Visualization of natural convection heat transport using heatline method in porous non-isothermally heated triangular cavity

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

doi:10.1016/j.ijheatmasstransfer.2008.04.023

Cited by 81 publications

(20 citation statements)

References 30 publications

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“…(17) The boundary conditions for dimensionless heatfunction equation (20) are obtained from the integration of Eq. (18) along the considered boundary.…”

Section: Heat Functionmentioning

confidence: 99%

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A heatline analysis of natural convection in a square inclined enclosure filled with a CuO nanofluid under non-uniform wall heating condition

Öztop¹,

Mobedi²,

Abu‐Nada³

et al. 2012

International Journal of Heat and Mass Transfer

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a b s t r a c tHeatline visualization technique is used to understand heat transport path in an inclined non-uniformly heated enclosure filled with water based CuO nanofluid. The cavity has square cross-section and it is nonuniformly heated from a wall and cooled from opposite wall while other walls are adiabatic. The governing equations which are continuity, momentum and energy equations are solved using finite volume method. The dimensionless heatfunction for nanofluid heat flow is defined and solved to determine heatline patterns. Calculations were performed for Rayleigh numbers of 10 3 , 10 4 and 10 5, inclination angle of 0°, 30°, 60°and 90°, and nanoparticle fraction of 0, 0.02, 0.04, 0.06, 0.08 and 0.1. It is observed that heat transfer in the cavity increases by adding nanoparticles. The rate of increase is greater for the enclosures with low Rayleigh number. Visualization of heatline is successfully applied to nanoparticle convective flows. Based on the heatline patterns, three heat transfer regions are observed and discussed in details.

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“…(17) The boundary conditions for dimensionless heatfunction equation (20) are obtained from the integration of Eq. (18) along the considered boundary.…”

Section: Heat Functionmentioning

confidence: 99%

“…In their geometry, a thermal barrier was used in the ceiling wall. Varol et al [20] made a numerical work to visualize heat transfer in a non-isothermally heated triangular cavity filled with porous media. They observed that the nonisothermal wall changes the heat transport way.…”

Section: Introductionmentioning

confidence: 99%

A heatline analysis of natural convection in a square inclined enclosure filled with a CuO nanofluid under non-uniform wall heating condition

Öztop¹,

Mobedi²,

Abu‐Nada³

et al. 2012

International Journal of Heat and Mass Transfer

Self Cite

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“…Heat transfer analysis in triangular enclosures heating from side or below are substantially employed in various domestics and industrial applications [8][9][10][11]. Varol et al [12] have numerically investigated the natural convection in triangular enclosure with heater. It was reported that the aspect ratio and height of the heater shall be higher and heater must be placed at the center of the bottom wall for high heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of natural convection in a triangular cavity with different configurations of hot wall

Triveni¹,

Panua²

2017

IJHT

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This computational work is exploited in an isosceles right triangular cavity to delineate the effect of different shapes of base hot wall i.e. smooth, triangular zig-zag (TZ) and caterpillar shape (CS) on natural convection cooling. The side and inclined wall of the enclosure is presumed as cold walls. The two dimensional mass, momentum and energy equations are solved by finite volume method based on SIMPLE algorithm. The results are drawn for different types of hot wall with varying aspect ratio (σ) and Rayleigh number (10 5 -10 7 ). From the investigation, it is found that the heat transfer rate is increased for both triangular zig-zag and caterpillar curve shape walls and with the increase of their aspect ratios but the maximum rate of heat transfer is obtained for caterpillar shape.

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“…Varol et al [7] studied numerical analysis of natural convection for a porous enclosure with sinusoidally temperature profile on the bottom wall. Varol et al [8] considered natural convection heat transport using heatline method in porous non-isothermally heated triangular cavity. Khansila and Witayangkurn [9] studied the visualization of natural convection in porous enclosure by sinusoidally temperature on the one side.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Natural Convection in Porous Square Enclosure Non-Uniformly Heated From the Partitions

Khansila¹,

Witayangkurn²

2014

Int. J. of Pure and Appl. Math.

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Numerical study has been performed to investigate the effects of location and height for the partitions located on the bottom wall of a square enclosure filled with porous media. This study starts considering the simplest enclosure with two partitions. The partitions are non-uniformly heated. The left and the top wall are cooled while the right and the bottom wall are adiabatic well. The location and height of two partitions are considered. The interested parameters are Darcy number (Da) from 10 −5 to 10 −1 , the value of Rayleigh number(Ra) is fixed at 10 5 and the Prandtl number (P r) is 0.71. The results are presented in forms of streamlines, isotherms and heatlines. It can be found that the flow field is single cell when the height of the partitions is less than 0.5. The flow field and heat transfer increase when the value of Darcy number is increased.

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Visualization of natural convection heat transport using heatline method in porous non-isothermally heated triangular cavity

Cited by 81 publications

References 30 publications

A heatline analysis of natural convection in a square inclined enclosure filled with a CuO nanofluid under non-uniform wall heating condition

A heatline analysis of natural convection in a square inclined enclosure filled with a CuO nanofluid under non-uniform wall heating condition

Numerical analysis of natural convection in a triangular cavity with different configurations of hot wall

Numerical Study of Natural Convection in Porous Square Enclosure Non-Uniformly Heated From the Partitions

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