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ISSN Imprimer: 1065-5131
ISSN En ligne: 1563-5074
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1.8
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0.2
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0.00037
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Numerical Investigations on Enhancement of Heat Transfer in a Compact Fin-and-Tube Heat Exchanger Using Delta Winglet Type Vortex Generators
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RÉSUMÉ
Three dimensional flow and heat transfer in a compact fin-tube cross flow heat exchanger have been modeled as the flow in a rectangular channel with built-in cylindrical obstacles. The flow past a tube bank has been simulated by a spacewise periodic fully developed flow in a computational domain consisting of a channel element with one tube. Flow and temperature fields in this element and in another element with two in-line tubes have been computed from the numerical solution of three dimensional Navier-Stokes and energy equations. Comparison of results show that at low Reynolds number (∼ 400) the Nusselt number in the neighborhood of the second tube of a two tube in-line configuration is close to the Nusselt number for spacewise periodic fully developed flow. Computational results also show poor heat transfer in the wake region. In the presence of the winglet type longitudinal vortex generators in the wake behind the cylinder, heat transfer in this region is enhanced significantly. Results show increases in average Nusselt number due to the vortex generators can be between 20 and 50 percent in the Reynolds number range of 400 and 1200. A factor, defined as the ratio of increase in Nusselt number to increase in friction factor, of 0.65 to 0.78 can be obtained, over the range of Reynolds number mentioned above.
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Wu J.M., Tao W.Q., Investigation on laminar convection heat transfer in fin-and-tube heat exchanger in aligned arrangement with longitudinal vortex generator from the viewpoint of field synergy principle, Applied Thermal Engineering, 27, 14-15, 2007. Crossref
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Wu J.M., Zhang H., Yan C.H., Wang Y., Experimental study on the performance of a novel fin-tube air heat exchanger with punched longitudinal vortex generator, Energy Conversion and Management, 57, 2012. Crossref
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Goldstein R.J., Eckert E.R.G., Ibele W.E., Patankar S.V., Simon T.W., Kuehn T.H., Strykowski P.J., Tamma K.K., Bar-Cohen A., Heberlein J.V.R., Davidson J.H., Bischof J., Kulacki F.A., Kortshagen U., Garrick S., Heat transfer – a review of 1999 literature, International Journal of Heat and Mass Transfer, 44, 19, 2001. Crossref
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Joardar A., Jacobi A.M., Impact of leading edge delta-wing vortex generators on the thermal performance of a flat tube, louvered-fin compact heat exchanger, International Journal of Heat and Mass Transfer, 48, 8, 2005. Crossref
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Wu J.M., Tao W.Q., Impact of delta winglet vortex generators on the performance of a novel fin-tube surfaces with two rows of tubes in different diameters, Energy Conversion and Management, 52, 8-9, 2011. Crossref
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Wang Ye, Wang Liang-Chen, Lin Zhi-Min, Yao Yu-Huan, Wang Liang-Bi, The condition requiring conjugate numerical method in study of heat transfer characteristics of tube bank fin heat exchanger, International Journal of Heat and Mass Transfer, 55, 9-10, 2012. Crossref
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Fan Ju-Fang, He Ya-Ling, Tao Wen-Quan, Application of Combined Enhanced Techniques for Design of Highly Efficient Air Heat Transfer Surface, Heat Transfer Engineering, 33, 1, 2012. Crossref
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Song W.M., Meng J.A., Li Z.X., Numerical study of air-side performance of a finned flat tube heat exchanger with crossed discrete double inclined ribs, Applied Thermal Engineering, 30, 13, 2010. Crossref
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Saha Pankaj, Biswas Gautam, Sarkar Subrata, Comparison of winglet-type vortex generators periodically deployed in a plate-fin heat exchanger – A synergy based analysis, International Journal of Heat and Mass Transfer, 74, 2014. Crossref
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Wang Liang-Chen, Su Mei, Hu Wan-Ling, Lin Zhi-Min, Wang Liang-Bi, Wang Ye, The Characteristic Temperature in the Definition of Heat Transfer Coefficient on the Fin Side Surface in Tube Bank Fin Heat Exchanger, Numerical Heat Transfer, Part A: Applications, 60, 10, 2011. Crossref
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Wu Xiang, Lin Zhi-Min, Liu Song, Su Mei, Wang Liang-Chen, Wang Liang-Bi, Experimental study on the effects of fin pitches and tube diameters on the heat transfer and fluid flow characteristics of a fin punched with curved delta-winglet vortex generators, Applied Thermal Engineering, 119, 2017. Crossref
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Modi Ashish J., Rathod Manish K., Comparative study of heat transfer enhancement and pressure drop for fin-and-circular tube compact heat exchangers with sinusoidal wavy and elliptical curved rectangular winglet vortex generator, International Journal of Heat and Mass Transfer, 141, 2019. Crossref
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Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Circular Fins with Staggered Tubes, Low Integral Fin Tubes, in Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli, 2020. Crossref