The Effect of Compressible Flow on Heat Transfer Performance of Heat Exchanger by Computational Fluid Dynamics (CFD) Simulation

Yu, Chao; Qin, Sicheng; Chai, Bin; Huang, Sen; Yang, Lei

doi:10.3390/e21090829

Cited by 6 publications

(4 citation statements)

References 22 publications

(25 reference statements)

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“…During the calculation, the fan rotates along the mesh section at a certain time step (0.01 s). When the change of mass flow rate in two consecutive circulatory iterations and all normalized residuals in mass and momentum conservation equations were less than 10 −4 for the differences, the solution was assumed to be converged [24][25][26][27]. The fan speed is the same as the experimental value.…”

Section: Boundary Condition Settingmentioning

confidence: 99%

Comparative Study on CFD Turbulence Models for the Flow Field in Air Cooled Radiator

Xue

Shi

et al. 2020

Processes

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This paper compares the performances of three Computational Fluid Dynamics (CFD) turbulence models, Reynolds Average Navier-Stokes (RANS), Detached Eddy Simulation (DES), and Large Eddy Simulation (LES), for simulating the flow field of a wheel loader engine compartment. The distributions of pressure fields, velocity fields, and vortex structures in a hybrid-grided engine compartment model are analyzed. The result reveals that the LES and DES can capture the detachment and breakage of the trailing edge more abundantly and meticulously than RANS. Additionally, by comparing the relevant calculation time, the feasibility of the DES model is proved to simulate the three-dimensional unsteady flow of engine compartment efficiently and accurately. This paper aims to provide a guiding idea for simulating the transient flow field in the engine compartment, which could serve as a theoretical basis for optimizing and improving the layout of the components of the engine compartment.

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Section: Boundary Condition Settingmentioning

confidence: 99%

Comparative Study on CFD Turbulence Models for the Flow Field in Air Cooled Radiator

Xue

Shi

et al. 2020

Processes

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“…However, the high-temperature and high-pressure intake air generated by a turbocharger dramatically increases the thermal and mechanical load of the internal combustion engine [3,4]. To solve the negative impact of turbocharging, engineers have developed a charge intercooler system, by placing an intercooler between the outlet of the compressor and the inlet of the engine, which could reduce the inlet temperature and increase the air density, thus improving the combustion efficiency [5][6][7]. The experiment has proven that the charge intercooling system could significantly improve engine dynamics, economy, and cleanliness without increasing the mechanical and thermal load of the engine [8].…”

Section: Introductionmentioning

confidence: 99%

Research on the Optimization of a Diesel Engine Intercooler Structure Based on Numerical Simulation

Jiang,

Wang,

Jiang

et al. 2024

Processes

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As a device for cooling charged air before it enters the cylinder, the intercooler is an indispensable part of the regular operation of a booster diesel engine. To solve the problem of the insufficient cooling performance of an intercooler for a high-power supercharged diesel engine, in this study, the flow field in the intercooler is simulated using the computational fluid dynamics (CFD) model of porous media, and the performance data measured using the steady flow test bench are used to provide boundary conditions for the calculation. The effects of the charged air mass flow rate and the tube bundle’s transverse spacing on the heat dissipation performance of the intercooler are analyzed and compared. The calculation results show that, under the condition of satisfying the regular operation of the diesel engine, the heat transfer coefficient of the intercooler heat dissipation belt increases with the increase in air mass flow and the spacing of cooling pipes, and the heat transfer coefficient can be increased by up to 57%. Still, excessive spacing of the cooling water pipes increases pressure loss in the charged air. Finally, the transverse spacing of the tube bundle is set to 17 mm, ensuring the pressure drop in the charged air, and the heat dissipation performance of the intercooler is increased by 6.04%. This paper provides a feasible solution for further optimizing the heat dissipation performance of intercoolers. Finally, grey correlation theory is used to study the correlation between air mass flow, cooling water pipe spacing, and intercooler heat dissipation performance. The correlation values are 0.8464 and 0.8497, respectively, indicating a significant relationship between air mass flow, cooling water pipe spacing, and intercooler heat dissipation performance.

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“…Several studies show that the incorporation of weak compressibility [25] and "full" compressibility [26] in turbulent flow are more accurate than that of the incompressible in the case of pump and intercooler heat exchangers. Thus, we hypothesized that it is also essential to incorporate compressibility for turbulent heat transfer of air in a square cavity.…”

Section: Introductionmentioning

confidence: 99%

Compressibility Effects on Turbulent Heat Transfer of Natural Convection in a Square Cavity

Mahmudah,

Widiatmono,

Darmawan

2023

Indonesian J Appl Phys

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<span>Heat transfer in turbulent flows is one of the essential topics in power plants and thermal-based engineering. This study aims to analyze the effects of density changes due to heat transfer in a turbulent environment—which is usually neglected because it can cause instability in a simulation. We simulate an available experimental case of turbulent heat transfer of air with OpenFOAM: one with an incompressible approach (no density change) and another with a compressible treatment. The simulation geometry is a 0.75 × 0.75 m<sup>2</sup> square cavity, where its left and right walls are kept at a temperature difference of 40 K. We compare and analyze the temperature, velocity, and turbulence kinetic energy profiles of both simulation results against the experimental data. We found that from all qualitative and quantitative comparisons, the change in density plays a vital role in turbulent heat transfer. The compressible treatment gives better results than the incompressible: the neglection of density change causes a significant difference with the experimental data. Thus, we strongly recommended incorporating compressibility in simulating heat transfer in turbulent flows.</span>

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The Effect of Compressible Flow on Heat Transfer Performance of Heat Exchanger by Computational Fluid Dynamics (CFD) Simulation

Cited by 6 publications

References 22 publications

Comparative Study on CFD Turbulence Models for the Flow Field in Air Cooled Radiator

Comparative Study on CFD Turbulence Models for the Flow Field in Air Cooled Radiator

Research on the Optimization of a Diesel Engine Intercooler Structure Based on Numerical Simulation

Compressibility Effects on Turbulent Heat Transfer of Natural Convection in a Square Cavity

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