Numerical analysis of mixed convection in three‐dimensional rectangular channel with flush‐mounted heat sources based on field synergy principle

Cheng, Yongpan; Lee, T. S.; Low, H. T.

doi:10.1002/fld.1218

Cited by 8 publications

(6 citation statements)

References 28 publications

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“…The synergy angle of buoyant-aiding flow is greater while the buoyant-opposing flow is significantly less than that of natural convection flow when AR = 1. This result is leads to the fact that the relation between temperature field and velocity at buoyant-aiding flow is at the worst situation, and leads to the increasing values of ̅̅̅̅ [42].…”

Section: Field Synergy Anglementioning

confidence: 99%

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

Rani¹,

Narayana²,

Rameshwar³

2019

MMEP

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In the present study natural convective flow of air in a two dimensional cavity with three different aspect ratios (AR) are analyzed using direct numerical simulation. Established open source CFD package OpenFOAM, has been utilized to run the simulation. In this problem, the vertical walls are assumed to be maintained at an isothermal temperature with left vertical wall has high temperature than the right wall and the other walls are assumed to be thermally insulated. The governing equations of this problem are expressed in dimensionless form and are solved by using the finite volume method. For spatial derivatives, the second order upwind linearization technique was used. The CGS method was employed as an effective acceleration means. The divergent and Laplacian terms in the governing equations are discretized by the QUICK and Gauss linear schemes, respectively. The computations are conducted for Rayleigh number until 10 6. An attempt has been made to gather the visualization techniques such as streamlines, isotherms, energy streamlines and field synergy principle to analyse the flow behavior. When Ra is small, vertical energy streamlines appeared, as Ra further increases, free energy streamlines at the boundary are observed whereas trapped energy streamlines at the centre appeared in the horizontal direction. For a fixed Ra, as AR increases, average synergy angle () increases. This result implies that synergy between temperature field and velocity gets worse, which leads to the mild growth rate of ̅̅̅̅. The field synergy principle shows that the improving synergy between the temperature gradient and velocity vector, the heat transfer can be enhanced with less increased flow resistance.

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Section: Field Synergy Anglementioning

confidence: 99%

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

Rani¹,

Narayana²,

Rameshwar³

2019

MMEP

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“…Four sample separation distances (d), ranging from 2 to 40 mm, were investigated. The non-dimensional governing equations for this 3D steady incompressible flow can be expressed as follows 18,19 Continuity equation…”

Section: Cfd Simulationmentioning

confidence: 99%

“…The non-dimensional governing equations for this 3D steady incompressible flow can be expressed as follows 18,19…”

Section: Cfd Simulationmentioning

confidence: 99%

CFD modelling of nitrogen gas flow pattern during sintering of Al–7Zn–2.5Mg–1Cu alloy and its effect on distortion

et al. 2014

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The effects of gas flow pattern on the distortion in Al-7Zn-2.5Mg-1Cu alloy were experimentally examined by sintering three rectangular samples, equally spaced 2-40 mm, in each batch at 620uC for 45 min under flowing nitrogen. A three-dimensional (3D) computational fluid dynamics (CFD) model was developed to investigate the gas flow behaviour surrounding three samples during isothermal sintering. Streamlines, gas flowrate into each cavity between two adjacent samples and wall shear stress distribution along the surfaces of each sample were found dependent on sample separation distance. The flow patterns could affect the distortion levels of the three samples by changing the oxygen content in the local sintering atmosphere and the evaporation rates of Mg and Zn from the sintering surfaces. The 3D CFD model developed was also applied to the experimental design of the sintering of six samples to ensure minimum distortion as well as maximum densification.

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“…In the calculation of thermal flowmeter flow and heat transfer, the device structure is commonly simplified as a one-dimensional channel with a single source [ 7 ], two-dimensional channel with single [ 8 , 9 , 10 , 11 , 12 ] or multiple [ 13 , 14 , 15 , 16 ] heat sources, and three-dimensional channel with multiple heat sources [ 17 ]. Komiya [ 7 ] was the first to provide an analytical solution for the one-dimensional thermal flowmeter.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Characteristics of Convection and Temperature Evolution in Microchannel of Thermal Flowmeter

Che

et al. 2023

Micromachines

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During practical usage, thermal flowmeters have a limited range of applications. The present work investigates the factors influencing thermal flowmeter measurements and observes the effects of buoyancy convection and forced convection on the flow rate measurement sensitivity. The results show that the gravity level, inclination angle, channel height, mass flow rate, and heating power affect the flow rate measurements by influencing the flow pattern and the temperature distribution. Gravity determines the generation of convective cells, while the inclination angle affects the location of the convective cells. Channel height affects the flow pattern and temperature distribution. Higher sensitivity can be achieved with smaller mass flow rates or higher heating power. According to the combined influence of the aforementioned parameters, the present work investigates the flow transition based on the Reynolds number and the Grashof number. When the Reynolds number is below the critical value corresponding to the Grashof number, convective cells emerge and affect the accuracy of flowmeter measurements. The research on influencing factors and flow transition presented in this paper has potential implications for the design and manufacture of thermal flowmeters under different working conditions.

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Numerical analysis of mixed convection in three‐dimensional rectangular channel with flush‐mounted heat sources based on field synergy principle

Cited by 8 publications

References 28 publications

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

Analysis of Aspect Ratio Effects of Left Heated 2D Cavity Using Energy Streamlines and Field Synergy Principle

CFD modelling of nitrogen gas flow pattern during sintering of Al–7Zn–2.5Mg–1Cu alloy and its effect on distortion

Numerical Study on Characteristics of Convection and Temperature Evolution in Microchannel of Thermal Flowmeter

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