Numerical analysis of a channel flow with two tubes in a vertical plain-fin type heat exchanger
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Natural convection heat transfer in a channel flow is investigated to determine the maximum performance of a plain-fin type heat exchanger with two tubes. A vertical channel flow with isothermal heated surfaces is evaluated using Rayleigh numbers, the plate-fin aspect ratios, and pitches between two vertical plates. The channel flow had two horizontal heated tubes. The finite volume method was selected as a numerical tool. When W, the dimensionless ratio between the height and width of the plate, was changed from 1.0 to 0.8, the heat-dissipation performance increased. At small Rayleigh numbers, the dimensionless plain-fin ratio was not an important factor. In the cases of different geometry ratios with the same plain-fin area, the heat dissipation rate increased when the horizontal length increased. On the same-volume basis, the total heat transfer rates increased. Thus, smaller pitches are recommended when considering the flow pattern. Finally, the optimum design arrangements are suggested to obtain the maximum thermal performance in a plain-fin type heat exchanger.
Abstract
Natural convection heat transfer in a channel flow is investigated to determine the maximum performance of a plain-fin type heat exchanger with two tubes. A vertical channel flow with isothermal heated surfaces is evaluated using Rayleigh numbers, the plate-fin aspect ratios, and pitches between two vertical plates. The channel flow had two horizontal heated tubes. The finite volume method was selected as a numerical tool. When W, the dimensionless ratio between the height and width of the plate, was changed from 1.0 to 0.8, the heat-dissipation performance increased. At small Rayleigh numbers, the dimensionless plain-fin ratio was not an important factor. In the cases of different geometry ratios with the same plain-fin area, the heat dissipation rate increased when the horizontal length increased. On the same-volume basis, the total heat transfer rates increased. Thus, smaller pitches are recommended when considering the flow pattern. Finally, the optimum design arrangements are suggested to obtain the maximum thermal performance in a plain-fin type heat exchanger.
참고문헌 (10)
- G. J. Huang, "Enhancement of natural convection heat transfer from horizontal rectangular fin arrays with perforations in fin base", International Journal of Thermal Sciences, 84, pp.164~174 (2014)
- P. H. Oosthuizen, "Natural convective heat transfer from a narrow vertical flat plate", Proceedings of the 9th AIAA Conf, pp.1~8 (2006)
- M. Ahmadi, "Natural convection from vertical parallel plates: An integral method solution", Journal of Thermophysics and Heat Transfer, 29(1), pp.140~149 (2015)
- H. Nemati, "Numerical investigaton of natural convection heat transfer over annular finned horizontal cylinder", International Journal of Heat and Mass Transfer, 96, pp.330~345 (2016)
- S. Yildiz, "An experimental investigation on performance of annular fins on a horizontal cylinder in free convection heat transfer", Heat and Mass Transfer, pp.239~251 (2004)
- H. Chen, "Numerical and experimental study of natural convection heat transfer characteristics for vertical plate fin and tube heat exchangers with various tube diameters", International Journal of Heat and Mass Transfer, 100, pp.320~331 (2016)
- 김종수, "Analysis of the experimental cooling performance of a high-power light-emitting diode package with a modified crevice-type vapor chamber heat pipe", 한국마린엔지니어링학회지, 39(8), pp.801~806 (2015), 한국마린엔지니어링학회[DOI]
- S. W. Churchill, "Correlating equations for laminar and turbulent free convection from horizontal cylinder", International Journal of Heat and Mass Transfer, 18(9), pp.1049~1053 (1975)
- V. T. Morgan, "Advances in Heat Transfer, vol. 11", pp.199~264 (1975), Academic Press