OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 7 5 2. Impact of pulsating flow: a) Pulsation, whether applied upstream or downstream, significantly affects turbulence parameters, with the downstream configuration exhibiting a more pronounced effect. b) For 6753 ≤ Re ≤ 31000, downstream pulsation enhanced HT by 20%–22%, while upstream pulsation improved HT by 16%–19%. c) Pulse intensity, governed by f and A, influences the extent of turbulence penetration. No single f and A combination consistently optimizes HT enhancement. Future work will focus on optimization studies to determine optimal parameter combinations. 3. Future directions: a) Future studies should investigate other fluids with varying viscosities and Prandtl numbers, such as water and oil. b) Analyses should be extended to non-circular pipe geometries, such as finned or rectangular channels. c) HT for non-Newtonian fluids under pulsating flow should be analyzed for applications in the food and pharmaceutical industries. d) Future work should combine advanced CFD with experimental validation to achieve reliable predictive modeling and optimization. In conclusion, this study demonstrates that the synergistic combination of surface roughness and pulsating flow effectively enhances HT performance, providing a promising approach for improving industrial heat exchanger applications. References 1. Ye Q., Zhang Y., Wei J. A comprehensive review of pulsating flow on heat transfer enhancement. Applied Thermal Engineering, 2021, vol. 196, p. 117275. DOI: 10.1016/j.applthermaleng.2021.117275. 2. YangB., GaoT., Gong J., Li J. Numerical investigationonflowandheat transfer of pulsatingflowinvarious ribbed channels. Applied Thermal Engineering, 2018, vol. 145, pp. 576–589. DOI: 10.1016/j.applthermaleng.2018.09.041. 3. Duan D., Cheng Y., Ge M., Bi W., Ge P., Yang X. Experimental and numerical study on heat transfer enhancement by flow-induced vibration in pulsating flow. Applied Thermal Engineering, 2022, vol. 207, p. 118171. DOI: 10.1016/j.applthermaleng.2022.118171. 4. Shang F., Fan S., Yang Q., Liu J. An experimental investigation on heat transfer performance of pulsating heat pipe. Journal of Mechanical Science and Technology, 2020, vol. 34, pp. 425–433. DOI: 10.1007/s12206-019-1241-x. 5. Ganapathy V. Steam generators and waste heat boilers: For process and plant engineers. Boca Raton, CRC Press, 2014. 539 p. ISBN 9781138077683. 6. Zohuri B. Application of compact heat exchangers for combined cycle driven efficiency in next generation nuclear power plants: A novel approach. Cham, Springer Nature Link, 2015. 366 p. eISBN 978-3-319-23537-0. DOI: 10.1007/978-3-319-23537-0. 7. Bassols J., Kuckelkorn B., Langreck J., Schneider R., Veelken H. Trigeneration in the food industry. Applied Thermal Engineering, 2002, vol. 22 (6), pp. 595–602. DOI: 10.1016/S1359-4311(01)00111-9. 8. Šalić A., Tušek A., Zelić B. Application of microreactors in medicine and biomedicine. Journal of Applied Biomedicine, 2012, vol. 10 (3), pp. 137–153. DOI: 10.2478/v10136-012-0011-1. 9. Sharma A., Tyagi V.V., Chen C.R., Buddhi D. Review on thermal energy storage with phase change materials and applications. Renewable and Sustainable Energy Reviews, 2009, vol. 13 (2), pp. 318–345. DOI: 10.1016/j. rser.2007.10.005. 10. Ameen A. Refrigeration and air conditioning. PHI Learning Pvt. Ltd., 2006. 512 p. ISBN 8120326717. ISBN 978-8120326712. 11. Oliet C., Oliva A., Castro J., Pérez-Segarra C.D. Parametric studies on automotive radiators. Applied Thermal Engineering, 2007, vol. 27 (11), pp. 2033–2043. DOI: 10.1016/j.applthermaleng.2006.12.006. 12. Heldman D., Moraru C.E., eds. Encyclopedia of agricultural, food, and biological engineering. 2nd ed. Boca Raton, CRC Press, 2010. DOI: 10.1201/9780429257599. 13. Coker A.K. Introduction. Coker A.K. Petroleum refining design and application handbook. John Wiley & Sons, 2018, ch. 1, pp. 1–6. ISBN 978-1-119-25710-3. DOI: 10.1002/9781119257110.ch1. 14. Coker A.K. Thermodynamic properties of petroleum and petroleum fractions. Coker A.K. Petroleum refining design and application handbook. John Wiley & Sons, 2018, ch. 4, pp. 63–110. DOI: 10.1002/9781119257110.ch4.
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