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KSME international journal v.17 no.4, 2003년, pp.581 - 589  

Non-absorbable Gas Effects on Heat and Mass Transfer in Falling Film Absorption

Kim, Byongjoo   (Department of Mechanical and System Design Engineering, Hongik UniversityUU0013384  ); Lee, Chunkyu   (Graduate School, Hongik UniversityUU0013384  );
  • 초록

    Film absorption involves simultaneous heat and mass transfer in the gas-liquid system. While the non-absorbable gas does not participate directly In the absorption process. its pretence does affect the overall heat and mass transfer. An experimental study was performed to investigate the heat and mass transfer characteristics of LiBr-H $_2$ O solution flow ing over 6-row horizontal tubes with the water vapor absorption in the pretence of non-absorbable gases. The volumetric concentration of non-absorbable gas, air, was varied from 0.17 to 10.0%. The combined effects of the solution flow rate and its concentration on the heat and mass transfer coefficients were also examined. The presence of 2% volumetric concentration of air resulted in a 25% reduction in the Nusselt number and 41% reduction in the Sherwood number Optimum film Reynolds number was found to exist at which the heat and mass transfer reach their maximum value independent of air contents. Reduced Nusselt and Sherwood numbers. defined as the ratio of Nusselt and Sherwood numbers at given non-absorbable gas content to that with pure water vapor, were correlated to account for the reduction in the heat and mass transfer due to non-absorbable gases in a falling film absorption process.


  • 주제어

    Falling Film Absorption .   Aqueous LiBr solution .   Non-absorbable Gas .   Optimum Reynolds Number .   Reduced Nusselt Number .   Reduced Sherwood Number.  

  • 참고문헌 (10)

    1. Yang, R. and Wood, B. D. 1993, 'Experimental Study for Heat and Mass Transfer in Wavy Film Absorption with the Presence of Non-absorbable Gas,' Chem. Eng. Comm. Vol. 125, pp. 77-90 
    2. Haselden G. G. and Malaty, S. A. 1959, 'Heat and Mass Transfer Accompanying the Absorption of Ammonia in Water,' Trans. Inst. Chem. Engrs., Vol. 37, No. 10, pp. 136-146 
    3. Hikita, H., Nakanishi, K. and Kataoka, T., 1959, 'Liquid Phase Mass Transfer in Wetted-Wall Columns,' Chem. Eng. Tokyo, Vol. 23, No. 7, pp. 459-466 
    4. Hoffman, L., Greiter, I., Wagner, A., Weiss, V. and Alefeld, G. 1996, 'Experimental Investigation of Heat Transfer in a Horizontal Tube Falling Film Absorber with Aqueous Solutions of LiBr with and without Surfactants,' Int. J. Refrigeration, Vol. 19, No. 5, pp. 331-341 
    5. Kim, B. J. and Lee, C. W., 1998, 'Effects of Non-absorbable Gases on the Absorption Process of Aqueous LiBr Solution Film in a Vertical Tube (1)-Experimental Studies,' Transactions of KSME (B), Vol. 22, No. 4, pp. 489-498 
    6. Kline, S. J. 1985, 'The Purposes of Uncertainty Analysis,' Trans. ASME, J. Fluids Eng., Vol. 107, pp. 153-160 
    7. Vliet, G. C. and Cosenza, F. B. 1992, 'Absorption Phenomena in Water-Lithium Bromide Films,' Proc. Absorption Heat Pump Conf., pp. 53-61 
    8. Ameel, T. A., Kim, K. J. and Wood, B. D. 1997, 'Non-absorbable Gas Effects on Heat and Mass Transfer in Wavy Laminar Falling Film Absorption,' Solar Energy, Vol. 60, No. 6, pp. 301-311 
    9. Ameel, T. A. and Wood, B. D. 1992, 'Non-absorbable Gas Effects on Heat and Mass Transfer in Wavy Laminar Falling Film Absorption,' Solar Engineering, Vol. 1, pp. 219-228 
    10. Burdukov, A. P., Bufetov, N. S., Deriy, N. P., Dorokhov, A. R. and Kazakov, V. I. 1980, 'Experimental Study of the Absorption of Water Vapor by Thin Films of Aqucous Lithium Bromide,' Heat Transfer-Soviet Research, Vol. 12, pp. 118-123 

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