Seyed Alireza Ghazanfari, Malan Abdul Wahid

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Heat transfer rate, pressure loss and efficiency are considered as the most important parameters in designing compact heat exchangers. Despite different types of heat exchangers, fin-and-tube compact heat exchangers are still common device in different industries due to the diversity of usage and the low space installation need. The efficiency of the compact heat exchanger can be increased by introducing the fins and increasing the heat transfer rate between the surface and the surroundings. Numerous modifications can be applied to the fin surface to increase heat transfer. Delta-winglet vortex generators (VGs) are known to enhance the heat transfer between the energy carrying fluid and the heat transfer surfaces in plate-fin-and-tube banks, but they have drawbacks as well. They increase the pressure loss and this should be considered. In this paper, the thermal efficiency of compact heat exchanger with VGs is investigated in different variations. The angle of attack, the length and horizontal and vertical position of winglet are the main parameters to consider. Numerical analyses are carried out to examine finned tube heat exchanger with winglets at the fin surface in a relatively low Reynolds number flow for the inline tube arrangements. The results showed that the length of the winglet significantly affects the improvement of heat transfer performance of the fin-and-tube compact heat exchangers with a moderate pressure loss penalty. In addition, the results show that the optimization cannot be performed for one criterion only. More parameters should be considered at the same time to run the process properly and improve the heat exchanger efficiency.


Compact heat exchangers, parametric study, Vortex generators, Heat transfer enhancement

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Wang, C.-C., Liaw, J.-S., Yang, B.-C., 2011, Airside performance of herringbone wavy fin-and-tube heat exchangers – data with larger diameter tube, International Journal of Heat and Mass Transfer, 54(5–6), pp. 1024–1029.

Yun, R., Kim, Y., Kim, Y., 2009, Air side heat transfer characteristics of plate finned tube heat exchangers with slit fin configuration under wet conditions, Applied Thermal Engineering, 29(14–15), pp. 3014–3020.

Phan, T.-L., Chang, K.S., Kwon, Y.C., Kwon, J.-T., 2011, Experimental study on heat and mass transfer characteristics of louvered fin-tube heat exchangers under wet condition, International Communications in Heat and Mass Transfer, 38(7), pp. 893–899.

Lin, Z.M., Wang, L.B., Zhang, Y.H., 2014, Numerical study on heat transfer enhancement of circular tube bank fin heat exchanger with interrupted annular groove fin, Applied Thermal Engineering, 73(2), pp. 1465–1476.

Joardar, A., Jacobi, A.M., 2008, Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-fin-and-tube heat exchangers, International Journal of Refrigeration, 31(1), pp. 87–97.

Huisseune, H., T’Joen, C., Jaeger, P.De, Ameel, B., Schampheleire, S.De, Paepe, M.De., 2013, Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators, International Journal of Heat and Mass Transfer, 56(1–2), pp. 475–487.

Tian, L., He, Y., Tao, Y., Tao, W., 2009, A comparative study on the air-side performance of wavy fin-and-tube heat exchanger with punched delta winglets in staggered and in-line arrangements, International Journal of Thermal Sciences, 48(9), pp. 1765–1776.

Fiebig., M., 1995, Vortex generators for compact heat exchangers, J. Enhanced Heat Transfer, 2, pp. 43–61.

Jacobi, A.M., Shah, R.K., 1995, Heat transfer surface enhancement through the use of longitudinal vortices: A review of recent progress, Experimental Thermal and Fluid Science, 11(3), pp. 295–309.

Jayavel, S., Tiwari, S., 2010, Effect of tube spacing on heat transfer performance of staggered tube bundles in the presence of vortex generators, Journal of Enhanced Heat Transfer, 17(3), pp. 271–291.

Akbari, M.M., Murata, D.A., Mochizuki, D.S., Saito, H., Iwamoto, K., 2009, Effects of Vortex Generator Arrangements on Heat Transfer Enhancement over a Two-Row Fin-and-Tube Heat ExchangerI, Journal of Enhanced Heat Transfer, 16(4), pp. 315–329.

Joardar, A., Jacobi, a. M., 2007, A Numerical Study of Flow and Heat Transfer Enhancement Using an Array of Delta-Winglet Vortex Generators in a Fin-and-Tube Heat Exchanger, Journal of Heat Transfer, 129(9), pp. 1156-1167.

Hwang, S.W., Kim, D.H., Min, J.K., Jeong, J.H., 2012, CFD analysis of fin tube heat exchanger with a pair of delta winglet vortex generators, Journal of Mechanical Science and Technology, 26(9), pp. 2949–2958.

Lemouedda, A., Breuer, M., Franz, E., Botsch, T., Delgado, A., 2010, Optimization of the angle of attack of delta-winglet vortex generators in a plate-fin-and-tube heat exchanger, International Journal of Heat and Mass Transfer, 53(23–24), pp. 5386–5399.

Wu, J.M., Tao, W.Q., 2011, 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), pp. 2895–2901.

Gorji, M., Mirgolbabaei, H., Barari, A., Domairry, G., Nadim, N., 2011, Numerical analysis on longitudinal location optimization of vortex generator in compact heat exchangers, International Journal for Numerical Methods in Fluids, 66(6), pp. 705–713.

Tiggelbeck, S., Mitra, N.K., Fiebig, M., 1994, Comparison of Wing-Type Vortex Generators for Heat Transfer Enhancement in Channel Flows, Journal of Heat Transfer, 116(4), pp. 880-885.

He, Y.L., Han, H., Tao, W.Q., Zhang, Y.W., 2012, Numerical study of heat-transfer enhancement by punched winglet-type vortex generator arrays in fin-and-tube heat exchangers, International Journal of Heat and Mass Transfer, 55, pp 5449–5458.

Torii, K., Kwak, K.M., Nishino, K., 2002, Heat transfer enhancement accompanying pressure-loss reduction with winglet-type vortex generators for fin-tube heat exchangers, International Journal of Heat and Mass Transfer, 45(18), pp. 3795–3801.

Lin, C.N., Jang, J.Y., 2002, Conjugate heat transfer and fluid flow analysis in fin-tube heat exchangers with wave-type vortex generators, Journal of Enhanced Heat Transfer, 9(3–4), pp. 123–136.

Lin, C.-N., Liu, Y.-W., Leu, J.-S., 2008, Heat Transfer and Fluid Flow Analysis for Plate-Fin and Oval Tube Heat Exchangers With Vortex Generators, Heat Transfer Engineering, 29(7), pp. 588–596.

Jang, J.Y., Hsu, L.F., Leu, J.S., 2013, Optimization of the span angle and location of vortex generators in a plate-fin and tube heat exchanger, International Journal of Heat and Mass Transfer, 67, pp. 432–444.

Dupont, F., Gabillet, C., Bot, P., 2003, Experimental Study of the Flow in a Compact Heat Exchanger Channel With Embossed-Type Vortex Generators, Journal of Fluids Engineering, 125(4), pp. 701-709.

Zhou, G., Ye, Q., 2012, Experimental investigations of thermal and flow characteristics of curved trapezoidal winglet type vortex generators, Applied Thermal Engineering, 37, pp. 241–248.

Tang, L.-H., Min, Z., Xie, G.-N., Wang, Q.-W., 2009, Fin Pattern Effects on Air-Side Heat Transfer and Friction Characteristics of Fin-and-Tube Heat Exchangers with Large Number of Large-Diameter Tube Rows, Heat Transfer Engineering, 30(3), pp. 171–180.

Gholami, A.A., Wahid, M.A., Mohammed, H.A., 2014, Heat transfer enhancement and pressure drop for fin-and-tube compact heat exchangers with wavy rectangular winglet-type vortex generators, International Communications in Heat and Mass Transfer, 54, pp. 132–140.

Jagadeesh, P., Murali, K., 2005, Application of low-re turbulence models for flow simulations past underwater vehicle hull forms, Journal of Naval Architecture and Marine Engineering, 2(1), pp. 41–54.

Ferrouillat, S., Tochon, P., Garnier, C., Peerhossaini, H., 2006, Intensification of heat-transfer and mixing in multifunctional heat exchangers by artificially generated streamwise vorticity, Applied Thermal Engineering, 26(16), pp. 1820–1829.

2016, Ansys Fluent 17.0 Tutorial Guide.

Sanders, P., Thole, K., 2006, Effects of winglets to augment tube wall heat transfer in louvered fin heat exchangers, International Journal of Heat and Mass Transfer, 49(21-22), pp. 4058-4069.

Allison, C., Dally, B., 2007, Effect of a delta-winglet vortex pair on the performance of a tube–fin heat exchanger, International Journal of Heat and Mass Transfer, 50(25–26), pp. 5065–5072.

Gentry, M.C. and Jacobi, A.M., 1997, Heat transfer enhancement by delta-wing vortex generators on a flat plate: Vortex interactions with the boundary layer, Experimental Thermal and Fluid Science, 14(3), pp. 231–242.

Wang, C.-C., Chi, K.-Y., 2000, Heat transfer and friction characteristics of plain fin-and-tube heat exchangers, part I: new experimental data, International Journal of Heat and Mass Transfer, 43(15), pp. 2681–2691.

DOI: https://doi.org/10.22190/FUME180117024G


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ISSN: 0354-2025 (Print)

ISSN: 2335-0164 (Online)

COBISS.SR-ID 98732551

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