Investigation on the Effect of Length and Amplitude of Sinusoidal Wavy Vortex Generators on the Heat Transfer Rate, Pressure Drop, and London Factor in Compact Heat Exchangers
the effect of length and amplitude of sinusoidal wavy vortex generators in compact heat exchangers
Compact heat exchangers (CHE) improve the heat transfer rate with lighter weight and lower volume than other counterparts. An important point in CHEs is their higher pressure drop relative to conventional heat exchangers. This study aims to investigate the heat transfer rate and pressure drop in some proposed models of these heat exchangers with/without vortex generators (VGs) in different cases. A hot fluid of temperature 350°C flowing through tubes and a cold fluid of temperature 300°C circulating inside the shell are assumed. To this end, several VGs with sinusoidal wavy shapes are designed and examined with different amplitudes of the sine wave and different lengths to determine the effects of these parameters on the heat transfer rate of tubes and pressure drop along the heat exchanger length. In the 2D steady-state laminar fluid flow, governing equations are discretized using the finite element method and analyzed for Reynolds numbers 400 to 1000 in the ANSYS software. Finally, with a 5.06% increase in the Nusselt number, the sinusoidal VGs of amplitude 1 and length 6 mm quantitatively indicated the best performance in terms of the heat transfer rate and pressure drop (London factor) among the studied cases.
Keywords:Pressure drop, Shell-and-tube heat exchanger, Sinusoidal wavy VG, London factor
 Gao, S.D., Wang, L.B., Zhang, Y.H., et al., 2003. The optimum height of winglet vortex generators mounted on three-row flat tube bank fin.Journal of Heat Transfer. 125(6), 1007-1016.
 Žkauskas, A., 1972. Heat transfer from tubes in crossflow. Advances in Heat Transfer. 8, 93-160.
 Leu, J.S., Wu, Y.H., Jang, J.Y., 2004. Heat transfer and fluid flow analysis in plate-fin and tube heat exchangers with a pair of block shape vortex generators. International Journal of Heat and Mass Transfer. 47(19), 4327-4338.
 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, 132-140.
 He, Y.L., Chu, P., Tao, W.Q., et al., 2013. Analysis of heat transfer and pressure drop for finand-tube heat exchangers with rectangular winglet-type vortex generators. Applied Thermal Engineering. 61(2), 770-783.
 Modi, A.J., Rathod, M.K., 2019. 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, 310-326.
 Awais, M., Bhuiyan, A.A., 2019. Enhancement of thermal and hydraulic performance of compact finned-tube heat exchanger using vortex generators (VGs): A parametric study. International Journal of Thermal Sciences. 140, 154-166.
 Lu, G., Zhai, X., 2019. Effects of curved vortex generators on the air-side performance of finand-tube heat exchangers. International Journal of Thermal Sciences. 136, 509-518.
 Wang, Y., Zhao, W., Wang, P., et al., 2021. Thermal performance of elliptical fin-and-tube heat exchangers with vortex generator under various inclination angles. Journal of Thermal Science. 30, 257-270.
 Sahel, D., Ameur, H., Alem, K., 2021. Enhancement of the hydrothermal characteristics of finand-tube heat exchangers by vortex generators. Journal of Thermophysics and Heat Transfer. 35(1), 152-163.
 Caliskan, S., Şevik, S., Özdilli, Ö., 2022. Heat transfer enhancement by a sinusoidal wavy plate having punched triangular vortex generators. International Journal of Thermal Sciences. 181, 107769.
 Naik, H., Tiwari, S., Kim, H.D., 2022. Flow and thermal characteristics produced by a curved rectangular winglet vortex generator in a channel. International Communications in Heat and Mass Transfer. 135, 106103.
 Hu, D., Zhang, Q., Song, K., et al., 2023. Performance optimization of a wavy finned-tube heat exchanger with staggered curved vortex generators. International Journal of Thermal Sciences. 183, 107830.
 Song, K., Hu, D., Zhang, Q., et al., 2022. Thermal-hydraulic characteristic of a novel wavy fin-and-circle tube heat exchanger with concave curved vortex generators. International Journal of Heat and Mass Transfer. 194, 123023.
 Luo, W., Yang, Z., Jiao, K., et al., 2022. Novel structural designs of fin-tube heat exchanger for PEMFC systems based on wavy-louvered fin and vortex generator by a 3D model in OpenFOAM. International Journal of Hydrogen Energy. 47(3), 1820-1832.
 Shlash, B.A.A., Koç, I., 2022. Turbulent fluid flow and heat transfer enhancement using novel Vortex Generator. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 96(1), 36-52.
 Tepe, A.Ü., Yilmaz, H., 2022. Thermal-hydraulic performance of the circular-slice-shaped-winglet for tube bank heat exchanger. International Journal of Thermal Sciences. 179, 107711.
 Göksu, T.T., Behçet, R., 2022. Experimental investigation of the effect of a novel curved winglet vortex generator on heat transfer with a designed controller circuit. International Journal of Thermal Sciences. 180, 107724.
 Zhong, X., Fu, S., Chan, K., et al., 2022. Experimental and numerical study of heat transfer performance of a channel flow with an inverted flag. International Journal of Heat and Mass Transfer. 193, 122969.
 Akcay, S., 2022. Numerical analysis of heat transfer improvement for pulsating flow in a periodic corrugated channel with discrete V-type winglets. International Communications in Heat and Mass Transfer. 134, 105991.
 Wang, Y., Liu, P., Xiao, H., et al., 2022. Design and optimization on symmetrical wing longitudinal swirl generators in circular tube for laminar flow. International Journal of Heat and Mass Transfer. 193, 122961.
 Berber, A., Gürdal, M., Yetimoğlu, M., 2022. Experimental study on the heat transfer enhancement in a rectangular channel with curved winglets. Experimental Heat Transfer. 35(6), 797-817.
 Suman, S., Uppada, V., Singh, S., et al., 2022. Numerical investigation and experimental validation of shape and position optimisation of a static wavy flag for heat transfer enhancement. International Journal of Ambient Energy. 43(1), 3237-3245.
 He, J., Deng, Q., Xiao, K., et al., 2022. Impingement heat transfer enhancement in crossflow by v-shaped protrusion vortex generator. Heat Transfer Engineering. (IF 2.431), 1-26.DOI: https://doi.org/10.1080/01457632.2022.2134080
 Sheikholeslami, M., Nimafar, M., Ganji, D.D., 2017. Analytical approach for the effect of melting heat transfer on nanofluid heat transfer. The European Physical Journal Plus. 132, 385.
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Copyright © 2023 Davood Barati; Mohammad Nimafar; Gholamreza Salehi
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