THERMAL SCIENCE

International Scientific Journal

Aaqib Imdad

,

Hassan Ali

,

Haroon Farooq

,

Hafiz Muhammad Ali

EFFECT OF CONDENSATE FLOW RATE, SURFACE TENSION, DENSITY AND VAPOR VELOCITY ON CONDENSATE RETENTION OF WIRE WRAPPED TUBES

ABSTRACT
Simulated condensation has been conducted on three wire wrapped tubes having same root diameter but different fin spacing of 1.5 mm, 2 mm, and 2.5 mm. Different fluids (ethanol, ethylene-glycol, and water) are used for condensation by providing them to the tubes through tiny holes in inter-fin spacing on the top of the surface of tubes. The major parameters are to be controlled in this research are fin spacing, vapor velocity, condensate flow rate and ratio of surface tension density of the fluid. Obtained results show that flooding angle (calculated from the top of the tube to the level where fluid fills the fin) rises by increasing fin spacing. Also, retention angles increase by reducing ratio of surface tension density of fluid. Acute flooding angles at zero air velocity and zero flow rate, elevates by increasing air velocity. However, obtuse flooding angles at static conditions drop by reducing air velocity. An interesting result is obtained regarding retention angle which remains almost even for the higher condensation flow rates until the tube gets inundated with condensation. Moreover, critical flow rates for all the tubes against using different working fluids are measured. Results obtained for static conditions have good correspondence with already available authentic data for flooding angle. Pictures showing condensate retention angles have been included in this paper.
KEYWORDS
Wire wrapped tubes, Heat Transfer Enhancement, condensate retention
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2021-02-02
PUBLISHED ONLINE: 2021-10-10
DOI REFERENCE: https://doi.org/10.2298/TSCI201014275I
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 1, PAGES [545 - 552]
REFERENCES
  1. Honda, H. et al., Augmentation of condensation on finned tubes by attaching a porous drainage plate, Proceedings, ASME/JSME Thermal Joint Conference, 1983, pp. 289-285
  2. Briggs, A. et al., Accurate Heat Transfer Measurements for Condensation on Horizontal, Integral-Fin Tubes, ASME Journal of Heat Transfer, 114 (1992), 3, pp. 719-726
  3. Namasivayam, S. and Briggs, A., Effect of Vapor Velocity on Condensation of Atmospheric Pressure Steam on Integral Fin-Tubes, Applied Thermal Engineering, 24 (2004), 8-9, pp. 1353-1364
  4. Owen, W. C. and Sardesai, R. G., Gravity controlled Condensation on Low Integral Fin-Tubes, Proceedings, Theory and Practice: I Chem. E. Symposium series, No. 75, (1983), pp. 415-428
  5. Rudy, T. M., and Webb, R. L., An Analytical model to predict condensate retention on horizontal integral fin tubes, ASME Journal of Heat Transfer, 107 (1985), 2, pp. 361-368
  6. Rudy, R. L. and Webb, T.M., Theoretical Model for condensation on Horizontal Integral-Fin Tubes, Proceedings, American Institute of Chem. Engineering Symposium serial No. 79, 1983
  7. Fitzgerald, C. L., Forced-Convection Condensation Heat Transfer on Horizontal Integral Fin-Tubes Including Effects of Liquid Retention, Ph.D. thesis, University of London, UK, 2011.
  8. Dreitser, G. A. and Zakirov. S. G., Heat Transfer Enhancement at Vapor Condensation from Vapor-Air Mixtures on Vertical Tubes, Heat Transfer Research, 30 (1999), 7-8, pp. 448-456, 1999
  9. Fyodorov, A. et al., Model for Condensation Heat Transfer inside Horizontal Tubes, Heat Transfer Research, 30 (1999), 7-8, pp. 474-481
  10. Anisimov, S. V. and Smirnov, Y. B., Condensation of Vapors of immiscible liquids on Horizontal Finned Tubes, Heat Transfer Research, 30 (1999), 7-8, pp. 498-507
  11. Xie, G. et al., Augmented Heat Transfer of an Internal Blade Tip by Full or Partial Arrays of Pin Fins, Heat Transfer Research, 42 (2011), 1, pp. 65-81
  12. Luo, L. et al., Effects of Pin fin Configurations of heat Transfer and Friction factor in an improved Lamilloy Cooling Structure, Heat Transfer Research, 48 (2017), 7, pp. 657-679
  13. Mehendale, S. S., Thermal performance of Pin Fin with unequal Convective Coefficients over its Tip and Surface, Heat Transfer Research, 49 (2018), 13, pp. 1247-1273
  14. Lonshchakov, O. A and Dyakonov, V. G., Heat Transfer in Condensation of Vapors of Binary Mixtures of Partially Soluble Liquids, Heat Transfer Research, 38 (2007), 17, pp. 573-586
  15. Briggs, A., and Rose, J. W., Condensation on Integral-Fin Tubes with special Reference to Effect of Vapor velocity, Heat Transfer Research, 40 (2009), 1, pp. 57-78
  16. Chien, L. H. and Hwang, H. L., An Experimental Study of Boiling Heat transfer Enhancement of Mesh-On-Fin Tubes, Enhanced Heat Transfer, 19 (2012), 1, pp. 75-86
  17. Kang, Y. T. et al., Experimental Investigation of Flooding in a Fluted Tube with and without a Twisted Insert, Enhanced Heat Transfer, 4 (1997), 2, pp. 111-129
  18. Akhavan-Behabadi, M. A. et al., Enhancement of Heat Transfer Rates by Coiled Wires During Forced Convective Condensation of R-22 Inside Horizontal Tubes, Enhanced Heat Transfer, 7 (2000), 2, pp. 69-80
  19. Thome, J. R., High Performance Augmentations for Refrigeration System Evaporators and Condensers, Enhanced Heat Transfer, 1 (1994), 3, pp. 275-285
  20. Honda, H. and Kim, K., Effect of Fin Geometry on the Condensation Heat Transfer Performance of Bundle Horizontal Low-Finned Tubes, Enhanced Heat Transfer, 2 (1995), 1-2, pp. 139-147
  21. Briggs, A. et al., Heat Transfer Measurements for Condensation of Steam on a Horizontal Wire-Wrapped Tube, Enhanced Heat Transfer, 10 (2003), 4, pp. 355-362
  22. Marto, P. J. et al., Film Condensation of steam on horizontal wire wrapped tube, Proceedings, ASME/JSME Thermal Engineering joint Conference, 1987, vol. 1, pp. 509-516
  23. Sethumadhavan, R. and Raja, R. M., Condensation of steam on single start and multi start spiral wire-wound horizontal tubes, Industrial and Engineering Chemistry Process Design and Development, 24 (1985), pp. 783-787
  24. Cesna, B. B., Experimental Study of Heat transfer from Rod Bundle of Wire Wrapped Tubes in Axial Air Flow, Heat Transfer Research, 35 (2004), 7&8, 14 pages
PDF VERSION [DOWNLOAD]
Effect of condensate flow rate, surface tension, density and vapor velocity on condensate retention of wire wrapped tubes

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence