Numerical investigation of thermal-hydraulic performance of a heat exchanger tube with helical dimples

Xie, Shuai; Guo, Zhengwei; Gong, Yinchun; Dong, Chaoqun; Liu, Jianxun; Ren, Liancheng

doi:10.1016/j.ijthermalsci.2022.107530

Cited by 28 publications

(3 citation statements)

References 26 publications

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“…The results of those studies indicated that the heat transfer enhancement could reach 40% with negligible pressure drop [7]. Xie et al [8] investigated the effects of the number of starts, radius, spiral pitch, depth, and transverse length of a helically dimpled tube on its thermal-hydraulic performance. The correlations for Nu and f were obtained.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…[16] Numerically studied the performance of a double-pipe helical coil heat exchanger in the laminar flow regime and found the effect factors. Shuai Xie [17] proposed a novel type of tube with helical dimples and numerically investigated its turbulent heat transfer and flow resistance. The results indicated that the spiral pitch, transverse length, number of starts, depth, and radius would influence on the performance.…”

Section: Introductionmentioning

confidence: 99%

Research on the Thermal Performance of a Helical Coil Heat Exchanger

Zhang¹,

Liu²

2022

Proceedings of the International Conference of Fluid Power and Mechatronic Control Engineering (ICFPMCE 2022)

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Helical coil heat exchanger has been widely used in hydraulics engineering, and plays an important role in modern industry. The distribution of fluid field which would be influenced by helical coil structural parameters is an important factor affecting its thermal performance. In this paper, CFD analysis is conducted to study the effects of the inlet flow, the mid-diameter of coils, the pitch, and the number of helical coil turns on the thermal performance of a heat exchanger. Results show that the outlet temperature and pressure drop of the helical coil heat exchanger are affected significantly by the inlet mass flow rate, and varies with the mid-diameter and pitch. And it approximately linearly increases with the number of coil turns.

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“…The study of the influence of Reynolds number on the overall flow and heat transfer characteristics in micro-tubes is helpful to understand the synergy between them and will promote the research and development of heat management systems. There is much existing research conducted on the overall characteristics of heat transfer and flow in the micro-tube through the methods of experiment measurement [1][2][3][4] and numerical simulation [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Reynolds Number on the Overall Characteristics of Flow and Heat Transfer in the Long Micro-Tube with Dimples

Chen²,

Xu³

et al. 2022

Processes

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The flow and heat transfer characteristics in micro-tube are very important research fields. In order to study the influence of the Reynolds number on the overall characteristics of flow and heat transfer, a 510 mm long micro-tube with dimples was constructed. Thirty-five different working conditions are considered, and the Reynolds number is between 1500 and 8100. At the same time, the change of physical properties of coolant with temperature is considered. The reliability of numerical simulation results is verified by the grid independence verification and the comparison of experimental data. The results show that the dimple will promote the instability of the flow state and improve the heat transfer efficiency. The flow state evolution formed in the stream-wise direction is basically similar, and its fully developed position remains at 76 mm, which is independent of the Reynolds number. For the fully developed region, the partial derivation of static pressure in the stream-wise component has a quasi-linear relationship with the stream-wise direction. With the development in the stream-wise direction, the partial derivation of static temperature in the steam-wise component decreases. With the increase of Reynolds number, the friction factor f and heat transfer factor j decrease. The ratio of factor heat transfer f to Reynolds number relative collapses for the different cases, especially when the Reynolds number is larger than 3800. The heat transfer factor j is an exponential function of the Reynolds number and decreases with the increased Reynolds number.

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Numerical investigation of thermal-hydraulic performance of a heat exchanger tube with helical dimples

Cited by 28 publications

References 26 publications

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

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

Research on the Thermal Performance of a Helical Coil Heat Exchanger

Effects of Reynolds Number on the Overall Characteristics of Flow and Heat Transfer in the Long Micro-Tube with Dimples

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