Visualization of heat flow using Bejan’s heatline due to natural convection of water near 4 °C in thick walled porous cavity

Varol, Yasin; Öztop, Hakan F.; Mobedi, Moghtada; Pop, I.

doi:10.1016/j.ijheatmasstransfer.2010.01.020

Cited by 34 publications

(6 citation statements)

References 20 publications

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“…Mobedi et al [5] also divided heatfunction equation into the diffusion and convection heatfunctions by using superposition rule. Varol et al [6] used heatline patterns to study natural convection heat transfer of cold water near 4°C in a thick bottom walled cavity filled with a porous medium. Kaluri et al [7] performed a numerical study on heat distribution and thermal mixing for steady laminar natural convective flow within fluid-saturated porous square cavities by using heatline technique.…”

Section: Introductionmentioning

confidence: 99%

Visualization of heat flow in a vertical channel with fully developed mixed convection

Çelik

Mobedi

2012

International Communications in Heat and Mass Transfer

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A study on visualization of heat flow in three channels with laminar fully developed mixed convection heat transfer is performed. The first channel is filled with completely pure fluid; the second one is completely filled with fluid saturated porous medium. A porous layer exists in the half of the third channel while another half is filled with pure fluid. The velocity, temperature and heat transport fields are obtained both by using analytical and numerical methods. Analytical expression for heat transport field is obtained and presented. The heatline patterns are plotted for different values of Gr/Re, thermal conductivity ratio, Peclet and Darcy numbers. It is found that the path of heat flow in the channel strongly depends on Peclet number. For low Peclet numbers (i.e., Pe = 0.01), the path of heat flow is independent of Gr/Re and Darcy numbers. However, for high Peclet numbers (i.e., Pe = 5), the ratio of Gr/Re, Darcy number and thermal conductivity ratio influence heatline patterns, considerably. For the channels with high Peclet number (i.e., Pe = 5), a downward heat flow is observed when a reverse flow exits.

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Section: Introductionmentioning

confidence: 99%

Visualization of heat flow in a vertical channel with fully developed mixed convection

Çelik

Mobedi

2012

International Communications in Heat and Mass Transfer

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“…The dimensionless form of heat function for a two-dimensional convection problem can be defined as [23]: Table 1 Comparison of the Nu between the present and the results of Ref. [12] for Gr = 2 Â 10 4 , Pr = 0.054 and Bi = 0.…”

Section: Heatlinesmentioning

confidence: 99%

“…In order to visualize heat flow, the heatline concept proposed by Kimura and Bejan [18] may be used. Many authors have applied the heatlines concept to visualize and analyze the heat flow driven by convection in a cavity [19,20,22,21,23,17,[24][25][26][27][28][29]. The aim of this work is to visualize and analyze surface tension and convective cooling effects on a differentially heated square enclosure using the heatline concept.…”

Section: Introductionmentioning

confidence: 99%

Visualization and analysis of surface tension and cooling effects on differentially heated cavity using heatline concept

Saleh¹,

Arbin²,

Roslan³

et al. 2012

International Journal of Heat and Mass Transfer

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“…The results show that the aspect ratio of 3 enhances the density inversion. Varol et al [5] investigated a rectangular cavity with porous media. Flow pattern and isotherms have been presented and analyzed in this study at different Rayleigh numbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Natural Convection and Entropy Generation of Water near Density Inversion in a Cavity Having Circular and Elliptical Body

Phu¹,

Hap²

2021

Computational Overview of Fluid Structure Interaction

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In this chapter, a water-filled square cavity with left hot wall and right cold wall was numerically investigated. The hot and cold wall temperatures are 10°C and 0°C respectively to examine the density inversion of natural convection water, i.e. water at 4°C. In the middle of the square, there are circular and elliptical bodies to study fluid–structure interaction in terms of the thermohydraulic behavior and entropy generation. 2D numerical simulation was performed using finite volume method in Ansys fluent software with the assumption of laminar flow. The simulation results are compared with benchmark data to determine reliability. The results indicate that the body insertions increase the convection heat transfer coefficients at the best heat transfer positions due to impingement heat transfer. An increase in heat transfer rate of 1.06 times is observed in the case of circular body compared to none. There are three primary eddies in the cavity with bodies, whereas the cavity without body has two primary eddies. Maximum entropy generation was found in the upper right corner of cavity mainly due to high horizontal temperature gradient. Bodies of circle and vertical ellipse have almost the same thermohydraulic and entropy generation characteristics due to the same horizontal dimension which mainly effects on the downward natural convection current. The entropy generation of cavity with circular body is 1.23 times higher than that of the cavity without body. At positions y/L = 1 on the hot wall and y/L = 0.74 on the cold wall, the convection heat transfer coefficient is close to zero due to stagnant fluid.

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Visualization of heat flow using Bejan’s heatline due to natural convection of water near 4 °C in thick walled porous cavity

Cited by 34 publications

References 20 publications

Visualization of heat flow in a vertical channel with fully developed mixed convection

Visualization of heat flow in a vertical channel with fully developed mixed convection

Visualization and analysis of surface tension and cooling effects on differentially heated cavity using heatline concept

Numerical Investigation of Natural Convection and Entropy Generation of Water near Density Inversion in a Cavity Having Circular and Elliptical Body

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