Effects of different geometric structures on fluid flow and heat transfer performance in microchannel heat sinks

“…The CFD predictions showed that the SST k À x model overpredicted the local adiabatic film effect for an attached jet, while the performance for a detached jet was underpredicted. Xia et al [7] studied the effects of different geometric structures on fluid flow and heat transfer performance in microchannel heat sinks and obtained the optimal geometric parameters.…”

Section: Analysis Of Unsteady Rotor-stator Flow With Variable Viscosimentioning

confidence: 99%

Analysis of Unsteady Rotor–Stator Flow with Variable Viscosity Based on Experiments and CFD Simulations

Liu

et al. 2015

Numerical Heat Transfer, Part A: Applications

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In recent years, computational fluid dynamics (CFD) has been widely used in calculating flow characteristics and heat-flow coupling. However, heat generated during fluid transportation is always ignored and the density and viscosity of the working medium are supposed to be constant. In this article, heat generation was taken into consideration. Accordingly, the thermophysical properties working of the medium are variable. A typical rotor-stator fluid machine, a hydraulic retarder, was chosen to investigate the relationship between the heat transfer characteristics of the fluid and the braking torque. The conclusions were obtained by analyzing the flow conditions which involved Re, vorticity, and rothalpy in the flow passage and viscous dissipation. When the viscous dissipation generated heat in the passage, temperature was increased and viscosity was decreased, thus accelerating the development of turbulence. Moreover, Re was increased at the same time. Furthermore, the dissipation of vorticity was reduced constantly and rothalpy reduced. The braking torque was decreased finally because the wall shear stress was decreased. The conclusions in this article are of practical significance for forecasting other turbomachine characteristics.

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“…Comparing heat efficiencies of microchannels with different shapes (triangular, rectangular, and trapezoidal), they found that triangular microchannels have the highest heat efficiency. Xia et al (2015) numerically studied the fluid flow and heat transfer in microchannel heat sinks with different crosssectional shapes. A method that relies on the use of grooves parallel to the flow direction to increase the heat transfer, has been proposed by Moradi and Floryan (2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical Optimization of an Array of Triangular Microchannels using Constructal Theory

Mardani

Salimpour

2019

JAFM

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In the present study, an arrangement of triangular microchannels with different contact angles is analyzed and optimized following the guidelines provided by the constructal theory to reach to the maximum heat removal rate. This investigation is performed analytically and numerically. Based on the obtained results, it is emerged that this optimization is independent of the number and the type of the arrangement of the microchannels. It is also observed that increasing the pressure drop through the triangular microchannels decreases the optimal hydraulic diameter. Numerical results recommend that the microchannel with contact angle of 60° possesses the highest heat transfer rate at a given pressure drop, and decreasing the contact angle of the triangular crosssection leads to lower heat transfer rates. Comparing the analytical and numerical results of the optimal hydraulic diameter of the microchannel heat sinks, a reasonable agreement is observed; however, due to some assumptions which are considered at the analytical method, the analytical predictions of the configurations having the highest heat transfer rate are inaccurate. Therefore, the numerical optimization should be used to choose the configuration with the highest cooling capacity.

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Effects of different geometric structures on fluid flow and heat transfer performance in microchannel heat sinks

Cited by 199 publications

References 18 publications

Thermal performances of a multi-scale fluidic network

Thermal performances of a multi-scale fluidic network

Analysis of Unsteady Rotor–Stator Flow with Variable Viscosity Based on Experiments and CFD Simulations

Numerical Optimization of an Array of Triangular Microchannels using Constructal Theory

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