پیوندهای مفید
آمار
| تعداد نشریات | 21 |
| تعداد شمارهها | 680 |
| تعداد مقالات | 9,915 |
| تعداد مشاهده مقاله | 70,116,176 |
| تعداد دریافت فایل اصل مقاله | 49,476,663 |
The effect of Geometrical parameters on heat transfer coefficient in helical double tube exchangers | ||
| Journal of Heat and Mass Transfer Research | ||
| مقاله 3، دوره 1، شماره 2، بهمن 2014، صفحه 75-82 اصل مقاله (2.79 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2014.182 | ||
| نویسندگان | ||
| Seyed Faramarz Ranjbar؛ Mir Hatef Seyyedvalilu* | ||
| Mechanical Engineering Faculty, University of Tabriz, Tabriz, Iran | ||
| تاریخ دریافت: 09 آبان 1392، تاریخ بازنگری: 27 بهمن 1392، تاریخ پذیرش: 29 بهمن 1392 | ||
| چکیده | ||
| Helical coil heat exchangers are widely used in industrial applications ranging from cryogenic processes, air-conditioning, and nuclear reactors to waste heat recovery due to their compact size and high heat transfer coefficient. In this kind of heat exchangers, flow and heat transfer are complicated. This paper reports a numerical investigation of the influence of different parameters such as coil radius, coil pitch and diameter of tube on the characteristics of heat transfer in helical double tube heat exchangers using the well-known Fluent CFD software. Modeling of the study was implemented based on principles of heat transfer, fluid mechanics, and thermodynamics. By imposing boundary conditions and selecting of an appropriate grid, whereby the results are independent of meshing, the obtained results were compared and validated with existing experimental results in the open literature. The results indicate that heat transfer augments by increasing of the inner Dean number, inner tube diameter, curvature ratio, and by the reduction of the pitch of the heat exchanger coil. | ||
| کلیدواژهها | ||
| Helical double tube؛ Heat exchanger؛ Curvature ratio؛ Dean number؛ Overall heat transfer coefficient | ||
| مراجع | ||
|
[1]. Rennie T.J, Raghavan G.S.V. Laminar parallel flow in a tube-in-tube helical heat exchange; AIC2002 Meeting CSAE/SCGR Program, Saskatchwan.14-17; 2002.
[2]. Yadav Y.P. and Tiwari G.N. Transient analysis of double-pipe heat exchanger coupled to flat-plate solar collector; Energy conversion and management volume 27, 15-19, 1987.
[3]. Rennie T.J, Raghavan G.S.V. Experimental studies of a double pipe helical heat exchanger; Experimental Thermal and Fluid Science, 919-924, 2005.
[4]. Rennie T.J, Raghavan G.S.V. Effect of fluid thermal properties on the heat transfer characteristics in a double-pipe helical heat exchanger; I.J. of Thermal Sciences, volume 45, 1158-1165, 2006.
[5]. Han J. T, Lin C. X, Ebadian M. A. Condensation heat transfer and pressure drop characteristics of R-134a in an annular helical pipe; International communications in heat and mass transfer, volume 32, 1307-1316, 2005.
[6]. Kumar V, Saini S, Sharma M, Nigam K. D. P. Pressure drop and heat transfer study in tube-in-tube helical heat exchanger; Chemical Engineering Science, volume61, 4403-4416, 2006.
[7]. Lin C. X, Ebadian M. A. Condensation heat transfer and pressure drop of R-134a in annular helicoidal pipe at different orientations; International Journal of Heat and Mass Transfer, Volume50, 4256-4264, 2007.
[8]. Kumar V, Faizee B, Mridha M, Nigam K. D. P. Numerical studies of a tube-in-tube helically coiled heat exchanger; Chemical Engineering and Processing, volume 47,2287-2295, 2008.
[9]. Garrido D. C, Castelazo E. S, Hernandez J.A, Valladares O. G. Siqueiros J. Romero D.J. Heat transfer of a helical double-pipe a vertical evaporator; Theoretical Analysis &Experimental validation, App. Energy, 2008.
[10]. Xiaowen Yi, Lee W.L. The use of helical heat exchanger for heat recovery domestic water-cooled air-conditioner; Energy conversion and management, volume50, 240-246, 2009.
[11]. Xin RC, Awwad A, Dong Z.F, Ebadian M. A. An Experimental study of single-phase and two-phase flow pressure drops in annular helicoidal pipes; International Journal of Heat and Fluid Flow, Volume18, 482-488, 1997.
[12]. Petrakis M. A., Karahalios G. T. Exponentially decaying flow in a gently curved annular pipe; International Journal of None-linear Mechanics, 823-835, 1997.
[13]. Petrakis M. A., Karahalios G. T. Fluid flow behavior in a curved annular conduit; International Journal of None-linear Mechanics, Volume 34, 13-25, 1999.
[14]. Han J. T, Lin C.X, Ebadian M. A. Condensation heat transfer and pressure drop characteristics of R-134a in an annular helical pipe; International Communications in Heat & Mass Transfer, volume 32, 1307-1316, 2005.
[15]. Reza Beigzadeh, Masoud Rahimi. Prediction of heat transfer and flow characteristics in helically coiled tubes using artificial neural networks; International Communications in Heat and Mass Transfer, volume 32, 1279–1285, 2012.
[16]. Massimiliano Di Liberto, Michele Ciofalo. A study of turbulent heat transfer in curved pipes by numerical simulation; International Journal of Heat and Mass Transfer, 112–125, 2013.
[17]. Gabriela Huminic, Angel Huminic. Heat transfer characteristics in double tube helical heat exchangers using nanofluids; International Journal of Heat and Mass Transfer, 4280–4287, 2011.
[18]. P.S. Srinivasan. Pressure drop and heat transfer in coils; Chemical Engineering, 113-119, 1968.
[19]. B. Xavier, T. Xavier, P. philippe, B. Philippe. Comparison of tetrahedral and hexahedral meshe for organ finite element modeling: an application to kidney impact.
[20]. Jayakumar J. S, Mahajani S. M, Mandal J. C, Vijayan P. K, Bhoi R. Experimental and CFD estimation of heat transfer in helically coiled heat exchangers. Chemical Engineering Research and Design; 86:221-232, 2008. | ||
|
آمار تعداد مشاهده مقاله: 9,106 تعداد دریافت فایل اصل مقاله: 5,842 |
||