Thermal characteristics in asymmetrically heated channels fully filled with brass beads

Jeng, Tzer‐Ming; Tzeng, Sheng‐Chung; Chen, Yi‐Chen

doi:10.1016/j.ijthermalsci.2011.05.011

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…. It is shown good agreement between two works with a percentage difference ratio (6.19 % ) as shown in Table(5) .…”

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confidence: 58%

“…Because of the random structures of porous media , they are different in geometry , the authors in Ref. [ 3 , 4 ] used metallic wire mesh to enhance heat transfer and Jengetal [ 5 ] used another porous materials which packed by brass beads with average diameter of ( 2 , 4 and 6 mm ) . They filled spherical packing in the asymmetrically heated rectangular channels.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on Heat Transfer Enhancement for Porous Heat Exchange in Rectangular Duct

Hilal¹,

Saleh²,

Ebraheem³

2014

ETJ

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Forced convection heat transfer of air in porous rectangular duct was investigated experimentally . The pad consist of (zig-zag ) metallic wire mesh insert with two different porosities ( 𝜀𝜀) namely ( 0.97 ) and ( 0.99) .The experiments were carried out for Reynolds number (7682,12497 and 17323 ) and constant heat flux (192,297 and 422 W/mP 2 P ) .The results indicated that Nusselt number was increased with increasing Reynolds number and heat flux but decreased with increasing pad porosity .The Nusselt number in the porous duct was increased up to (144% ) for (𝜀𝜀 = 0.97) and (72% ) for (𝜀𝜀 = 0.99) when compared to clear duct at the same tested condition . For optimization between heat transfer enhancement and pad weight added into clear duct , it is found that [ (NuR porous R -NuR clear R ) / weight of pad ] equal to (84.34 ) and ( 40.49 ) for (𝜀𝜀 = 0.99 and 𝜀𝜀 = 0.97) respectively and this is good improvement in heat transfer through porous rectangular duct and reducing size and weight of original duct .

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“…. It is shown good agreement between two works with a percentage difference ratio (6.19 % ) as shown in Table(5) .…”

supporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Heat Transfer Enhancement for Porous Heat Exchange in Rectangular Duct

Hilal¹,

Saleh²,

Ebraheem³

2014

ETJ

View full text Add to dashboard Cite

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“…al. [3] investigated experimental characteristics of heat transfer in rectangular channel filled with solid particles. Air was utilized as the working fluid and brass beads as porous media.…”

Section: Introductionmentioning

confidence: 99%

The Porosity Effect of Stainless Steel Balls on Forced Convection Pipe Flow

Flayh

Ghashim

2019

NJES

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An experimental study has been carried out to investigate the effects of stainless-steel balls on forced convection flow in pipe under uniform heat flux. Water is used as the working fluid and stainless-steel balls as a porous media. The Reynolds number range from (5000 to 9000) based on the diameter of the pipe. The experiments were conducted on three various numbers of stainless-steel balls (N) with various diameters (dp), which give various porosity (0.33, 0.38 and 0.41). These are (N= 2400, dp=1mm), (N=1600, dp=3mm) and (N= 750, dp=5mm). Results show that, heat transfer coefficient increases with the decrease in the porosity due to the reduction in the space between balls. This led to an increase in turbulence and produced eddies. Furthermore, enhancement in heat transfer coefficient reached its maximum value of (45%) for ball diameter with (dp=1mm) and water flow rate (9 L/min). New Correlation equations for the average heat transfer coefficient were obtained for three different diameters of balls (1, 3 and 5 mm).

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Forced Convection

Nield¹,

Bejan²

2017

Convection in Porous Media

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Thermal characteristics in asymmetrically heated channels fully filled with brass beads

Cited by 11 publications

References 18 publications

An Experimental Study on Heat Transfer Enhancement for Porous Heat Exchange in Rectangular Duct

An Experimental Study on Heat Transfer Enhancement for Porous Heat Exchange in Rectangular Duct

The Porosity Effect of Stainless Steel Balls on Forced Convection Pipe Flow

Forced Convection

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