Flow and Thermal Analyses for the Optimal Specification of Flat Tube at Radiator

Title & Authors
Flow and Thermal Analyses for the Optimal Specification of Flat Tube at Radiator
Park, Kyoung-Woo; Pak, Hi-Yong;

Abstract
The flow and thermal phenomena in flat tubes of radiator are analyzed numerically. To predict the characteristics of heat transfer and pressure drop, the flow analysis program for three-dimensional complex geometry is developed, which adopted an non-staggered grid system and Cartesian velocities as dependent variables of the momentum equations. Using the developed program, the effect of tube specifications on the heat transfer characteristics is investigated for various flat tubes. From this study, the following results are obtained; (1) For the same hydraulic diameter($\small{D_h{\doteq}5.2}$mm), the Nusselt numbers of three basic modeis(D, J, and H-model) are 8.71, 8.92, and 10.58, respectively, and the pressure drops of D-, J-, and H-model are predicted as $\small{-3.08{\times}10^{-2}\;Pa,\;-3.12{\times}10^{-2}\;Pa,\;and\; -3.98{\times}10^{-2}}$ Pa, (2) In case of the same flat tube specification, the fins must be brazed at upper tube surface because the heat is more vividly transferred. Therefore, it is found that the H- model is the most effective tube as a heat exchanger and these results are used as a fundamental data for the design of tube.
Keywords
Radiator;Flat Tube;Three Dimensional Complex Geometry;Numerical Analysis;Heat Transfer;Pressure Drop;
Language
Korean
Cited by
1.
임의형상을 갖는 납작관에서의 혼합대류 열전달 해석,박희용;박경우;이상철;

설비공학논문집, 2001. vol.13. 5, pp.398-410
References
1.
Davenport, C.J. 1983, 'Heat Transfer and Flow Friction Characteristics of Louvered Heat Exchanger Surfaces,' Heat Exchangers : Theory and Practices, Hemisphere Publishing

2.
Achaicha, A. and Cowell, T. A., 1992, ' Heat Transfer and Pressure Drop Characteristics of Flat Tube and Louvered Plate Fin Surfaces,' Experimental Thermal and Fluid Science, Vol. 1, pp. 147-157

3.
Sunden, B. and Svantesson, J., 1992,,' Correlations of j and f Factors for Multilouvered Heat Transfer Surfaces,' 1st European Conference on Thermal Sciences, Vol. 2, pp. 805 - 811

4.
Suga, K., 1991, ' Numerical Study on Heat Transfer and Pressure Drop in Multilouvered Fins,' ASME/JSME Thermal Engineering Proceedings, Vol. 4, pp, 361-368

5.
Farrel, P. and Wert, K. and Webb, R., 1989, 'Heat Transfer and Friction Characteristics of Turbulent Radiator Tubes,' SAE Technical Papers

6.
Hsu, F. H., 1981, ' A Curvilinear-Coordinate Method for Momentum, Heat and Mass Transfer in Domains of Irregular Geometry', Ph.D. thesis, University of Minnesota, Minneapolis

7.
Shyy, W., Tong, S. S. and Correa, S. M., 1985, ' Numerical Recirculating Flow Calculations Using a Body-Fitted Coordinate System, ' Numerical Heat transfer, Part A, Vol. 8, pp. 99-113

8.
Karki, K. C. and Patankar, S. V., 1988, ' Calculation Procedure for Viscous Incompressible Flows in Complex Geometry, ' Numerical Heat Transfer, Part A, vol. 14, pp. 295-307

9.
Rhie, C. M. and Chow, W. L., 1983, 'Numerical Study of the Turbulent Flow Past an Airfoil with Trailing Edge Separation, ' AIAA J., Vol. 11, pp. 1525-1532

10.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere, Washington, D. C.

11.
Kyoung Woo Park and Hi Yong Pak, 2000, 'Characteristics of Three-Dimensional Flow, Heat, and Mass Transfer in a Chemical Vapour Deposition Reactor, ' Numerical Heat Transfer, Part A, Vol. 37, No.4, pp. 407-423

12.
오성진, 박 경우, 김기문, 박희용, 1998, '수평 CVD반응기에서의 3차원 혼합대류 열전달특성,' 대한기계학회논문집 B권, 제22권, 제5호, pp. 672-684