Exponentially decaying flow in a gently curved annular pipe

Petrakis, M. A.; Karahalios, G. T.

doi:10.1016/s0020-7462(96)00099-6

Cited by 20 publications

(13 citation statements)

References 8 publications

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“…This problem could be avoided by using a double-pipe configuration. Karahalios [6] and Petrakis and Karahalios [8][9][10] have studied the fluid flow and heat transfer in a curved pipe with a solid core. They showed that the size of the core affected the flow in the annulus, with flows approaching parabolic for large cores and the flow being skewed towards the outer wall [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of a double-pipe helical heat exchanger

Rennie

Raghavan

2005

Experimental Thermal and Fluid Science

124

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Section: Introductionmentioning

confidence: 99%

Experimental studies of a double-pipe helical heat exchanger

Rennie

Raghavan

2005

Experimental Thermal and Fluid Science

124

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“…Petrakis and Karahalios [15,16] obtained the numerical solution of incompressible viscous fluid flow equation for water flowing in a curved double tube with circular cross section. In this investigation, it was indicated that in small core radius, the change of Dean number has a considerable effect on fluid properties whereas it was not observed in the large radius.…”

Section: Introductionmentioning

confidence: 99%

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Andrzejczyk¹,

Muszyński²

2016

Archives of Thermodynamics

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The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow inside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current-and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.

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“…The secondary flows passages originate principally from the interaction between the centrifugal force, the pressure gradient, and the viscous forces. The heat transfer and fluid flow in curved annular ducts with different cross-section have been investigated by researchers [1][2][3][4][5][6][7]. It is known that the Dean number and radius ratio highly affect the friction factor and the Nusselt number in curved circular annular ducts [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of entropy generation in concentric curved annular ducts

Küçük

2010

J Mech Sci Technol

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The entropy generation has been numerically investigated in concentric curved annular square ducts under constant wall temperature boundary condition. The problem has been assumed to be steady, hydrodynamically and thermally fully developed and incompressible laminar flow with constant physical properties. The solutions of discretized equations for continuity, momentum and energy have been obtained by using an elliptic Fortran Program based on the SIMPLE algorithm. Solutions have been achieved for i) Dean numbers ranging from 3.6 to 207.1, ii) Annulus dimension ratios of 5.5, 3.8, 2.9 and 2.36, and iii) Prandtl number of 0.7. In this regard, local entropy generation as well as overall entropy generation in the whole flow field has been analyzed in detail. Moreover, the effects of Dean number and annulus dimension ratio on entropy generation arising from the friction and heat transfer have been investigated. Accordingly, it is concluded that the effect of volumetric entropy generation that is a result of fluid frictional irreversibility can be neglected as compared with volumetric entropy generation due to heat transfer irreversibility. As Dean number increases, the distribution of volumetric entropy generation coming out from the heat transfer irreversibility is formed by the temperature field, which is depending on the curvature.

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Exponentially decaying flow in a gently curved annular pipe

Cited by 20 publications

References 8 publications

Experimental studies of a double-pipe helical heat exchanger

Experimental studies of a double-pipe helical heat exchanger

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Numerical analysis of entropy generation in concentric curved annular ducts

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