DOI QR코드

DOI QR Code

An Experimental Study on Flow and Heat / Mass Transfer Characteristics of $LiBr-H_2O$ Solution Flowing over a Cooled Horizontal Tube

수평 냉각관 외부를 흘러내리는 $LiBr-H_2O$ 수용액의 유동 및 열/물질 전달 특성에 관한 실험적 연구

  • Published : 2000.08.01

Abstract

An experimental study was performed to examine the heat and mass transfer characteristics of $LiBr-H_2O$ solution flowing over a single horizontal tube with the water vapor absorption. Effects of the flow rate and the temperature of the solution at the top of the tube, the absorber pressure and the drainage pattern were considered. The absorption rate depends highly on the absorber pressure at the low flow rate condition while on the solution inlet temperature at the high flow rate condition. Also, when the flow rate is low, the absorption performance with the sheet flow drainage appeared to be higher than that with the dripping/jet drainage. However, at the high flow rate condition, the case became reversed. The liquid film became wavy with the higher absorption rate. The waves were more probable to form with the lower flow rate and temperature of the solution, and with the higher absorber pressure.

Keywords

Absorption;$LiBr-H_2O$ Solution;Horizontal Tube;Liquid Film;Drainage Pattern

References

  1. Andberg, J. W. and Vliet, G. C., 1987, 'A Simplified Model for Absorption of Vapor into Liquid Films Flowing Over Cooled Horizontal Tubes,' ASHRAE Trans., Vol. 93, Part 2, pp. 2454 -2466
  2. Andberg, J. W. and Vliet, G. C., 1987, 'Absorption of Vapors into Liquid Films Flowing Over Cooled Horizontal Tubes,' Second ASME/JSME Joint Thermal Eng. Conf., Honolulu, Hawaii, March, pp. 533-541
  3. Choudhury, S., Hisajima, D., Ohuchi, T., Nishiguchi, A., Fukushima, T. and Sakaguchi, S., 'Absorption of Vapors into Liquid Films Flowing Over Cooled Horizontal Tubes,' ASHRAE Trans.: Research, pp. 81-89
  4. Kirby, M. J. and Perez-Blanco, H., 1994, 'A Design Model for Horizontal Tube Water/Lithium Bromide Absorbers,' Heat Pump and Refrigeration Systems Design, Analysis and Applications ASME, AES- Vol. 32, pp. 1-10
  5. Cosenza, F. and Villet, G. C., 1990, 'Absorption in Falling Water/LiBr Films on Horizontal Tubes,' ASHRAE Trans., Vol. 96, Part I, pp. 693-701
  6. Vliet, G. C. and Cosenza, F. B., 1991, 'Absorption Phenomena in Water-Lithium Bromide Films,' Proc. Absorption Heat Pump Conf., pp. 53-61
  7. Greiter, I., Wagner, A., Weiss, V. and Georg, A., 1991, 'Experimental Investigation of Heat and Mass Transfer in a Horizontal-Tube Falling-Film Absorber with Aqueous Solutions,' Int. Absorption Heat Pump Conf., ASME, AES-Vol. 31, pp, 225-232
  8. Nomura, T., Nishimura, N., Wei, S. and Yamaguchi, S., 1993, 'Heat and Mass Transfer Mechanism in the Absorber of Water/LiBr Conventional Absorption Refrigerator Experimental Examination by Visualized Model,' Int. Absorption Heat Pump Conf, ASME., AES-Vol. 31, p.203
  9. Rie, D. H. and Kashiwagi, T., 1991, 'Computer Simulation of Vapor-Absorption Enhancement onto $H_2O/LiBr$ Absorbent by Marangoni Convection,' JSME Int. J .. Series 11, Vol. 34, No.2, pp. 355-361
  10. Rie, D. H. and Kashiwagi, T., 1993, 'Numerical Analysis of Heat and Mass Transfer Enhancement Process Accompanying Interfacial Disturbance in Water Vapor Absorption,' JSME Int. J., Series B, Vol. 36, No.4, pp. 636-643
  11. Kim, K. J., Berman, N. S. and Wood, B. D., 1994, 'Experimental Investigation of Enhanced Heat and Mass Transfer Mechanisms Using Additives for Vertical Falling Film Absorbers,' Proc. Int. Absorption Heat Pump Conf., New Orleans, pp. 41-47
  12. Zheng, G. S. and Worek, W. M., 1995, 'Effect of Additives on the Regeneration of a Dilute Absorbent,' J. of Thermophysics and Heat Transfer, Vol. 9, No.4, October-December, pp. 743-748
  13. 이관수, 서석청, 김영인, 박동규, 1988, '수평원관상의 LiBr 수용액에 수증기가 흡수될때의 열 및 물질전달,' 공기조화 냉동공학 논문집, 제 17 권, 제 2호, pp. 140-149
  14. 설신수, 고광웅, 이상용, 1995, '$LiBr-H_2O$<\TEX> 흡수기 내부에서의 유동 및 열/물질전달 현상에 관한 실험적 연구(I),' 공기조화 냉동공학회 동계학술발표논문집, pp. 330-334
  15. 박석호, 김현기, 김태진, 윤정인, 1997, '흡수기의 열물질전달 특성에 관한 실험적 연구,' 대한기계학회 춘계학술대회논문집 B, pp. 96 -101
  16. 설원실, 권오경, 윤정인, 1998, '$LiBr-H_2O$<\TEX> 계 흡수기의 흡수촉진에 관한 실험적 연구,' 공기조화 냉동공학 논문집, 제 10권, 제 5 호, pp. 581-588