Numerical Analysis of Natural Convective Heat Transfer over a Vertical Cylinder Using External Fins

Abstract:

The present numerical study deals with the natural convection heat transfer on the surface of a vertical cylinder with external longitudinal fins. The aim of the study was to determine the effects of geometric parameters like fin height, fin number and fin shape on the heat transfer and thus obtain the optimum parameters that will maximize the rate of heat transfer have been discussed. The numerical investigation consists of an aluminium cylinder of length 1m and diameter 0.07m with air as the working fluid. It has been seen from the numerical investigation that the heat transfer increases with fin height. It is also observed that there exists optimum fin number for maximum heat transfer. Keeping the fin number, fin height and volume fixed, it was found that the heat transfer is maximum for rectangular shaped fin.

• Periodical: Applied Mechanics and Materials (Volumes 813-814)
• Pages: 707-712
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.813-814.707
• Online since: November 2015
• Authors: Anwesha Panigrahi*, D.P. Mishra, Deepak Kumar
• Keywords: Cylinder, Fins, Natural Convection, Nusselt Number

References

[1] Starner K.E. and McManus H.N., An Experimental Investigation of Free Convection Heat Transfer from Rectangular Fin Arrays, Journal of Heat Transfer, 273-278, (1963).

DOI: 10.1115/1.3686097

[2] We lling J.R. and Wooldridge C.N., Free Convection Heat Transfer Coefficients from Vertical Fins, Journal of Heat Transfer, 439-444, (1965).

DOI: 10.1115/1.3689135

[3] Fitzroy N.D., Optimum Spacing of Fins Cooled by Free Convection, Journal of Heat Transfer, 462-463, (1971).

DOI: 10.1115/1.3449846

[4] Aziz, A., Optimum Dimensions of Extended Surfaces Operating in a Convective Environment, Appl. Mech. Rev. 45, 155-173, (1992).

DOI: 10.1115/1.3119754

[5] Leung C.W., et al., Heat Exchanger Design: Thermal Performances of Rectangular Fins Protruding from Vertical or Horizontal Rectangular Bases, Applied Energy, 123-140, (1985).

DOI: 10.1016/0306-2619(85)90029-7

[6] Yüncü H. and Güvenc A., An Experimental Investigation on Performance of Rectangular Fins on a Vertical Base in Free Convection Heat Transfer, Heat and Mass Transfer, 409-416, (2001).

DOI: 10.1007/s002310000139

[7] Yüncü H. and Mobedi M., A Three Dimensional Numerical Study on Natural Convection Heat Transfer from Short Horizontal Rectangular Fin Array, Heat and Mass Transfer, (2003).

DOI: 10.1007/s00231-002-0360-5

[8] Jeong et al., Natural convection heat transfer estimation from a longitudinally finned vertical pipe using CFD, Mechanical Science and Technology, 1517-1527, (2009).

DOI: 10.1007/s12206-009-0406-4

[9] A. A. Avramenko et al., Hydrodynamics and heat transfer of a water flow with supercritical parameters in a vertical assembly of fuel elements, Engineering Physics and Thermophysics (2013).

DOI: 10.1007/s10891-013-0899-7