THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

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Mete Özşen

,

Sebiha Yildiz

online first only

Numerical performance analysis of delta vortex generator located upstream of in-line tube bundle

ABSTRACT
The effect of the delta vortex generator located upstream of the in-line tube bundle on the heat transfer and pressure loss for cross-flow air was numerically investigated. The best accurate results were obtained by using the "Realizable k-epsilon" model with the "standard" wall function. In order to increase the accuracy of the numerical model, "production limit" and "curvature correction" coefficients that depend on the inlet air velocity were used. The average error in heat transfer and pressure loss in the range of Re=3000 and 13000 was obtained as 4.4% and 9.4%, respectively. The distance between the tube bundle and vortex generator, angle of attack, and pitch were analyzed parametrically. In all vortex generator designs, upward secondary flows in front of tubes were observed between the rows. A maximum 16.6% improvement in the average Nusselt number and a maximum 42% penalty in pressure loss were obtained. The angle of attack is the parameter that affects the heat transfer the most. When the changes in both heat transfer and pressure loss are taken into account, for Re>9500, performance is positively affected with almost every vortex generator design.
KEYWORDS
Delta Winglet, vortex generator, In-line tube bundle, numerical analysis, Heat Transfer Enhancement
PAPER SUBMITTED: 2023-10-10
PAPER REVISED: 2023-12-12
PAPER ACCEPTED: 2023-12-18
PUBLISHED ONLINE: 2024-01-20
DOI REFERENCE: https://doi.org/10.2298/TSCI231010287O
REFERENCES
  1. Jacobi, A. M., Shah, R. K., Heat Transfer Surface Enhancement Through The Use Of Longitudinal Vortices: A Review Of Recent Progress, Experimental Thermal and Fluid Science, 11 (1995), 3, pp. 295-309
  2. Kataoka, K., et al., Heat/Mass Transfer In Taylor Vortex Flow With Constant Axial Flow Rates, International Journal of Heat and Mass Transfer, 20 (1977), 1, pp. 57-63
  3. Sadeghianjahromi, A., Wang, C.-C., Heat Transfer Enhancement In Fin-And-Tube Heat Exchangers - A Review On Different Mechanisms, Renewable and Sustainable Energy Reviews, 137 (2021), pp. 110470 doi.org/10.1016/j.rser.2020.110470
  4. Zdanski, P. S. B., et al., Effects Of Delta Winglet Vortex Generators On Flow Of Air Over In-Line Tube Bank: A New Empirical Correlation For Heat Transfer Prediction, International Communications in Heat and Mass Transfer, 67 (2015), pp. 89-96 dx.doi.org/10.1016/j.icheatmasstransfer.2015.07.010
  5. Kwak, K. M., et al., Heat Transfer And Pressure Loss Penalty For The Number Of Tube Rows Of Staggered Finned-Tube Bundles With A Single Transverse Row Of Winglets, International Journal of Heat and Mass Transfer, 46 (2003), 1, pp. 175-180
  6. Torii, K., et al., 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 (2002), 18, pp. 3795-3801
  7. Pal, A., et al., Enhancement Of Heat Transfer Using Delta-Winglet Type Vortex Generators With A Common-Flow-Up Arrangement, Numerical Heat Transfer, Part A: Applications: An International Journal of Computation and Methodology, 61 (2012), 12, pp. 912-928
  8. Arora, A., et al., Numerical Optimization Of Location Of ‘Common Flow Up' Delta Winglets For Inline Aligned Finned Tube Heat Exchanger, Applied Thermal Engineering, 82 (2015), pp. 329-340 dx.doi.org/10.1016/j.applthermaleng.2015.02.071
  9. Agarwal, S., Sharma, R. P., Numerical Investigation of Heat Transfer Enhancement Using Hybrid Vortex Generator Arrays in Fin-and-Tube Heat Exchangers, Journal of Thermal Science and Engineering Applications, 8 (2016), 3, pp. 031007 1-9
  10. Valencia, A., et al. Heat Transfer And Flow Loss In A Fin-Tube Heat Exchanger Element With Wing-Type Vortex Generators, Institution of Chemical Engineers Symposium Series, 1 (1992), pp. 327-333
  11. Lemouedda, A., et al., 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 (2010), 23-24, pp. 5386-5399
  12. Salviano, L. O., et al., Optimization Of Winglet-Type Vortex Generator Positions And Angles In Plate-Fin Compact Heat Exchanger: Response Surface Methodology And Direct Optimization, International Journal of Heat and Mass Transfer, 82 (2015), pp. 373-387 dx.doi.org/10.1016/j.ijheatmasstransfer.2014.10.072
  13. Jang, J.-Y., et al., 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 (2013), pp. 432-444 dx.doi.org/10.1016/j.ijheatmasstransfer.2013.08.028
  14. Mangrulkar, C. K., et al., Experimental And CFD Prediction Of Heat Transfer And Friction Factor Characteristics In Cross Flow Tube Bank With Integral Splitter Plate, International Journal of Heat and Mass Transfer, 104 (2017), pp. 964-978 dx.doi.org/10.1016/j.ijheatmasstransfer.2016.09.013
  15. Abraham, J. D., et al., Numerical Analysis For Thermo-Hydraulic Performance Of Staggered Cross Flow Tube Bank With Longitudinal Tapered Fins, International Communications in Heat and Mass Transfer, 118 (2020), pp. 104905 doi.org/10.1016/j.icheatmasstransfer.2020.104905
  16. Jayavel, S., Tiwari, S., Effect of Vortex Generators and Integral Splitter Plate on Heat Transfer and Pressure Drop for Laminar Flow Past Channel-Confined Tube Banks, Heat Transfer Engineering, 31 (2010), 5, pp. 383-394
  17. Sarangi, S. K., et al., Analysis And Optimization Of The Curved Trapezoidal Winglet Geometry In A Compact Heat Exchanger, Applied Thermal Engineering, 182 (2021), pp. 116088 doi.org/10.1016/j.applthermaleng.2020.116088
  18. Gong, B., et al., Heat Transfer Characteristics Of A Circular Tube Bank Fin Heat Exchanger With Fins Punched Curve Rectangular Vortex Generators In The Wake Regions Of The Tubes, Applied Thermal Engineering, 75 (2015), pp. 224-238 dx.doi.org/10.1016/j.applthermaleng.2014.09.043
  19. Lin, Z., et al., Heat Transfer Augmentation Characteristics Of A Fin Punched With Curve Trapezoidal Vortex Generators At The Rear Of Tubes, Thermal Science, 26 (2022), 4B, pp. 3529-3544
  20. Lin, Z., et al., Parametric Effect Of The Interrupted Annular Groove Fin On Flow And Heat Transfer Characteristics Of A Finned Circular Tube Heat Exchanger, Thermal Science, 26 (2022), 6A, pp. 4503-4517
  21. Salviano, L. O., et al., Thermal-Hydraulic Performance Optimization Of Inline And Staggered Fin-Tube Compact Heat Exchangers Applying Longitudinal Vortex Generators, Applied Thermal Engineering, 95 (2016), pp. 311-329 dx.doi.org/10.1016/j.applthermaleng.2015.11.069
  22. Arora, A., et al., Development Of Parametric Space For The Vortex Generator Location For Improving Thermal Compactness Of An Existing Inline Fin And Tube Heat Exchanger, Applied Thermal Engineering, 98 (2016), pp. 727-742 dx.doi.org/10.1016/j.applthermaleng.2015.12.117
  23. Wang, Y., Numerical Study Of Hydrodynamics And Thermal Characteristics Of Heat Exchangers With Delta Winglets, Thermal Science, 24 (2020), 1A, pp. 325-338
  24. Naik, H., Tiwari, S., Thermodynamic Performance Analysis Of An Inline Fin-Tube Heat Exchanger In Presence Of Rectangular Winglet Pairs, International Journal of Mechanical Sciences, 193 (2021), pp. 106148 doi.org/10.1016/j.ijmecsci.2020.106148
  25. ***, ANSYS, Fluent User's Guide, ANSYS, Inc., 2023
  26. Pauli, D., Estudo Experimental Da Troca De Calor Convectiva Em Matrizes Tubulares: Efeitos De Promotores De Turbulência Do Tipo Asa Delta (Experimental Study Of Convective Heat Exchange In Tubular Matrixes: Effects Of Turbulence Promoters Of Delta Type), B. Sc. Thesis, State University of Santa Catarina, Joinville, Brazil, 2014.
  27. Grimison, E. D., Correlation And Utilization Of New Data On Flow Resistance And Heat Transfer For Cross Flow Of Gases Over Tube Banks, ASME. Trans., 59 (1937), 7, pp. 583-594
  28. Zhukauskas, A., Heat Transfer From Tubes in Cross Flow, Advance in Heat Transfer, 8 (1972), pp. 93-160 doi.org/10.1016/S0065-2717(08)70038-8
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Numerical performance analysis of delta vortex generator located upstream of in-line tube bundle