Numerical investigation on double pipe heat exchanger for augmentation of heat transfer having twisted inner pipe with conical ring turbulator

Rinik, Rizvi Arefin

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dc.contributor.author	Rinik, Rizvi Arefin
dc.date.accessioned	2024-01-03T09:04:43Z
dc.date.available	2024-01-03T09:04:43Z
dc.date.issued	2023-04-30
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Jalal, “Experimental investigation of heat transfer enhancement in a double pipe heat exchanger with a twisted inner pipe,” Heat Transfer, vol. 50, no. 8, pp. 8121–8133, Dec. 2021, doi: 10.1002/htj.22269. [36] R. Jamil, “Frictional head loss relation between Hazen-Williams and Darcy Weisbach equations for various water supply pipe materials,” International Journal of Water, vol. 13, no. 4, p. 333, 2019, doi: 10.1504/IJW.2019.106047. [37] L. Yang and K. Du, “A comprehensive review on the natural, forced, and mixed convection of non-Newtonian fluids (nanofluids) inside different cavities,” J Therm Anal Calorim, vol. 140, no. 5, pp. 2033–2054, Jun. 2020, doi: 10.1007/s10973-019- 08987-y. [38] M. R. Salem, M. B. Eltoukhey, R. K. Ali, and K. M. Elshazly, “Experimental investigation on the hydrothermal performance of a double-pipe heat exchanger using helical tape insert,” International Journal of Thermal Sciences, vol. 124, pp. 496–507, Feb. 2018, doi: 10.1016/j.ijthermalsci.2017.10.040. 56 [39] A. T. Wijayanta and M. Aziz, “Heat transfer augmentation of internal flow using twisted tape insert in turbulent flow,” Heat Transfer Engineering, vol. 41, no. 14, pp. 1288–1300, Aug. 2020, doi: 10.1080/01457632.2019.1637149. [40] M. E. Nakhchi, M. Hatami, and M. Rahmati, “Experimental investigation of performance improvement of double-pipe heat exchangers with novel perforated elliptic turbulators,” International Journal of Thermal Sciences, vol. 168, p. 107057, Oct. 2021, doi: 10.1016/j.ijthermalsci.2021.107057. [41] C. Yu, H. Zhang, Y. Wang, M. Zeng, and B. Gao, “Numerical study on turbulent heat transfer performance of twisted oval tube with different cross sectioned wire coil,” Case Studies in Thermal Engineering, vol. 22, p. 100759, Dec. 2020, doi: 10.1016/j.csite.2020.100759	en_US
dc.identifier.uri	http://hdl.handle.net/123456789/2015
dc.description	Supervised by Dr. Md. Rezwanul Karim, Associate Professor, Department of Production and Mechanical Engineering(MPE), Islamic University of Technology (IUT) Board Bazar, Gazipur-1704, Bangladesh	en_US
dc.description.abstract	Double pipe heat exchanger is made of two concentric pipe where one carries hot fluid and another one carries cold fluid inside the pipe. The walls of the pipes allow heat to pass between the fluids. Enhancing the transfer of heat is crucial for effective heat exchangers. This study focuses on evaluating the impact of a fully twisted inner pipe along with conical ring turbulator by conducting a numerical analysis of the double-pipe heat exchanger (DPHE). The analysis considered both parallel and counterflow configurations for fluid-to fluid heat transfer. Additionally a straight elliptical pipe, two other pipes with three twists and full twists along their lengths are investigated to compare heat transfer rate, pressure drop, and turbulence. The realizable k-turbulence model is used, and a grid independency study has conducted using a 3-dimensional structured and unstructured mesh approach. The fully twisted effect generates a swirling motion, and conical rings are inserted inside the outer pipe as a passive turbulator to guide the flow towards the inner pipe, where the hot fluid passes. The regime of turbulent flow is studied within the range of Reynolds numbers from 5000 to 26,000 with water is simulated as the model fluid. Comparing the results, the inner twisted pipe with the conical ring exhibits a significant improvement in the Nusselt number, reaching 445 in the counterflow direction with the six rings. The Performance Evaluation Factor (PEF) is also greater than 1 for both parallel and counterflow flow, indicating that enhancement of the rate of heat transfer, outweighs the decrease in pressure drop. Particularly in counterflow directions the PEF is 2.3 which is impressive. Overall, full twist along the pipe lengths enhances the heat exchanger's performance and full twist with six conical ring fortify most in both flow directions	en_US
dc.language.iso	en	en_US
dc.publisher	Department of Mechanical and Production Engineering(MPE), Islamic University of Technology(IUT), Board Bazar, Gazipur-1704, Bangladesh	en_US
dc.title	Numerical investigation on double pipe heat exchanger for augmentation of heat transfer having twisted inner pipe with conical ring turbulator	en_US
dc.type	Thesis	en_US