Commenced in January 2007
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Edition: International
Paper Count: 30073
Performance Improvement in Internally Finned Tube by Shape Optimization

Authors: Kyoungwoo Park, Byeong Sam Kim, Hyo-Jae Lim, Ji Won Han, Park Kyoun Oh, Juhee Lee, Keun-Yeol Yu

Abstract:

Predictions of flow and heat transfer characteristics and shape optimization in internally finned circular tubes have been performed on three-dimensional periodically fully developed turbulent flow and thermal fields. For a trapezoidal fin profile, the effects of fin height h, upper fin widths d1, lower fin widths d2, and helix angle of fin ? on transport phenomena are investigated for the condition of fin number of N = 30. The CFD and mathematical optimization technique are coupled in order to optimize the shape of internally finned tube. The optimal solutions of the design variables (i.e., upper and lower fin widths, fin height and helix angle) are numerically obtained by minimizing the pressure loss and maximizing the heat transfer rate, simultaneously, for the limiting conditions of d1 = 0.5~1.5 mm, d2 = 0.5~1.5 mm, h= 0.5~1.5mm, ? = 10~30 degrees. The fully developed flow and thermal fields are predicted using the finite volume method and the optimization is carried out by means of the multi-objective genetic algorithm that is widely used in the constrained nonlinear optimization problem.

Keywords: Computational fluid dynamics, Genetic algorithm, Internally finned tube with helix angle, Optimization.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071798

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References:


[1] H.Y. Pak, K. Park, and M.S. Choi, "Numerical Analysis of the Flow and Heat Transfer Characteristics for Forced Convection-Radiation in Entrance Region of an Internally Finned Tubes," KSME Int. J., Vol. 12 no. 2, 1998, pp. 310~319.
[2] X.Liu, and M.K. Jensen, "Geometry Effects on Turbulent Flow and Heat Transfer in Internally Finned Tubes," ASME J. of Heat Transfer, Vol.123, 2001, pp. 1035~1044.
[3] G. Fabbri, "Heat Transfer Optimization in Internally Finned Tubes Under Laminar Flow Conditions, Int. J. of Heat and Mass Transfer, Vol.41, No.10, 1998, pp.1243-1253.
[4] J. Lee, J, S. Lee, and K. Park, , Flow/Heat Transfer Analysis and Shape Optimization of a Heat Exchanger with Internally Finned Tube, Trans, of the KSME (B), Vol.29, No.4, 2005, pp.1620-1629.
[5] Sanghwan Lee ,Juhee Lee, Kyoungwoo Park, An Application of Multi-Objective Global Optimization Technique For Internally Finned Tube, Korean Journal of Air- Conditioning and Refrigeration Engineering, Vol 17, No. 10, 2005, pp. 938-946.
[6] A.C.Poloni, A. Giurgevich, L Onesti, and V.Pediroda, Hybridisation of a Multi-Objective Genetic Algorithm, a Neural Network and a Classical Optimizer for a Complex Design Problem in Fluid Dynamics, Dipartimento diEnergetica Universita di Trieste, Italy, 1999.
[7] D.Goldberg, Genetic Algorithms in Search, Optimization and Machine Learning, Addition-Wesley, 1989.
[8] Z. Michalewicz, Genetic Algorithms + Data Structures = Evolution Programs, Springer-Verlog, , 1992.
[9] L.B. Booker, Improving Search in Genetic Algorithms", in Davis L(Editor), "Genetic Algorithms and Simulated Annealing, Morgan Kaufmann Publishers, Los Altos, CA, 1987.
[10] J.D. Schaffer, "Multiple objective optimization with vector evaluated genetic algorithms", Proc. First Int. Conf. on Genetic Algorithms, pp. 93-100, 1985,.
[11] S. V.Patankar, C. H. Liu, and E. M. Sparrow, "Fully Developed Flow and Heat Transfer in Ducts Having Streamwise-Periodic Variations of Cross-Sectional Area", ASME J. of Heat Transfer, Vol. 99, 1977, pp. 180~186.
[12] W. Rodi, Turbulence models and their applications in hydraulics - a state-art-of review, Book Publication of International Association for Hydraulic Research, Delft, Netherlands, 1984.
[13] L. H.Norris and W. C. Reynolds, Turbulent Channel Flow with a Moving Wavy Boundary, Report. FM-10, Department of Mechanical Engineering, Stanford University, CA, 1975.
[14] STAR-CD Manual, 2001, Computational Dynamics, Co., London. U. K.
[15] J. P. Holman, Heat Transfer, McGraw-Hill Book Company, pp. 274~278, 1986.