Numerical study on heat transfer characteristics of double tube heat exchangers with alternating horizontal or vertical oval cross section pipes as inner tubes

Chen, Wen-Lih; Dung, Wei-Chen

doi:10.1016/j.enconman.2007.12.007

Cited by 42 publications

(10 citation statements)

References 16 publications

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“…Two examples are the swirled tube [20] and the alternating elliptical axis tube which was experimentally studied by Meng et al [21] and numerically studied by Chen et al [22]. This last kind of tube was also applied to a coaxial tube configuration by Chen and Dung [23]. A similar tube was also experimentally studied by Sajadi et al [24] who highlighted the heat transfer enhancement achieved.…”

Section: Introductionmentioning

confidence: 92%

The effect of successive alternating wall deformation on the performance of an annular heat exchanger

Zambaux

Harion

Russeil

et al. 2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 92%

The effect of successive alternating wall deformation on the performance of an annular heat exchanger

Zambaux

Harion

Russeil

et al. 2015

Applied Thermal Engineering

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“…Chen and Dung [18] carried out a numerical study on heat transfer characteristics in a parallel flow arrangement and counter flow in double-tube heat exchangers with AEA tubes as the inner tubes. Their numerical results showed that the inner AEA tube produced multi-longitudinal vortices in both the inner and outer tube flows and that heat transfer improved.…”

Section: Introductionmentioning

confidence: 99%

Investigation of heat transfer and pressure drop of turbulent flow in tubes with successive alternating wall deformation under constant wall temperature boundary conditions

Khaboshan

2018

J Braz. Soc. Mech. Sci. Eng.

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In this study, the effects of the presence of multi-longitudinal vortex and various rotation angles between the pitches of alternating elliptical axis (AEA) tubes on heat transfer and pressure drop of turbulent flow were numerically investigated. Turbulent flow of water fluid was simulated at Reynolds numbers of 10,000-60,000. The turbulent flow and heat transfer in the tubes were discussed in terms of parameters such as static pressure, velocity magnitude, wall shear stress, turbulent intensity, performance evaluation criterion and the field synergy principle. The results demonstrate that most heat transfer occurs in the transition zone, but this also caused a high rate of pressure drop. Increasing the rotation angle between pitches from 60°to 80°increased the heat transfer, which increased the number of the multi-longitudinal vortices from four to eight and better mixed the cold fluid with the hot fluid near the tube wall on more paths. The friction factor decreased and the average Nusselt number increased as the Reynolds number increased. Both parameters increased as the angle of the pitch rotation increased. The performance evaluation criteria for all AEA tubes at a constant pumping power showed that the highest value (1.09) was achieved at a low Reynolds number (Re = 10,000) in the AEA 90°tube.

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“…Because of its high capacity to model and simulate different processes, many numerical studies have been performed on shell and tube heat exchanger design using CFD methods [1,6,[9][10][11]15,16].…”

Section: Introductionmentioning

confidence: 99%

Twisted bundle heat exchangers performance evaluation by CFD (CJ12/5054)

Jahanmir¹,

Farhadi²

2012

International Communications in Heat and Mass Transfer

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Numerical study on heat transfer characteristics of double tube heat exchangers with alternating horizontal or vertical oval cross section pipes as inner tubes

Cited by 42 publications

References 16 publications

The effect of successive alternating wall deformation on the performance of an annular heat exchanger

The effect of successive alternating wall deformation on the performance of an annular heat exchanger

Investigation of heat transfer and pressure drop of turbulent flow in tubes with successive alternating wall deformation under constant wall temperature boundary conditions

Twisted bundle heat exchangers performance evaluation by CFD (CJ12/5054)

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