Analysis of flow dead zone in shell side of a heat exchanger with torsional flow in shell side

Gu, Xinjian; Chen, Weijie; Fang, Yunge; Song, Shaowen; Wang, Chaopeng; Wang, Yongqing

doi:10.1016/j.applthermaleng.2020.115792

Cited by 17 publications

(7 citation statements)

References 30 publications

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“…Therefore, the degree of fluid scouring on the wall of TFHX-DT is more intense. In sections B and C, it is found that TFHX-ST has obvious flow dead zones, which is due to that the fluid between the baffles and near the cylinder is blocked by the downstream baffles and which leads to some fluid to backflow [8]. In TFHX-DT, the flow dead zone areas of these two regions are obviously reduced.…”

Section: Effect Of Drop-shaped Tubementioning

confidence: 95%

“…The trapezoidal baffle can be cut from the segmental baffle, which also has advantages in manufacturing and installation. Since the fluid flow pattern in the shell side of the new STHX shows periodic torsion while flowing obliquely, Gu [8] named it the torsional flow heat exchanger (TFHX). The previous optimizations of the TFHXs focused mainly on the baffle, and the optimization of the heat exchange tube was not involved [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Since the fluid flow pattern in the shell side of the new STHX shows periodic torsion while flowing obliquely, Gu [8] named it the torsional flow heat exchanger (TFHX). The previous optimizations of the TFHXs focused mainly on the baffle, and the optimization of the heat exchange tube was not involved [8,9]. Therefore, it is very necessary to evaluate the performance of the TFHX by using the enhanced tube.…”

Section: Introductionmentioning

confidence: 99%

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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: Effect Of Drop-shaped Tubementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Shell and tube heat exchangers are widely used in the petrochemical industry, manufacturing industry, power production, and energy-saving system because of their simple structure, low cost, and strong design adaptability [1][2][3][4]. The shell-side fluid of the traditional segmental baffle heat exchanger flows transversely perpendicular to the tube bundle under the guidance of the segmental baffle, forming a heat transfer dead zone near the baffle [5]. At the same time, due to the transverse scouring of the tube bundle by the fluid, it is easy to stimulate fluid-induced vibration and cause damage [6].…”

Section: Introductionmentioning

confidence: 99%

Study on Behavior of the Heat Exchanger with Conically-Corrugated Tubes and HDD Baffles

Qian

2022

ChemEngineering

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Baffles with holes in different diameters (or HDD baffles) and conically-corrugated tubes are respectively longitudinal flow baffle and high-efficiency heat exchange tubes proposed by the author. In this paper, vibrations of tube bundles with HDD baffles and fluid flow as well as heat transfer inside conically-corrugated tubes were numerically simulated, and the heat exchanger with conically-corrugated tubes and HDD baffles was tested for the heat transfer efficiency. It is found that compared with the traditional segmental baffles, tube bundle vibrations in heat exchangers, if using the HDD baffles, can be significantly reduced. Regarding heat transfer efficiency, conically-corrugated tubes are much better than smooth tubes and even better than other high-efficiency heat transfer tubes. Compared with the traditional heat exchangers, heat exchangers constructed with conically-corrugated tubes and the HDD baffles can provide better heat transfer efficiency and less tube bundle vibration.

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“…[12][13][14][15] As a new type of highefficiency heat exchanger, compared with the segmental baffle heat exchanger, it has the advantages of excellent heat transfer performance, small flow resistance and less flow dead zone. 16,17 In contrast with the helical baffle heat exchanger, the fabrication and installation difficulty are greatly reduced while maintaining the better heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Application of response surface optimization technology and fluid-structure interaction in the engineering design of torsional flow heat exchangers

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Shell and tube heat exchanger is an important part of industrial heating and cooling system. Because of the harsh operating conditions, and its complex fin and baffle structure with numerous holes, it is a great challenge for engineers to design and evaluate the baffle structure on the premise of ensuring the comprehensive performance. This paper aims to provide a method to optimize the baffle structure of torsional flow heat exchanger by comprehensively considering thermal, hydraulic and mechanical properties. Based on fluid-structure interaction method, response surface methodology was applied to improve the structure configurations of torsional flow heat exchanger. The results show that the effects of various input parameters on objectives are related to each other, and the baffle width and inclination angle have a more obvious impact on heat exchanger. The tradeoff analysis is carried out for the optimization objectives, the candidate points obtained by optimization reveal that the fluid comprehensive performance of the optimal structure is increased by 10.99%, and the maximum equivalent stress is reduced by 8.74%. The research results offer theoretical guidance for the equipment maintenance and structural design of torsional flow heat exchanger.

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Analysis of flow dead zone in shell side of a heat exchanger with torsional flow in shell side

Cited by 17 publications

References 30 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

Study on Behavior of the Heat Exchanger with Conically-Corrugated Tubes and HDD Baffles

Application of response surface optimization technology and fluid-structure interaction in the engineering design of torsional flow heat exchangers

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