Numerical comparison of thermal and hydraulic performances for heat exchangers having circular and elliptic cross-section

Doğan, Sercan; Darıcı, Selçuk; Özgören, Muammer

doi:10.1016/j.ijheatmasstransfer.2019.118731

Cited by 42 publications

(13 citation statements)

References 41 publications

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“…Here, the perimeter of drop-shaped tube is constant same as the perimeter of the smoothly twisted 90° transition section (L t ) to realize the alternate twist of the cross-section. The overall model of TFHX-DT with a/b ratios of 1.5, 1.8, 2 are established respectively [15,26], as illustrated in fig. 1.…”

Section: Geometrical Modelmentioning

confidence: 99%

“…Based on this, the streamlined tubes that can be extruded from smooth tubes have attracted attention. Dogan et al [15] compared the performance of elliptical tube (axial ratio within 0.307-1) and smooth tube in plain fin heat exchangers. The streamline model illustrated that the wake area of the smooth tube is active and has a higher pressure drop, while the wake size of the elliptical tube is smaller and decreases with the decrease of axial ratio.…”

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: Geometrical Modelmentioning

confidence: 99%

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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“…Many researchers have worked on the analysis of heat exchangers using computational fluid dynamics method [3][4][5][6][7]. Doğan et al, [8] compared the thermal and hydraulic performances of circular and elliptical tube heat exchangers using computational fluid dynamics method. First, the obtained data of finned and circular pipe design were verified and compared with the performance results of finned and circular pipe design in the literature.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis of double tube heat exchanger with wavy inner tube

Hasgül

Çakmak

2022

THERM SCI

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In this study, the effect of the design on the heat transfer is numerically investigated by using the "wavy inner tube" in a double-pipe heat exchanger. A wavy inner tube was used in the design to give a turbulent effect to the fluid along the inner tube of a double tube heat exchanger. In numerical study, ANSYS 12.0 Fluent code program was used, and the basic protection equations were solved for steady-state, three-dimensional and turbulent flow conditions. The study was examined at Reynolds numbers ranging from 2700 to 5300. The obtained results were compared with the experimental data performed under the same conditions. As a result of this comparison, after it was seen that the results obtained from the numerical analysis and the experimental results were compatible with each other, the wave number of the inner tube was increased and analyzed with the ANSYS fluent code program. When the data obtained as a result of the analyzes were evaluated, it was seen that the highest heat transfer was obtained from the 16 wave tube heat exchanger, which has the highest number of waves and under counter flow conditions. The increase in heat transfer increased by 270% compared to the straight tube.

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“…Depending upon the shape and cross-section of the duct, the fluid has various velocity distribution. Ducts with different shapes such as rectangular, circular, trapezoidal and triangular are commonly used in several applications particularly heat exchangers (such as trapezoidal crosssection [1,2], circular cross-section [3], and elliptic crosssection [4]), cooling systems (like microscale cooling [5], vortex cooling [6], and circular cooling [7]) and microchannels (for example arbitrary cross-section [8,9], trapezoidal cross-section [10,11], circular cross-section [12,13]).…”

Section: Introductionmentioning

confidence: 99%

Impact of round edge on the duct fluid flow: analytical investigation

et al. 2021

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The present study aims to investigate the effect of the round edge on the laminar Newtonian fluid that flows through a channel. As an innovation, the sine and cosine transform functions are employed to solve the momentum governing equation in Cartesian and Cylindrical coordinates. Owing to the duct symmetric, only the quarter of the cross-section (θ = 0 to π/2) is analyzed. The analytical correlations for velocity distribution in both coordinates are provided; afterward, the effect of the round edge on the velocity profile has been investigated. It can be concluded that if a circular cross-section is replaced with a non-circular cross-section, the velocity profile becomes more uniform and less velocity variation is observed. Further, with a constant pressure gradient, among rectangular, round edge and circular cross-sections, the maximum velocity in a circular cross-section becomes minimum. In addition, it is observed that for the same pressure difference, an increase of m value leads to the higher average velocity and mass flow.

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Numerical comparison of thermal and hydraulic performances for heat exchangers having circular and elliptic cross-section

Cited by 42 publications

References 41 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

Heat transfer analysis of double tube heat exchanger with wavy inner tube

Impact of round edge on the duct fluid flow: analytical investigation

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