Double-Diffusive Natural Convection of Low Prandtl Number Liquids With Soret and Dufour Effects

Yang, Mo; Gang, Qiu; Wang, Jin; Zhang, Kun

doi:10.5098/hmt.10.24

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Zhou et al (2017) studied which turbulence model was more suitable for simulating the convective heat transfer across a single tube; the results showed that when the Reynolds numbers were low, the DNS gave good results and the LES and RSM were preferred for high Reynolds numbers. Qiu et al (2018) simulated double-diffusive natural convection under different Prandtl numbers in the horizontal cavity and found that the mass transfer intensity increased faster than the heat transfer intensity. Fusegi (1997) simulated flow and heat transfer in a 2D channel with periodic heated cavities and found that heat transfer rates were enhanced with the increase of the Womersley number.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Numerical Study of Periodically Fully-Developed Flow and Heat Transfer in Channels With Periodic Semi-Circular Tube

Zhang¹,

Yang²,

Zhang³

2019

Frontiers in Heat and Mass Transfer

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The periodically fully-developed flow and heat transfer in channels with periodic semi-circular tube is studied numerically by the direct numerical simulation (DNS), the large eddy simulation (LES), and the Reynolds stress model (RSM). When the Reynolds number is between 3000 and 25000, the Nusselt number obtained by the RSM is closer to the experimental results than the results obtained from other turbulence models. The nonlinear characteristics of flow and heat transfer is revealed based on the results of numerical simulation. When Reynolds number is high, the geometric structure and boundary conditions of the channel are symmetric, but the flow field in the channel is asymmetric. With increasing Reynolds number, the flow and heat transfer in channels experiences steady state, periodic oscillations, and finally chaos. Moreover, Nusselt number increases gradually with the decrease of tube spacing at the same Reynolds number. Among all cases considered in this paper, the maximum Nusselt number is 15.22 times of the minimum Nusselt number.

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Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Numerical Study of Periodically Fully-Developed Flow and Heat Transfer in Channels With Periodic Semi-Circular Tube

Zhang¹,

Yang²,

Zhang³

2019

Frontiers in Heat and Mass Transfer

Self Cite

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Finite element modeling of dual convection in a Y shaped porous cavity containing viscus fluid

Aslam,

Yao,

Al Mesfer

et al. 2023

Front. Phys.

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This communication analyzes the dual convection regime of Newtonian fluid flow in a Y shaped porous enclosure with heat and mass distribution, using a mathematical model of dimensionless PDEs and an effective finite element method. The top curved wall of the enclosure is assumed hot and side walls are cold while the bottom wall is assumed adiabatic. The problem is discretized using P2 and P1 finite element methods to approximate the displacement, pressure, and velocity. The linearized system of equations is solved using Newton’s iterative scheme. The study evaluates the impact of key parameters such as the Hartmann number, Lewis number, Rayleigh number, and buoyancy ratio on the flow, heat transfer rate, and mass transfer rate. Results indicate that an increase in the Hartmann number, Rayleigh numbers and buoyancy ratio amplifies both mass and heat transfer rates. The buoyancy ratio has a noteworthy impact on the flow and transfer rates, with a greater influence seen for. The study presents graphical representations of flow and temperature fields, as well as Nusselt and Sherwood numbers provide a comprehensive visualization of the results. Heat and mass transfer rate is minimum for concentration dominated counter flow (N=−2) and maximum for concentration dominated assisting flow N=2.

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Double-Diffusive Natural Convection of Low Prandtl Number Liquids With Soret and Dufour Effects

Cited by 2 publications

References 24 publications

Numerical Study of Periodically Fully-Developed Flow and Heat Transfer in Channels With Periodic Semi-Circular Tube

Numerical Study of Periodically Fully-Developed Flow and Heat Transfer in Channels With Periodic Semi-Circular Tube

Finite element modeling of dual convection in a Y shaped porous cavity containing viscus fluid

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