Experimental Investigations on Single-Phase Heat Transfer Enhancement in an Air-To-Water Heat Exchanger with Rectangular Perforated Flow Deflector Baffle Plate

Year 2023, Volume: 26 Issue: 4, 31 - 39, 01.12.2023

Atıqur Rahman

https://doi.org/10.5541/ijot.1285385

Cited By: 13

Abstract

Experimental analysis was conducted to investigate the turbulent heat transfer behaviors within a tubular heat exchanger, incorporating a novel baffle plate design. The new design includes a perforated circular baffle plate with a rectangular flow deflector that can be adjusted to different inclination angles. The baffle plate is strategically positioned at the entrance of the heat exchanger, resulting in a swirling flow downstream. To assess the impact of the baffle plate design, three baffle plates were placed longitudinally along the flow, with varying pitch ratios (l/D). The effects of pitch ratio (ranging from 0.6 to 1.2), deflector inclination angle (ranging between 30⁰ to 50⁰), and Reynolds numbers (ranging between 16000 to 29000) were examined. The outcomes highlighted the substantial impact of pitch ratio and inclination angle on the thermal enhancement factor. In particular, compared to single segmental baffle plates working under similar operating conditions. The result indicates that an inclination angle of 30° and a pitch ratio of 1 exhibited an average 41.49% augmentation in thermal-fluidic performance compared with an exchanger with a segmental baffle plate.

Keywords

thermo-fluid performence, swirl flow device, passive heat transfer, deflector baffle plate, turulators

References

• R.I.Webb, Principles of Enhanced heat transfer, 1st Ed. New York: John Wiley-Interscience, 1994.
• A.E. Bergles, “Heat transfer enhancement – the encouragement and accommodation of high heat fluxes,” J. Heat transfer., 119, 8–19, 1997, https://doi.org/10.1115/1.2824105
• M.Sheikholeslami, M.Gorji-Bandpy, D.D.Ganji, “Review of heat transfer enhancement methods: Focus on passive methods using swirl flow devices,” Renew. Sustain. Energy Rev, 49, 444–469, 2015, https://doi.org/10.1016/j.rser.2015.04.113
• B.N.Prasad, J.S.Saini, “Effect of artificial roughness on heat transfer and friction factor in a solar air heater,” Sol Energy., 41,555–60, 1988, https://doi.org/10.1016/0038-092X(88)90058-8
• B.N.Prasad, J.S.Saini, “Optimal thermohydraulic performance of artificially roughened solar air heaters,” Solar., 47, 91–6, 1991, https://doi.org/10.1016/0038-092X(91)90039-Y
• B.N.Prasad, A.Kumar, K.D.P.Singh, “Optimization of thermo hydraulic performance in three sides artificially roughened solar air heaters,” Sol Energy., 111,313–9, 2015, https://doi.org/10.1016/j.solener.2014.10.030
• B.Lu, P.X.Jiang, “Experimental and numerical investigation of convection heat transfer in a rectangular channel with angled ribs,” Exp Therm Fluid Sci., 30,513–21, 2006, https://doi.org/10.1016/j.expthermflusci.2005.09.007
• J.Liu, J.Gao, T.Gao, X.Shi, “Heat transfer characteristics in steam-cooled rectangular channels with two opposite rib-roughened walls,” Appl Therm Eng.,50,104–11, 2013, https://doi.org/10.1016/j.applthermaleng.2012.05.003
• P.Sriromreun, C.Thianpong, P.Promvonge, “Experimental and numerical study on heat transfer enhancement in a channel with Z-shaped baffles,” Int Commun Heat Mass Transf., 39,945–52, 2012, https://doi.org/10.1016/j.icheatmasstransfer.2012.05.016
• S.Kwankaomeng, P.Promvonge, “Numerical prediction on laminar heat transfer in square duct with 30° angled baffle on one wall,” Int Commun Heat Mass Transf., 37, 857–66, 2010, https://doi.org/10.1016/j.icheatmasstransfer.2010.05.005
• A.Priyam, P.Chand, “Thermal and thermohydraulic performance of wavy finned absorber solar air heater,” Sol Energy., 130,250–9, 2016, https://doi.org/10.1016/j.solener.2016.02.030
• V.B.Gawande, A.S.Dhoble, D.B.Zodpe, S.Chamoli, “Experimental and CFD investigation of convection heat transfer in solar air heater with reverse L-shaped ribs,” Sol Energy.,131,275–95, 2016, https://doi.org/10.1016/j.solener.2016.02.040
• S.Eiamsa-Ard, A.Phila, M.Pimsarn, “Heat transfer mechanism and thermal performance of a channel with square-wing perforated transverse baffles installed: effect of square-wing location,” J Therm Anal Calorim., 2023, https://doi.org/10.1007/s10973-022-11937-w M. Sanchouli, S. Payan, A. Payan, S.A.Nada, “Investigation of the enhancing thermal performance of phase change material in a double-tube heat exchanger using grid annular fins,” Case Stud. Therm. Eng., 34, 101986, 2022, https://doi.org/10.1016/j.csite.2022.101986
• M.A.Rahman, S.K.Dhiman, “Performance evaluation of turbulent circular heat exchanger with a novel flow deflector-type baffle plate,” J Eng Res., 100105, 2023, https://doi.org/10.1016/j.jer.2023.100105
• M. A. Rahman, S.K.Dhiman, “Investigations of the turbulent thermo-fluid performance in a circular heat exchanger with a novel flow deflector-type baffle plate,” Bull. Pol. Acad. Sci.: Tech., 2023, doi: 10.24425/bpasts.2023.145939
• T.Alam, M.Kim, “Numerical study on thermal hydraulic performance improvement in solar air heater duct with semi ellipse shaped obstacles,” Energy., 112,588–98, 2016, http://dx.doi.org/10.1016/j.energy.2016.06.105
• J. Guo, A.W. Fan, X.Y. Zhang, W. Liu, “A numerical study on heat transfer and friction factor characteristics of laminar flow in a circular tube fitted with center-cleared twisted tape,” Int. J. Therm Sci., 50, 1263–1270, 2011, https://doi.org/10.1016/j.ijthermalsci.2011.02.010
• C.Thianpong, P.Eiamsa-ard, K.Wongcharee, S.Eiamsa-ard , “Compound heat transfer enhancement of a dimpled tube with a twisted tape swirl generator,” Int Commun Heat Mass Transf.,36,698–704, 2009,https://doi.org/10.1016/j.icheatmasstransfer.2009.03.026
• E.Esmaeilzadeh, H.Almohammadi, A.Nokhosteen, A.Motezaker , A.N.Omrani ,“Study on heat transfer and friction factor characteristics of Al2O3 water through circular tube with twisted tape inserts with different thicknesses,” Int J Therm Sci., 82, 72–83, 2014, https://doi.org/10.1016/j.ijthermalsci.2014.03.005
• M.M.K.Bhuiya, A.S.M.Sayem, M.Islam, M.S.U.Chowdhury, M.Shahabuddin, “Performance assessment in a heat exchanger tube fitted with double counter twisted tape inserts,” Int Commun Heat Mass Transf.,50,25–33,2014, https://doi.org/10.1016/j.icheatmasstransfer.2013.11.005
• A.Durmus, M.Esen, “Investigation of heat transfer and pressure drop in a concentric heat exchanger with snail entrance,” Appl Therm Eng., 22(3), 321–32, 2002, https://doi.org/10.1016/S1359-4311(01)00078-3
• ASHRAE Handbook-Fundamental, Principles of Heating, Ventilation and Air-conditioning Engineers, 8th Ed. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., chap. 13, 14–15, 1993.
• H.W.Coleman,W.G. Steele, Experimentation, validation, and uncertainty analysis for engineers, 4th Ed. New York: John Wiley & Sons, 2018.
• J.D.Holmes, Wind Loading of Structures, 2nd Ed. New York: Taylor & Francis, 168-169, 2007.
• Y.Z.Cao, Experimental Heat Transfer, 1st Ed. Beijing: National Defense Industry Press, 120-125, 1998.
• F.W.Dittus, L.M.K.Boelter,Heat Transfer in Automobile Radiators of the Tubular Type, Berkley: University of California Press, 2, 443, 1930.
• F.W.White, Fluid mechanics, 3rd Ed. New York: McGraw-Hill, 2003.
• J.L.Wang, Z.S.Zhang, X.Zeng, “Effect of longitudinal vortices on the turbulent structure in near-wall region,” Acta Mechanica Sinica., 26(5), 1994, 625e629 (in Chinese).