Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

Lü, Tao; Jiang, Pei-Xue; Guo, Zhenjiang; Zhang, Y.W.; Li, H.

doi:10.1016/j.ijheatmasstransfer.2010.07.001

Cited by 37 publications

(11 citation statements)

References 41 publications

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“…Lu et al [18] investigated Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium. They find analysis of the temperature fluctuations and the power spectrum densities (PSD) at the locations having the strongest temperature fluctuations in the tee junction shows that the porous media significantly reduce the thermal fatigue effects.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of turbulent forced-convective heat transfer of Al2O3–water nanofluid with variable properties in tube

Aghaei

Sheikhzadeh

Dastmalchi

et al. 2015

Ain Shams Engineering Journal

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In this study, the flow field and heat transfer of Al 2 O 3 -water nanofluid turbulent forced convection in a tube are investigated. The surface of the tube is hot (T h = 310 K). Simulations are carried out for constant water Prandtl number of 6.13, Reynolds numbers from 10,000, 20,000, 30,000 to 100,000, nanoparticles volume fractions of 0, 0.001, 0.1, 0.2, 0.4 and nanoparticles' diameter of 25, 33, 75, and 100 nm. The finite volume method and SIMPLE algorithm are utilized to solve the governing equations numerically. The numerical results showed that with enhancing Reynolds numbers, average Nusselt number increases. The variations of the average Nusselt number relative to volume fractions are not uniform. For all of the considered volume fractions, by increasing the Reynolds number the skin friction factor decreases and with increasing volume fractions and Reynolds number the pressure drop increases. Ó 2014 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of turbulent forced-convective heat transfer of Al2O3–water nanofluid with variable properties in tube

Aghaei

Sheikhzadeh

Dastmalchi

et al. 2015

Ain Shams Engineering Journal

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“…The filtered LES equations for isothermal incompressible flows with a passive scalar h transport are (Lu et al, 2010;Majander and Siikonen, 2006;Pope, 2000;Temmerman et al, 2003;Wegner et al, 2004):…”

Section: Governing Equationsmentioning

confidence: 99%

Large-eddy simulation of thermal fatigue in a mixing tee

Ming

Zhao

2012

International Journal of Heat and Fluid Flow

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“…They concluded that a higher porosity medium could reduce the energy transfer between the solid and fluid phase [26]. Lu et al [28] simulated temperature disturbances during the mixing process of a T-junction filled with and without porous media. They implemented local thermal equilibrium model and concluded that the addition of porous media within the T-junction model lowers the temperature fluctuations during the mixing process [28].…”

Section: Introductionmentioning

confidence: 99%

A Pore-Scale Investigation of the Transient Response of Forced Convection in Porous Media to Inlet Ramp Inputs

Habib

Yadollahi

Karimi

2020

Journal of Energy Resources Technology

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This paper investigates the transient response of forced convection of heat in a reticulated porous medium through taking a pore-scale approach. The thermal system is subject to a ramp disturbance superimposed on the entrance flow temperature/velocity. The developed model consisted of ten cylindrical obstacles aligned in a staggered arrangement with set isothermal boundary conditions. A few types of fluids, along with different values of porosity and Reynolds number are considered. Assuming a laminar flow, the unsteady Navier Stokes and energy equations are solved numerically. The temporally developing flow and temperature fields as well as the surface averaged Nusselt numbers are used to explore the transient response of the system. Further, a Response Lag Ratio (RLR) is defined to compare the transient response and the input. The results reveal that an increase in amplitude increases the RLR. Nonetheless, an increase in ramp duration decreases the RLR, particularly for high density fluids. Interestingly, it is found that Reynolds number has almost negligible effects upon RLP. This study clearly reflects the importance of conducting pore-scale analyses for understanding the transient response of heat convection in porous media.

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Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

Cited by 37 publications

References 41 publications

Numerical investigation of turbulent forced-convective heat transfer of Al2O3–water nanofluid with variable properties in tube

Numerical investigation of turbulent forced-convective heat transfer of Al2O3–water nanofluid with variable properties in tube

Large-eddy simulation of thermal fatigue in a mixing tee

A Pore-Scale Investigation of the Transient Response of Forced Convection in Porous Media to Inlet Ramp Inputs

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