An experimental study of flow and heat transfer in a differentially side heated cavity filled with coarse porous media

Ataei-Dadavi, Iman; Rounaghi, Nima; Chakkingal, Manu; Kenjereš, Saša; Kleijn, Chris R.; Tummers, M.J.

doi:10.1016/j.ijheatmasstransfer.2019.118591

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…Sivaraj and Sheremet 24 worked on cooling a central thin isothermally heater in a porous environment by applying Rosseland approximation. Ataei-Dadavi et al 25 published an experimentally work on cooling hot walls in a rough, porous environment. In their case, they indicated that cooling is decreased unless the rough, porous environment is very conductive.…”

Section: Introductionmentioning

confidence: 99%

Analysis of combined radiation and convection heat transfer inside a porous medium with heat source electronic devices

Nobakhti

Aghanajafi

Khayat

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, a numerical study is performed on the cooling phenomenon of three heat source electronic devices. The electronic devices are cooled in the form of natural heat transfer by the airflow in a porous medium. Electronic devices are installed on the boundary walls of a square environment. Cooling simulations are performed by drawing flow lines and constant temperature lines. Our main goal is to find the highest cooling rate in different Darcy numbers and different Rayleigh numbers in our investigation. The range of Darcy numbers and Rayleigh numbers is between 0.0001 to 0.01 and 1000 to 100,000, respectively. Our investigation showed the maximum cooling is obtained at the Darcy number of about 0.01. And also, by decreasing the value of Darcy number, a higher cooling rate for the hot boundary walls is achieved.

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Section: Introductionmentioning

confidence: 99%

Analysis of combined radiation and convection heat transfer inside a porous medium with heat source electronic devices

Nobakhti

Aghanajafi

Khayat

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…If the Biot number is much larger than one 58 , meaning that the local thermal equilibrium does not hold, two temperature distributions should be separately calculated for the fluid and solid phases, as shown by Eq. ( 9) and (10).…”

Section: The Effective Density ρ Effmentioning

confidence: 99%

“…( 5), on the upscaled behavior, non-Newtonian fluid flow in a spatially uncorrelated network at the highest volume flow rate was also simulated and compared with the non-equilibrium case, using Eqs. ( 9) and (10). The spatial temperature distribution and the dependence of the average temperature on the distance from center for the two cases at the breakthrough time are plotted in Fig.…”

Section: B Local Thermal Equilibrium Versus Non-equilibrium Conditionsmentioning

confidence: 99%

“…To study thermal transport in flow of a Newtonian fluid through porous media, many experimental, analytical, and numerical approaches have been proposed. For example, based on the particle image velocimetry (PIV) and liquid crystal thermography (LCT) measurements, the porescale velocity and temperature distribution were generated and visualized in a refractive indexmatched porous medium 10 . Accurate recording of the dynamic evolution of the temperature in 3D porous media, particularly at pore-scale, is still an unsolved problem.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced thermal fingering in a shear-thinning fluid flow through porous media: Dynamic pore network modeling

Sahimi

Shende

et al. 2022

Physics of Fluids

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Thermal-viscous fingering instability in porous media is a common phenomenon in nature as well as in many scientific problems and industrial applications. Despite the importance, however, thermal transport in flow of a non-Newtonian fluid in porous media and the resulting fingering has not been studied extensively, especially if the pore space is heterogeneous. In this paper, we propose a pore network model with full graphics processing unit-parallelized acceleration to simulate thermal transport in flow through three-dimensional unstructured pore networks at centimeter scale, containing millions of pores. A thermal Meter equation is proposed to model temperature- and shear stress-dependent rheology of the non-Newtonian fluids. After comparing the simulation results with an analytical solution for the location of the thermal front in a spatially uncorrelated pore network, thermal transport in flow of both Newtonian and non-Newtonian fluids is studied in the spatially uncorrelated and correlated pore networks over a range of injection flow rates. The simulations indicate that the injection flow rate, the shear-thinning rheology, and the morphological heterogeneity of the pore space all enhance thermal-viscous fingering instability in porous media, but with distinct patterns. In spatially correlated networks, the average temperature and apparent viscosity at the breakthrough point in flow of a shear-thinning fluid exhibit non-monotonic dependence on the injection flow rate. An analysis of the fractal dimension of thermal patterns at the breakthrough point supports the conclusion. The results highlight the importance of designing optimal flow conditions for application purposes.

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“…The results showed that the agreement relation between the Reynolds number and Nusselt number, as well as the Richardson number value, rises at the same value of Reynolds number leading to the Nusselt number rise within the cavity. An experimental investigation of fluid flow and heat transfer in the cavity of a cubic geometry with different heated side, and large solid spheres that create a tough porous medium filling the cavity was conducted by [13]. The results of the variations of Nusselt numbers, which were calculated for different Rayleigh numbers, found that the average Nusselt number is reduced due to forming stratification layers of the spheres next to the cold or hot walls generally.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Analysis of transient mixed convection in a horizontal channel partially heated from below

Mashkour

2021

EEJET

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The heat convection phenomenon has been investigated numerically (mathematically) for a channel located horizontally and partially heated at a uniform heat flux with forced and free heat convection. The investigated horizontal channel with a fluid inlet and the enclosure was exposed to the heat source from the bottom while the channel upper side was kept with a constant temperature equal to fluid outlet temperature. Transient, laminar, incompressible and mixed convective flow is assumed within the channel. Therefore, the flow field is estimated using Navier Stokes equations, which involves the Boussinesq approximation. While the temperature field is calculated using the standard energy model, where, Re, Pr, Ri are Reynolds number, Prandtl number, and Richardson number, respectively. Reynolds number (Re) was changed during the test from 1 to 50 (1, 10, 25, and 50) for each case study, Richardson (Ri) number was changed during the test from 1 to 25 (1, 5, 10, 15, 20, and, 25). The average Nusselt number (Nuav) increases exponentially with the Reynold number for each Richardson number and the local Nusselt number (NuI) rises in the heating point. Then gradually stabilized until reaching the endpoint of the channel while the local Nusselt number increases with a decrease in the Reynolds number over there. In addition, the streamlines and isotherms patterns in case of the very low value of the Reynolds number indicate very low convective heat transfer with all values of Richardson number. Furthermore, near the heat source, the fluid flow rate rise increases the convection heat transfer that clarified the Nusselt number behavior with Reynolds number indicating that maximum Nu No. are 6, 12, 27 and 31 for Re No. 1, 10, 25 and 50, respectively

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An experimental study of flow and heat transfer in a differentially side heated cavity filled with coarse porous media

Cited by 21 publications

References 29 publications

Analysis of combined radiation and convection heat transfer inside a porous medium with heat source electronic devices

Analysis of combined radiation and convection heat transfer inside a porous medium with heat source electronic devices

Enhanced thermal fingering in a shear-thinning fluid flow through porous media: Dynamic pore network modeling

Analysis of transient mixed convection in a horizontal channel partially heated from below

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