Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes

Liu, Zhanwei; Yue, Yanwei; She, Luchao; Fan, Guangming

doi:10.3389/fenrg.2019.00064

Cited by 11 publications

(2 citation statements)

References 28 publications

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“…Where t in and t out are the inlet and the outlet temperatures of cooling air, q V is the volume flow rate, ρ and c p are the density and the specific heat capacity of cooling air, respectively. Then, the Nusselt number is expressed as (Liu et al, 2019;Wang B. et al, 2020):…”

Section: Technological Notesmentioning

confidence: 99%

Quantifying Heat Transfer Characteristics of the Kroll Reactor in Titanium Sponge Production

Wang

2021

Front. Energy Res.

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Various reactors with different sizes have been widely used for the production of titanium sponge in the Kroll process. But the further commercialization of the forced heat transfer design of the Kroll reactor is limited by lack of standard parameter to evaluate its convective heat transfer characteristics. This work proposes to evaluate and compare the Kroll reactor with the dimensionless Nusselt number. The results shown that the heat transfer coefficients for both surfaces increase with the volume flow rate of cooling air for each dimensionless temperature, and the heat transfer coefficients of the external surface of the reactor are higher than that of the internal surface of the heater. And new correlations regarding the Nusselt number between the cooling air and the external surface of the reactor or the internal surface of the heater are obtained based on experimental data, while the characteristics of the cooling air, equipment and operation parameters are considered.

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Section: Technological Notesmentioning

confidence: 99%

Quantifying Heat Transfer Characteristics of the Kroll Reactor in Titanium Sponge Production

Wang

2021

Front. Energy Res.

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“…The effects of different structure parameters (fin number, diameter, helix angle, width, and fin height) on the heat transfer performance were studied. Lie et al [14]. found that Nu and f both increased as the values of these parameters increased and that the helical angle had the strongest effect on the heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 97%

Experimental and Numerical Investigations on Thermal-Hydraulic Performance of Three-Dimensional Overall Jagged Internal Finned Tubes

Huang,

Deng,

Chen

et al. 2024

Micromachines

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To satisfy the demand for efficient heat transfer, a novel three-dimensional overall jagged internal finned tube (3D-OJIFT) was fabricated, using the rolling–ploughing/extruding method. The thermal performance of the 3D-OJIFT were studied and compared in experiments and three-dimensional numerical simulations. The RNG k-ε turbulence model is well verified with the experimental results. By analyzing the distributions of velocity, temperature, and turbulence kinetic energy, it was found that the 3D-OJIFT destroyed the development of the velocity and thermal boundary layers, increased the turbulence disturbance, and reduced the temperature gradient, thus improving the heat transfer. The influences of the jagged height and jagged spiral angle of the 3D-OJIFT are discussed. The Nu and f increased as the jagged height of the 3D-OJIFT increased. The Nusselt number of the 3D-OJIFT was 1.67–2.04 times the value for the smooth tube. In addition, the comprehensive heat transfer performance of the 3D-OJIFT improved after increasing the jagged spiral angle. Compared with conventional internal helical-finned tubes and other reinforcement structures reported in the literature, the 3D-OJIFT demonstrated better comprehensive heat transfer performance. Finally, empirical correlations of the 3D-OJIFT were obtained.

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A Parametric Investigation of Fin Geometries for Heat Transfer Enhancement in Internally Finned Tubes

Agrawala,

Arora,

Lilhare

2024

Recent Advances in Thermal Engineering

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Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes

Cited by 11 publications

References 28 publications

Quantifying Heat Transfer Characteristics of the Kroll Reactor in Titanium Sponge Production

Quantifying Heat Transfer Characteristics of the Kroll Reactor in Titanium Sponge Production

Experimental and Numerical Investigations on Thermal-Hydraulic Performance of Three-Dimensional Overall Jagged Internal Finned Tubes

A Parametric Investigation of Fin Geometries for Heat Transfer Enhancement in Internally Finned Tubes

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