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Heat transfer performance of film condensation created by forced flow

ABSTRACT
In this work, condensate film on a vertical wall cooled on the external side by forced flow is analysed as a conjugate heat transfer problem. The treated case is that the condensate film and forced flow boundary layer are in a parallel-flow arrangement. The mass, momentum and energy boundary layer equations of the condensate film and forced flow are set in a dimensionless form to generalize the model. The parameters affecting the thermal communication between the condensate film and the forced flow are defined from the analysis. These parameters explain the relative impact of the three involved thermal resistances of solid wall, forced convection and film condensation on the local and mean Nusselt number. The study shows that the Nusselt number predicted by the present conjugate model is different from that predicted by a Nusselt-type model.
KEYWORDS
PAPER SUBMITTED: 2017-12-18
PAPER REVISED: 2018-03-30
PAPER ACCEPTED: 2018-03-31
PUBLISHED ONLINE: 2018-04-28
DOI REFERENCE: https://doi.org/10.2298/TSCI171218134M
REFERENCES
  1. Nusselt, W., Die Oberflachen Kondensation des Wasserdampes, Z. Ver. Deut. Ing., 60(1916), pp.541-546
  2. Winkler, C.M., Chen, T.S., Minkowycz, W.J., Film condensation of saturated and superheated vapors along isothermal vertical surfaces in mixed convection, Numerical Heat Transfer, 36(1999), pp. 375-393
  3. Rohsenow, W.M., Heat transfer and temperature distribution in laminar film condensation," Trans. ASME, J. Heat Transfer, 78(1956), pp. 1645-1648
  4. Xu, H., You, X. Ch., Pop, I., Analytical approximation for laminar film condensation of saturated stream on an isothermal vertical plate, Appl. Math. Model, 32(2008), pp. 738-748
  5. Chang, T.-B., Mixed-convection film condensation along outside surface of vertical tube in saturated vapor with forced flow, Applied Thermal Engineering, 28 (2008), pp. 547-555
  6. Le, Q.T., Ormiston, S.J., Soliman, H.M., A closed-form solution for laminar film condensation from quiescent pure vapour on curved vertical walls, Int. J. of Heat and Mass Transfer, 73(2014), pp. 834-838
  7. Kim, S., Lee, Y.-G., Jerng, D.-W., Laminar film condensation of saturated vapor on an isothermal vertical cylinder, Int. J. of Heat and Mass Transfer, 83(2015), pp. 545-55
  8. Poulikakos, D., Interaction between film condensation on one side of a vertical wall and natural convection on the other side, J. of Heat Transfer, 108(1986), pp. 560-566
  9. Char, M.-H., Lin, J.-D., Conjugate film condensation and natural convection between two porous media separated by a vertical wall, Acta Mechanica, 148(2001), pp. 1-15
  10. Mosaad, M., Natural convection in a porous medium coupled across an impermeable vertical wall with film condensation, Heat and Mass Transfer, 22(1999), pp. 23-30
  11. Rashed Al-Ajmi, M. Mosaad, Heat exchange between film condensation and porous natural convection across a vertical wall, FDMP, 8(2011), 1, pp.51-67
  12. Patankar, S. V., Sparrow, E. M., Condensation on an extended surface, J. of Heat Transfer, 101(1979), pp. 434- 440
  13. Faghri, M., Sparrow, E.M., Parallel flow and counter flow on an internally cooled tube, Int. J. Heat Mass Transfer, 23 (1980), pp. 559-56.
  14. Kose, S., Theoretical investigation of Conjugate condensation heat transfer inside vertical tubes, Doctor Thesis, Middle East Technical University, Turkey, 2010
  15. Chen, H.T., Chang, S.M., Thermal interaction between laminar film condensation and forced convection along a conducting wall, Acta Mechanica, 118(1996), pp. 13 -26
  16. Bautista, O., Méndez, F., Treviño, C., Graetz problem for the conjugated conduction-film condensation process, Thermophysics and Heat Transfer, 14(2000), pp. 96-102
  17. Luna, N., Méndez, F., Film condensation process controlled by a Darcy cooling fluid flow, Thermophysics and Heat Transfer, 18(2004), pp. 388-394
  18. C. Heinle and D. Drummer, "Potential of thermally conductive polymers for the cooling of mechatronic parts," Physics Procedia, 3(2010), pp. 735-744.
  19. J. G. Cevallos, A. E. Bergles, A. Bar-Cohen, P. Rodgers and S. K. Gupta, "Polymer Heat Exchangers- History, Opportunities, and Challenges," Heat Transfer Engineering, 12(2012), pp. 1075-1093
  20. R. Trojanowski, T. Butcher, M. Worek, G. Wei, Polymer Heat Exchanger Design for Condensing Boiler Applications. Applied Thermal Engineering, 103(2016), PP. 150-158