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Experimental Study of Heat Transfer Augmentation Characteristics of a Tube Affected by Geometric Parameters of Coiled Spring Inserts | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 11، شماره 1 - شماره پیاپی 21، مرداد 2024، صفحه 127-138 اصل مقاله (514.56 K) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2024.30106.1426 | ||
| نویسندگان | ||
| Arvind Ashok Kapse* ؛ Vinod Chimanrao Shewale | ||
| Department of Mechanical Engineering, M.V.P.S’s K.B.T. College of Engineering, Nashik, 422013, Maharashtra, India | ||
| تاریخ دریافت: 14 اسفند 1401، تاریخ بازنگری: 11 بهمن 1402، تاریخ پذیرش: 13 بهمن 1402 | ||
| چکیده | ||
| In the present study, the heat transfer and flow friction characteristics of a circular tube with coiled spring inserts are experimentally reported for a fully developed turbulent flow regime. Experimental investigations were performed in a circular concentric tube in a tube heat exchanger in the Reynolds number (Re) range of 8000–32,000 with water as a working fluid. The average Nusselt number ratio (Nua/Nup) and average friction factor ratio (fa/fp) with and without inserts are reported to be in the range of 1.79–2.79 and 2.44–4.17, respectively, for the tested six geometries of the inserts. The Nusselt number ratio (Nua/Nuc) based on equal pumping power criteria is also reported and found to be in the range of 0.94–1.24. The effects of varying pitch to length of insert ratio (p/l) and diameter of insert to the inner diameter of tube ratio (dc/Di) on heat transfer and pressure drop are reported, and empirical correlation is given for Nusselt number in terms of Reynolds number (Re), pitch to length of insert ratio (p/l), insert diameter to inner diameter of tube ratio (dc/Di), and Prandtl number (Pr). | ||
| کلیدواژهها | ||
| Passive insert؛ Average performance ratio؛ Turbulent flow | ||
| مراجع | ||
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