Enhanced heat transfer in rectangular duct with punched winglets

doi:10.1016/j.cjche.2019.09.012

Abstract

Abstract: Thermal performance of a heat exchanger duct with punched winglets (PWs) mounted on the upper duct wall has been examined for Reynolds number (Re) ranging from 4100 to 25,500. In the present experiment, two types of PWs: punched delta- and elliptical-winglets (P-DW and P-EW) with four punched-hole sizes were tested at a fixed attack angle, optimal relative pitch and height. Also, data of solid delta- and elliptical-winglets (DW and EW) were included for comparison. The investigation has shown that the P-DW yields higher thermal-performance enhancement factor (η) than the P-EW. Although the solid DW and EW with no punch have the highest heat transfer and friction loss, the PWs yield better η than the solid ones. For PWs, the P-DW with smaller hole size has the peak heat transfer and friction loss around 5.7 and 40 times over the smooth duct, respectively but the optimum η of 2.17 is seen for the one with a certain hole size. The PWs provide η at about 5%-8% above the solid winglets.

Key words: Heat exchanger, Winglet, Flow resistance, Thermal-performance enhancement factor, Vortex generator

摘要： Thermal performance of a heat exchanger duct with punched winglets (PWs) mounted on the upper duct wall has been examined for Reynolds number (Re) ranging from 4100 to 25,500. In the present experiment, two types of PWs: punched delta- and elliptical-winglets (P-DW and P-EW) with four punched-hole sizes were tested at a fixed attack angle, optimal relative pitch and height. Also, data of solid delta- and elliptical-winglets (DW and EW) were included for comparison. The investigation has shown that the P-DW yields higher thermal-performance enhancement factor (η) than the P-EW. Although the solid DW and EW with no punch have the highest heat transfer and friction loss, the PWs yield better η than the solid ones. For PWs, the P-DW with smaller hole size has the peak heat transfer and friction loss around 5.7 and 40 times over the smooth duct, respectively but the optimum η of 2.17 is seen for the one with a certain hole size. The PWs provide η at about 5%-8% above the solid winglets.

关键词: Heat exchanger, Winglet, Flow resistance, Thermal-performance enhancement factor, Vortex generator

Pongjet Promvonge, Sompol Skullong. Enhanced heat transfer in rectangular duct with punched winglets[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 660-671.

Pongjet Promvonge, Sompol Skullong. Enhanced heat transfer in rectangular duct with punched winglets[J]. 中国化学工程学报, 2020, 28(3): 660-671.

References

[1] I.T. Togrul, D. Pehlivan, The performance of a solar air heater with conical concentrator under forced convection, Int. J. Therm. Sci. 42(2003) 571-581.
[2] P. Promvonge, Heat transfer and pressure drop in a channel with multiple 60° V-baffles, Int. Commun. Heat Mass Transf. 37(7) (2010) 835-840.
[3] S. Skullong, P. Promvonge, C. Thianpong, N. Jayranaiwachira, M. Pimsarn, Heat transfer augmentation in a solar air heater channel with combined winglets and wavy grooves on absorber plate, Appl. Therm. Eng. 122(2017) 268-284.
[4] S. Skullong, Performance enhancement in a solar air heater duct with inclined ribs mounted on the absorber, J Res. Appl. Mech. Eng. 5(2017) 55-64.
[5] S. Skullong, P. Promthaisong, P. Promvonge, C. Thianpong, M. Pimsarn, Thermal performance in solar air heater with perforated-winglet-type vortex generator, Sol. Energy 170(2018) 1101-1117.
[6] A. Kumar, A. Layek, Thermo-hydraulic performance of solar air heater having twisted rib over the absorber plate, Int. J. Therm. Sci. 133(2018) 181-195.
[7] S. Eiamsa-ard, P. Promvonge, Influence of double-sided delta-wing tape insert with alternate-axes on flow and heat transfer characteristics in a heat exchanger tube, Chin. J. Chem. Eng. 19(3) (2011) 410-423.
[8] S. Eiamsa-ard, N. Koolnapadol, P. Promvonge, Heat transfer behavior in a square duct with tandem wire coil element insert, Chin. J. Chem. Eng. 20(5) (2012) 863-869.
[9] S. Skullong, S. Kwankaomeng, C. Thianpong, P. Promvonge, Thermal performance of turbulent flow in a solar air heater channel with rib-groove turbulators, Int. Commun. Heat Mass Transf. 50(2014) 34-43.
[10] P. Promvonge, Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes, Appl. Therm. Eng. 91(2015) 298-307.
[11] W. Noothong, S. Suwannapan, C. Thianpong, P. Promvonge, Enhanced heat transfer in a heat exchanger square-duct with discrete V-finned tape inserts, Chin. J. Chem. Eng. 23(2015) 490-498.
[12] S. Chokphoemphun, M. Pimsarn, C. Thianpong, P. Promvonge, Heat transfer augmentation in a circular tube with winglet vortex generators, Chin. J. Chem. Eng. 23(2015) 605-614.
[13] S. Chokphoemphun, M. Pimsarn, C. Thianpong, P. Promvonge, Thermal performance of tubular heat exchanger with multiple twisted-tape inserts, Chin. J. Chem. Eng. 23(2015) 755-762.
[14] S. Skullong, P. Promvonge, N. Jayranaiwachira, C. Thianpong, Experimental and numerical heat transfer investigation in a tubular heat exchanger with delta-wing tape inserts, Chem. Eng. Process. Process Intensif. 109(2016) 164-177.
[15] M. Awais, A.A. Bhuiyan, Heat and mass transfer for compact heat exchanger (CHXs) design:A state-of-the-art review, Int. J. Heat Mass Transf. 127(2018) 359-380.
[16] M. Awais, A.A. Bhuiyan, Heat transfer enhancement using different types of vortex generators (VGs):A review on experimental and numerical activities, Therm. Sci. Eng. Progress 5(2018) 524-545.
[17] H.L. Liu, H. Li, Y.L. He, Z.T Chen, Heat transfer and flow characteristics in a circular tube fitted with rectangular winglet vortex generators, Int. J. Heat Mass Transf. 126(2018) 989-1006.
[18] H.L. Liu, C.C. Fan, Y.L. He, D.S. Nobes, Heat transfer and flow characteristics in a rectangular channel with combined delta winglet inserts, Int. J. Heat Mass Transf. 134(2019) 149-165.
[19] M. Awais, A.A. Bhuiyan, Enhancement of thermal and hydraulic performance of compact finned-tube heat exchanger using vortex generators (VGs):A parametric study, Int. J. Therm. Sci. 140(2019) 154-166.
[20] C.W. Leung, S. Chen, T.T. Wong, S.D. Probert, Forced convection and pressure drop in a horizontal triangular-sectional duct with V-grooved (i.e. orthogonal to the mean flow) inner surfaces, Appl. Energy 66(2000) 199-211.
[21] S. Skullong, C. Thianpong, P. Promvonge, Effects of rib size and arrangement on forced convective heat transfer in a solar air heater channel, Heat Mass Transf. 51(2015) 1475-1485.
[22] P. Promvonge, S. Skullong, S. Kwankaomeng, C. Thiangpong, Heat transfer in square duct fitted diagonally with angle-finned tape-Part 1:Experimental study, Int. Commun. Heat Mass Transf. 39(2012) 617-624.
[23] A. Priyam, P. Chand, Thermal and thermohydraulic performance of wavy finned absorber solar air heater, Sol. Energy 130(2016) 250-259.
[24] D. Sahel, H. Ameur, R. Benzeguir, Y. Kamla, Enhancement of heat transfer in a rectangular channel with perforated baffles, Appl. Therm. Eng. 101(2016) 156-164.
[25] P. Promvonge, S. Kwankaomeng, Periodic laminar flow and heat transfer in a channel with 45° staggered V-baffles, Int. Commun. Heat Mass Transf. 37(2010) 841-849.
[26] S. Skullong, P. Promvonge, C. Thianpong, M. Pimsarn, Thermal performance in solar air heater channel with combined wavy-groove and perforated-delta wing vortex generators, Appl. Therm. Eng. 100(2016) 611-620.
[27] M. Fiebig, Embedded vortices in internal flow:heat transfer and pressure loss enhancement, Int. J. Heat Fluid Flow 16(1995) 376-388.
[28] D.X. Jin, Y.P. Lee, D.-Y. Lee, Effects of the pulsating flow agitation on the heat transfer in a triangular grooved channel, Int. J. Heat Mass Transf. 50(2007) 3062-3071.
[29] S. Eiamsa-ard, P. Promvonge, Numerical study on heat transfer of turbulent channel flow over periodic grooves, Int. Commun. Heat Mass Transf. 35(2008) 844-852.
[30] X.-Y. Tang, G. Jiang, G. Cao, Parameters study and analysis of turbulent flow and heat transfer enhancement in narrow channel with discrete grooved structures, Chem. Eng. Res. Des. 93(2015) 232-250.
[31] H.H. Xia, G.H. Tang, Y. Shi, W.Q. Tao, Simulation of heat transfer enhancement by longitudinal vortex generators in dimple heat exchangers, Energy 74(2014) 27-36.
[32] J. Liu, Y. Song, G. Xie, B. Sunden, Numerical modeling flow and heat transfer in dimpled cooling channels with secondary hemispherical protrusions, Energy 79(2015) 1-19.
[33] P. Promvonge, C. Thianpong, Thermal performance assessment of turbulent channel flows over different shaped ribs, Int. Commun. Heat Mass Transf. 35(2008) 1327-1334.
[34] C. Thianpong, T. Chompookham, S. Skullong, P. Promvonge, Thermal characterization of turbulent flow in a channel with isosceles triangular ribs, Int. Commun. Heat Mass Transf. 36(2009) 712-717.
[35] R. Karwa, Experimental studies of augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated wall in transverse, inclined, V-continuous and V-discrete pattern, Int. J. Heat Mass Transf. 30(2) (2003) 241-250.
[36] N.K. Pandey, V.K. Bajpai, Varun, Experimental investigation of heat transfer augmentation using multiple arcs with gap on absorber plate of solar air heater, Sol. Energy 134(2016) 314-326.
[37] S. Tamna, S. Skullong, C. Thianpong, P. Promvonge, Heat transfer behaviors in a solar air heater channel with multiple V-baffle vortex generators, Sol. Energy 110(2014) 720-735.
[38] M.C. Gentry, A.M. Jacobi, Heat transfer enhancement by delta-wing vortex generators on a flat plate:vortex interactions with the boundary layer, Exp. Thermal Fluid Sci. 14(1997) 231-242.
[39] G. Zhou, Q. Ye, Experimental investigations of thermal and flow characteristics of curved trapezoidal winglet type vortex generators, Appl. Therm. Eng. 37(2012) 241-248.
[40] G. Zhou, Z. Feng, Experimental investigations of heat transfer enhancement by plane and curved winglet type vortex generators with punched holes, Int. J. Therm. Sci. 78(2014) 26-35.
[41] S. Skullong, P. Promvonge, Experimental investigation on turbulent convection in solar air heater channel fitted with delta winglet vortex generator, Chin. J. Chem. Eng. 22(1) (2014) 1-10.
[42] P. Promvonge, T. Chompookham, S. Kwankaomeng, C. Thianpong, Enhanced heat transfer in a triangular ribbed channel with longitudinal vortex generators, Energy Convers. Manag. 51(2010) 1242-1249.
[43] T. Chompookham, C. Thianpong, S. Kwankaomeng, P. Promvonge, Heat transfer augmentation in a wedge-ribbed channel using winglet vortex generators, Int. Commun. Heat Mass Transf. 37(2010) 163-169.
[44] P. Promvonge, C. Khanoknaiyakarn, S. Kwankaomeng, C. Thianpong, Thermal behavior in solar air heater channel fitted with combined rib and delta-winglet, Int. Commun. Heat Mass Transf. 38(2011) 749-756.
[45] F. Incropera, P.D. Dewitt, Introduction to Heat Transfer 5th edition, John Wiley & Sons Inc., 2006
[46] ASME, Standard measurement of fluid flow in pipes using orifice, nozzle and venturi. ASME MFC-3M-1984, United engineering center 345 east 47th street, N. Y., (1984) 1-56.
[47] P. Promvonge, S. Skullong, Heat transfer in solar receiver heat exchanger with combined punched-V-ribs and chamfer-V-grooves, Int. J. Heat Mass Transf. 143(2019), 118486.
[48] R.L. Webb, Principles of Enhanced Heat Transfer, second edition Taylor & Francis, New York, 2005.
[49] ANSI/ASME, Measurement uncertainty, PTC 19, vols. 1-1985, Part I, USA, 1986.