technology, 2007. vol.21. 3, pp.505-512
References
1.
임용섭, 손동기, 이준식, 양경수, 1998, 'Reynolds 수와 난류강도의 변화에 따른 실린더 주위 유동 박리점의 거동에 관한 실험적 연구,' 대한기계학회논문집 B권, 제22권, 제7호, pp. 889-898

2.
Aiba S., Tsuchiba H. and Ota T., 1982, 'Heat Transfer Around Tubes in Staggered Tube Banks,' Bulletin of JSME, Vol. 25, pp. 927-933

3.
Bott T. R. and Gudmundsson J. S., 1978, 'Rippled Silica Deposit in Heat Exchanger Tubes,' Heat Transfer, Vol. 4, pp. 373-378

4.
Watkinson A. P., 1975, 'Scaling of Spirally Indented Heat Exchanger Tubes,' ASME Journal of Heat Transfer, Vol. 97, pp. 490-492

5.
Chamra L. A. and Webb R. L., 1993, 'Effect of Particle Size Distribution on Particulate Fouling in Enhanced Tubes,' J. of Enhanced Heat Transfer, Vol. 1, pp. 65-75

6.
Ota T., Nishiyama H. and Akama Y., 1984, 'Fouling Effects of Geothermal Water Scale upon Heat Transfer around a Circular Cylinder,' Trans. of JAR, Vol. 1, pp. 51-57

7.
Ota T. and Nishiyama H., 1985, 'Fouling Effects of Geothermal Water Scale upon Heat Transfer around an Elliptic Cylinder,' Warme und Stoffubertragung, Vol. 19, pp. 93-100

8.
Kim M. S. and Ota T., 1997, 'Fouling Effects of Geothermal Water Scale on the Heat Transfer around a Tube in a Bank,' The 4th Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, pp. 2079-2086

9.
Ota T., Kim M. S. and Yang K. S., 1996 'Fouling Effects of Geothermal Water Scale on Heat Transfer around a Tube in a Bank,' Proceedings of the 3rd KSME-JSME Thermal Engineering Conference, Vol. 3, pp. 145-150

10.

11.
Achenbach E., 1977, 'The Effect of Surface Roughness on the Heat Transfer from a Circular Cylinder to the Cross Flow of Air,' Int. J. Heat Mass Transfer, Vol. 20, pp. 359-368

12.
Holman J.P., 1997, Heat Transfer, McGraw-Hill

13.
Somerscales, E. F. C. and Knudsen, J. G., 1981, Fouling of Heat Transfer Equipment, Hemisphere Publishing Corp.