Analysis on thermal hydraulic performance of the elliptical tube in the finned-tube heat exchanger by new method

Wang, Qiang; Qian, Zuoqin; Cheng, Junlin; Huang, Weilong; Ren, Jie

doi:10.1016/j.ijheatmasstransfer.2019.01.001

Cited by 20 publications

(6 citation statements)

References 25 publications

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“…The results indicated that the streamlined non-circular tubes have lower pressure drop, and the entropy production of elliptical and wing-shaped tubes is small when the Reynolds number is bigger than 15000. Wang et al [19] modified the circular tube into semicircle and semi-elliptical streamlined sections to reduce the Karman vortex street effect. After the modification, the wake area of the tube is reduced.…”

Section: Introductionmentioning

confidence: 99%

Study on characteristics of fluid-flow and heat transfer in the torsional flow heat exchanger with drop-shaped tube

et al. 2022

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Adopting enhanced tube is an effective way to enhance the performance of a shell-and-tube heat exchanger. In this paper, a drop-shaped tube with streamlined cross-section was used to enhance heat transfer of the torsional flow heat exchanger. The characteristics of the fluid flow and heat transfer in torsional flow heat exchanger with drop-shaped tube were studied numerically, considering three kinds of axis ratios (a/b=1.5, 1.8, 2) of the tube. The reliability of numerical results was verified through experimental results. The results indicate that the wake size of the streamlined drop-shaped tube is smaller than that of the conventional smooth tube, and the drop-shaped tube reduces the flow dead zone in torsional flow heat exchanger. As the axis ratio of a/b increases, the shell side Nusselt number and comprehensive performance increase, due to enhancement of the turbulence kinetic energy of the transition section. When the axis ratio is 2, the Nusselt number is increased by 12.44-18.99%, and the comprehensiveness is increased by 13.27-19.2%, compared with the torsional flow heat exchanger with the smooth tube. The quantitative analysis of the velocity indicates that the relative magnitude and proportion of transverse velocity components of fluid are important factors affecting the thermal-hydraulic performance of torsional flow heat exchanger.

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Section: Introductionmentioning

confidence: 99%

Study on characteristics of fluid-flow and heat transfer in the torsional flow heat exchanger with drop-shaped tube

et al. 2022

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“…Tubes of water heater heat exchanger always are circle tube [9,10] or elliptic tube [2,10,11]. The elliptic tube structure has a better aerodynamics configuration and a lower total drag force than circle tube.…”

Section: Introductionmentioning

confidence: 99%

Structure design and thermal-hydraulic performances study on tube-on-sheet heat exchanger

Wang

Gao

et al. 2021

THERM SCI

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A numerical investigation is performed to study the thermal-hydraulic performances of tube-on-sheet heat exchanger. Especially, this paper is focused on the effects of the structure parameters (fin angles, fin lengths, fin pitches, fin widths and tube arc radius) on the thermal-hydraulic characteristics of the heat exchanger. The heat exchanger optimized structural parameters are obtained. The results reveal that main structure parameters on thermal-hydraulic performance are fin angle, fin length, fin pitch and fin width. Furthermore, decreasing the fin angle, fin pitch and fin width or increasing the fin length cause thermal hydraulic performance to increase. In addition, main structure parameters on low temperature corrosion are tube arc radius and fin length. Decreasing the tube arc radius and fin length can mitigate low temperature corrosion. Furth, stainless steel is choosing as the material for the heat exchanger to reduce corrosion.

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“…While the friction factor, f, is decreased by 85%-89% as compared with the round tubes, the heat transfer over the friction factor (Nu/f) is enhanced by 5 times as compared with the round tubes. In this direction, Wang et al (2019) presented an approach for proposing an effective heat exchanger with alternating the tube geometric configuration. Two modified tube geometric configurations, including both made of semielliptical tube and semicircular tube, were designed and investigated.…”

Section: Introductionmentioning

confidence: 99%

Different tube bundles effect on the shell-and-tube heat exchanger performance

Arani

Uosofvand

2021

HFF

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Purpose This paper aims to present a numerical investigation on laboratory-scale segmental baffles shell-and-tube heat exchanger (STHX) having various tube bundles and baffle configuration. Design/methodology/approach To discover the higher performance the thermohydraulic behavior of shell-side fluid flow with circular, elliptical and twisted oval tube bundles with segmental and inclined segmental baffled is compared. Shell side turbulent flow and heat transfer are simulated by a finite volume discretization approach using SolidWorks Flow Simulation. To achieve greater configuration performance of this device, the following two approaches is considered: using the inclined baffle with 200 angles of inclination and applying the different tube bundle. Findings Different parameters as heat transfer rate, pressure drop (Δp), heat transfer coefficient (h) and heat transfer coefficient to pressure drop ratio (h/Δp) are presented and discussed. Besides, for considering the effect of pressure penalty and heat transfer improvement instantaneously, the efficiency evaluation coefficient (EEC) in the fluid flow and heat transfer based on the power required to provide the real heat transfer augmentation are used. Originality/value Obtained results displayed that, at the equal mass flow rate, the twisted oval tubes with segmental baffle decrease the pressure drop 53.6% and 35.64% rather than that the circular and elliptical tubes bundle, respectively. By comparing the (h/Δp) ratio, it can result that the STHX with twisted oval tubes bundle (both segmental and inclined baffle) has better performance than other kinds of the tube bundles. Present results showed that the values of the EEC for all provided models are higher than 1, except for elliptical tube bundles with segmental baffles. The STHX with twisted oval tube bundles and segmental baffle gives the highest EEC value equal to 1.16 in the range of investigated mass flow.

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Analysis on thermal hydraulic performance of the elliptical tube in the finned-tube heat exchanger by new method

Cited by 20 publications

References 25 publications

Study on characteristics of fluid-flow and heat transfer in the torsional flow heat exchanger with drop-shaped tube

Study on characteristics of fluid-flow and heat transfer in the torsional flow heat exchanger with drop-shaped tube

Structure design and thermal-hydraulic performances study on tube-on-sheet heat exchanger

Different tube bundles effect on the shell-and-tube heat exchanger performance

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