Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
권호 표지

Enhancement of Heat and Mass Transfer by Insert Spring in a Vertical Absorber with Surfactant

  • Published : 2004.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

This research was concerned with the enhancement of heat transfer by surfactant added to the aqueous solution of LiBr. Different vertical tubes were tested with and without an additive of normal octyl alcohol. The test tubes are a bare inner surface. a groove inner surface, a corrugated inner surface and a spring inserted inner surface tubes. The additive concentration was about 0.08 mass%. The heat transfer coefficient was measured as a function of the film Reynolds number in the range of 20~200. Experiments were carried out at higher cooling water temperature of $35^{\circ}C$ to simulate an air cooling condition for several kinds of absorber testing tubes. The experimental results were compared with and without surfactant. The enhancement of heat transfer by Marangoni convection effect which was generated by addition of the surfactant is observed in each test tube. Especially, it is clarified that the tube with an inserted spring has the highest enhancement effect.

Keywords

References

  1. Yoon, J. I. 1994, Characteristic of Heat and Mass Transfer for a Falling Film Type Absorber with Insert Spring Tubes, Transactions of KSME(B), Vol. 19, No. 1. pp. 1501-1509
  2. William, A. M. and Horacio. P. B., 1993, Vertical-tube aqueous LiBr falling film absorption using advanced surfaces, International Absorption Heat Pump Conference, ASME, pp. 185-202
  3. Yoon, J. I. Kwon, O. K, Moon, C. G, 1999, Enhancement Investigation of Heat and Mass Transfer in Absorber with Enhanced Tubes, KSME International Journal. Vol. 13. No.9, pp.640-646
  4. Yoon. J. I., Kim, E., Choi. K.H., and Seol. W.S., 2002. Heat Transfer Enhancement with a Surfactants on Horizontal Bundle Tubes of an Absorber, International Journal of Heat and Mass Transfer, Vol. 45, pp. 735-741
  5. Hoffmann, 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. Refrig., Vol. 19. No.5. pp. 331-341
  6. Cosenza, F. Vliet, G.C., 1990, Absorption in flowing water/LiBr films on horizontal tubes, ASHRAE Trans., 96, pp. 693-701
  7. Kim. K. J .. Neil S. B. and Byard D. W.. 1993, Experimental Investigation of Enhanced Heat and Mass Transfer Mechanisms Using Additives for Vertical Falling Film Absorber. International Absorption Heat Pump Conference, ASME. pp. 41-47
  8. Kashiwagi, T. 1985. The activity of surfactant in high-performance absorber and absorption enhancement. Refrigeration. Vol. 60, No. 687. pp. 72~79
  9. Yoon. J. I., Kwon O. K., Moon C. G., and Kashiwagi T., 1999. 'The Effect of Surfactant in the Absorptive and Regenerative Processes'. KSME International Journal. Vol.13. No.3. pp.264-272 https://doi.org/10.1007/BF02970485
  10. McNeely. L. A. 1979. 'Thermodynamic properties of aqueous solution of Lithium Bromide, ASHRAE Transactions, Vol. 85, Pt,1. pp. 413~434