Analysis on enhanced turbulent heat transfer and flow characteristic in a twisted and dimpled oval tube

Abstract

This work reveals the heat transfer and flow characteristic in a twisted and oval tube under turbulent flow and constant heat flux conditions. Numerical analyses were carried out on several twisted and oval tube configurations. In order to clearly reveal the effect of dimples in the swirl flow, the twisted oval tubes with and without dimples are considered. In order to enhance the convective heat transfer, the dimples were placed in the narrowing region of the twisted tube where the heat transfer was inefficient. The results indicate that the dimples on the twisted tube significantly increase the heat transfer, although they cause to slightly increase pressure drop penalty. While the decrease in the pitch length induced to enhance the heat transfer, it significantly and negatively affected the hydraulic performance of the tube. Furthermore, while the dimples on the twisted oval tube induce the average Nusselt number to increase by 14.8%, they cause to the friction factor increase by 18.0%. The best configuration that is the case of dimpled twisted oval tube having pitch length of 200 mm at Reynolds number of 10,000, yields thermo-hydraulic performance criteria of 1.428.

Keywords

• heat transfer enhancement
• thermo-hydraulic performance
• twisted oval tube
• dimpled tube.

References

1. [1] Zimparov, V.D., Angelov, M.S., Petkov, V.M., (2022). Maximum benefits from the use of enhanced heat transfer surfaces. International Communications in Heat and Mass Transfer. 134: 105992. doi: 10.1016/j.icheatmasstransfer.2022.105992.
2. [2] Uyanik, M., Dagdevir, T., Ozceyhan, V., (2022). Thermo-hydraulic performance investigation of a heat exchanger tube inserted with twisted tapes modified with various twist ratio and alternate axis. European Mechanical Science. 6(3): 189–95. doi: 10.26701/ems.1032081.
3. [3] Sheikholeslami, M., Gorji-Bandpy, M., Ganji, D.D., (2015). Review of heat transfer enhancement methods: Focus on passive methods using swirl flow devices. Renewable and Sustainable Energy Reviews. 49: 444–69. doi: 10.1016/j.rser.2015.04.113.
4. [4] Liu, S., Sakr, M., (2013). A comprehensive review on passive heat transfer enhancements in pipe exchangers. Renewable and Sustainable Energy Reviews. 19: 64–81. doi: 10.1016/J.RSER.2012.11.021.
5. [5] Dagdevir, T., Ozceyhan, V., (2021). Investigation of the Effect of Using Water Based Hybrid Nanofluid on Thermal and Hydraulic Performance in a Heat Exchanger. Erciyes University Journal of Institue Of Science and Technology. 37(7): 61–73.
6. [6] Song, Y.-Q., Izadpanahi, N., Fazilati, M.A., Lv, Y.-P., Toghraie, D., (2021). Numerical analysis of flow and heat transfer in an elliptical duct fitted with two rotating twisted tapes. International Communications in Heat and Mass Transfer. 125: 105328. doi: 10.1016/j.icheatmasstransfer.2021.105328.
7. [7] Dagdevir, T., Keklikcioglu, O., Ozceyhan, V., (2019). Heat transfer performance and flow characteristic in enhanced tube with the trapezoidal dimples. International Communications in Heat and Mass Transfer. 108: 104299. doi: 10.1016/j.icheatmasstransfer.2019.104299.
8. [8] Hassan, M.A., Al-Tohamy, A.H., Kaood, A., (2022). Hydrothermal characteristics of turbulent flow in a tube with solid and perforated conical rings. International Communications in Heat and Mass Transfer. 134: 106000. doi: 10.1016/j.icheatmasstransfer.2022.106000.

9. [9] Dagdevir, T., Ozceyhan, V., (2022). A comprehensive second law analysis for a heat exchanger tube equipped with the rod inserted straight and twisted tape and using water/CuO nanofluid. International Journal of Thermal Sciences. 181: 107765. doi: 10.1016/j.ijthermalsci.2022.107765.
10. [10] Tan, X., Zhu, D., Zhou, G., Zeng, L., (2013). Heat transfer and pressure drop performance of twisted oval tube heat exchanger. Applied Thermal Engineering. 50(1): 374–83. doi: 10.1016/j.applthermaleng.2012.06.037.
11. [11] Bishara, F., Jog, M.A., Manglik, R.M., (2009). Computational Simulation of Swirl Enhanced Flow and Heat Transfer in a Twisted Oval Tube. Journal of Heat Transfer. 131(8). doi: 10.1115/1.3143015.
12. [12] Tan, X., Zhu, D., Zhou, G., Zeng, L., (2012). Experimental and numerical study of convective heat transfer and fluid flow in twisted oval tubes. International Journal of Heat and Mass Transfer. 55(17–18): 4701–10. doi: 10.1016/j.ijheatmasstransfer.2012.04.030.
13. [13] Yang, S., Zhang, L., Xu, H., (2011). Experimental study on convective heat transfer and flow resistance characteristics of water flow in twisted elliptical tubes. Applied Thermal Engineering. 31(14–15): 2981–91. doi: 10.1016/j.applthermaleng.2011.05.030.
14. [14] Talebi, M., Lalgani, F., (2021). Assessment of thermal behavior of variable step twist in the elliptical spiral tube heat exchanger. International Journal of Thermal Sciences. 170: 107126. doi: 10.1016/j.ijthermalsci.2021.107126.
15. [15] Wu, C.-C., Chen, C.-K., Yang, Y.-T., Huang, K.-H., (2018). Numerical simulation of turbulent flow forced convection in a twisted elliptical tube. International Journal of Thermal Sciences. 132: 199–208. doi: 10.1016/j.ijthermalsci.2018.05.028.
16. [16] Pour Razzaghi, M.J., Ghassabian, M., Daemiashkezari, M., Abdulfattah, A.N., Hassanzadeh Afrouzi, H., Ahmad, H., (2022). Thermo-hydraulic performance evaluation of turbulent flow and heat transfer in a twisted flat tube: A CFD approach. Case Studies in Thermal Engineering. 35: 102107. doi: 10.1016/j.csite.2022.102107.
17. [17] Li, X., Liu, S., Tang, S., Mo, X., Wang, L., Zhu, D., (2022). Analysis of heat transfer characteristics and entransy evaluation of high viscosity fluid in a novel twisted tube. Applied Thermal Engineering. 210: 118388. doi: 10.1016/j.applthermaleng.2022.118388.
18. [18] Tang, X., Dai, X., Zhu, D., (2015). Experimental and numerical investigation of convective heat transfer and fluid flow in twisted spiral tube. International Journal of Heat and Mass Transfer. 90: 523–41. doi: 10.1016/j.ijheatmasstransfer.2015.06.068.
19. [19] Cheng, J., Qian, Z., Wang, Q., Fei, C., Huang, W., (2019). Numerical study of heat transfer and flow characteristic of twisted tube with different cross section shapes. Heat and Mass Transfer. 55(3): 823–44. doi: 10.1007/s00231-018-2471-7.
20. [20] Farnam, M., Khoshvaght-Aliabadi, M., Asadollahzadeh, M.J., (2018). Heat transfer intensification of agitated U-tube heat exchanger using twisted-tube and twisted-tape as passive techniques. Chemical Engineering and Processing - Process Intensification. 133: 137–47. doi: 10.1016/j.cep.2018.10.002.
21. [21] Yu, C., Zhang, H., Wang, Y., Zeng, M., Gao, B., (2020). Numerical study on turbulent heat transfer performance of twisted oval tube with different cross sectioned wire coil. Case Studies in Thermal Engineering. 22: 100759. doi: 10.1016/j.csite.2020.100759.
22. [22] Mashayekhi, R., Eisapour, A.H., Eisapour, M., Talebizadehsardari, P., Rahbari, A., (2022). Hydrothermal performance of twisted elliptical tube equipped with twisted tape insert. International Journal of Thermal Sciences. 172: 107233. doi: 10.1016/j.ijthermalsci.2021.107233.
23. [23] Samruaisin, P., Kunlabud, S., Kunnarak, K., Chuwattanakul, V., Eiamsa-ard, S., (2019). Intensification of convective heat transfer and heat exchanger performance by the combined influence of a twisted tube and twisted tape. Case Studies in Thermal Engineering. 14: 100489. doi: 10.1016/j.csite.2019.100489.
24. [24] Eiamsa-ard, S., Promthaisong, P., Thianpong, C., Pimsarn, M., Chuwattanakul, V., (2016). Influence of three-start spirally twisted tube combined with triple-channel twisted tape insert on heat transfer enhancement. Chemical Engineering and Processing: Process Intensification. 102: 117–29. doi: 10.1016/j.cep.2016.01.012.
25. [25] Li, M., Khan, T.S., Al-Hajri, E., Ayub, Z.H., (2016). Single phase heat transfer and pressure drop analysis of a dimpled enhanced tube. Applied Thermal Engineering. 101: 38–46. doi: 10.1016/J.APPLTHERMALENG.2016.03.042.
26. [26] Dagdevir, T., (2022). Multi-objective optimization of geometrical parameters of dimples on a dimpled heat exchanger tube by Taguchi based Grey relation analysis and response surface method. International Journal of Thermal Sciences. 173: 107365. doi: 10.1016/j.ijthermalsci.2021.107365.
27. [27] Sabir, R., Khan, M.M., Sheikh, N.A., Ahad, I.U., Brabazon, D., (2020). Assessment of thermo-hydraulic performance of inward dimpled tubes with variation in angular orientations. Applied Thermal Engineering. 170: 115040. doi: 10.1016/j.applthermaleng.2020.115040.
28. [28] Xie, S., Liang, Z., Zhang, L., Wang, Y., (2018). A numerical study on heat transfer enhancement and flow structure in enhanced tube with cross ellipsoidal dimples. International Journal of Heat and Mass Transfer. 125: 434–44. doi: 10.1016/j.ijheatmasstransfer.2018.04.106.
29. [29] Zhang, L., Xiong, W., Zheng, J., Liang, Z., Xie, S., (2021). Numerical analysis of heat transfer enhancement and flow characteristics inside cross-combined ellipsoidal dimple tubes. Case Studies in Thermal Engineering. 25: 100937. doi: 10.1016/j.csite.2021.100937.
30. [30] Incropera, F. P., DeWitt, D. P., Bergman, T. L., & Lavine, A.S., (1996). Fundamentals of heat and mass transfer. 6th ed., New York: Wiley.
31. [31] Cengel, Y.A., John, C.M., (2012). Fuid Mechanics: Fundamentals and Applications. MCGraw-Hill Education.
32. [32] Fluent., (2016). ANSYS Fluent User Guide.
33. [33] Webb, R.L., (1981). Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design. International Journal of Heat and Mass Transfer. 24(4): 715–26. doi: 10.1016/0017-9310(81)90015-6.
34. [34] Gnielinski V., (1976). New equations for heat and mass transfer in turbulent pipe and channel flow. International Chemical Engineering. 27: 359–68.
35. [35] Petukhov, B.S., Irvine, T.F., Hartnett, J.P., (1970). Advances in heat transfer. Academic, New York. 6: 503–64.