Numerical investigation of heat transfer enhancement in heat sinks using multiple rows vortex generators

Fathi, Shayan; Yazdi, Mohamad Eftekhari; Adamian, Armen

doi:10.15632/jtam-pl/115308

Cited by 7 publications

(2 citation statements)

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“…Therfore, the air-side thermal resistance strongly affect the heat exchange capacity of finned tube heat exchangers. For this reason, numerous attempts have been devoted to enhancing heat transfer at the air-side of finned tube heat exchangers [ 2 ], such as plain [ 3 ], wavy [ 4 ], and spiral [ 5 ] fin, helical wires [ 6 ], vortex generators and so on [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Zhang

Wang

Liu

et al. 2022

Entropy

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Heat transfer and frictional performance at the air-side is predominant for the application and optimization of finned tube heat exchangers. For aerospace engineering, the heat exchanger operates under negative pressure, whereas the general prediction models of convective heat transfer coefficient and pressure penalty for this scenario are rarely reported. In the current study, a numerical model is developed to determine the air-side heat transfer and frictional performance. The influence of air pressure (absolute pressure) is discussed in detail, and the entropy generation considering the effect of heat transfer and pressure drop are analyzed. Furthermore, prediction models of air-side thermal and frictional factors are also developed. The results indicate that both the convective heat transfer coefficient and pressure penalty decrease significantly with decreasing air pressure, and the air-side heat transfer coefficient is decreased by 64.6~73.3% at an air pressure of 25 kPa compared with normal environment pressure. The entropy generation by temperature difference accounts for the highest proportion of the total entropy generation. The prediction correlations of Colburn j-factor and friction factor f show satisfactory accuracy with the absolute mean deviations of 7.48% and 9.42%, respectively. This study can provide a reference for the practical application of fined tube heat exchangers under a negative pressure environment.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Zhang

Wang

Liu

et al. 2022

Entropy

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“…In comparison to other perforation shapes and non-perforated heat sinks, the heat sink with circular perforation has the highest heat transfer capability. Also, Fathi et al [4] investigated five different geometries of heat sinks by finite volume simulation. The results revealed that the wavy form had the best heat transfer performance among the heat sink geometries studied.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Air-Cooling on Metal Heat Sinks Using Numerical Modelling

Rakpakdee¹,

Thungthong²,

Chaiworapuek³

et al. 2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

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In this paper, air-cooling models are investigated numerically on a new design of metal fin heat sinks based on the motor of the motorcycle using the Computational Fluid Dynamics (CFD) package ANSYS Fluent. The standard k -ε turbulence model was used in the numerical simulation. The domain was a rectangular geometry, and the metal fins created in the numerical model had three types: square pin, circle short pin, and circle long pin. These metal fin models were heated by a heat source at a power of 150-200 W based on the working range of the motorcycle's motor. Also, the air velocity for cooling was in the range of 40-60 km/h based on the motorcycle's speed. The temperature contours of the three models were used to compare the heat dissipation. The results showed that the thermal resistance did not change significantly when the heat source was changed. Notably, the circle long pin had the best effectiveness in dissipating heat compared to the others. The results from this research were important information that will help design and develop the heat sinks of the motor in the future.

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