Two-dimensional analysis of low-pressure flows in an inclined square cavity with two fins attached to the hot wall

Al‐Kouz, Wael; Alshare, Aiman; Kiwan, Suhil; Almuhtady, Ahmad; Alkhalidi, Ammar; Saadeh, Haneen

doi:10.1016/j.ijthermalsci.2018.01.005

Cited by 35 publications

(12 citation statements)

References 12 publications

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“…It was shown that dispersing nanosolid particles enhances the heat transfer but with a pressure drop penalty. Their results were compared to Al-Kouz et al [78] to show the enhancement in heat transfer compared to rarefied flows with no dispersed solid particles. Moreover, Al-Kouz et al [79] studied the entropy generation inside cavities equipped with solid fins and filled with air/Al 2 O 3 nanofluid.…”

Section: Thermal Applications Of Hybrid Nanofluidsmentioning

confidence: 97%

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Hussien¹,

Al‐Kouz²,

Yusop³

et al. 2019

SV-JME

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Section: Thermal Applications Of Hybrid Nanofluidsmentioning

confidence: 97%

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Hussien¹,

Al‐Kouz²,

Yusop³

et al. 2019

SV-JME

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“…They determined that there is an optimum position of the fins to achieve the maximum heat transfer. In their work, Al-Kouz et al [6] numerically investigated low-pressure flow and heat transfer characteristics in an inclined enclosed cavity in which the hot wall is attached to two fins, the effects of the Knudsen number, the Rayleigh number, porosity of the fins, location of the fins, length of the fins, tilt angle and the conductivity ratio are presented. In addition, a correlation of the Nusselt number among these parameters is proposed.…”

Section: • the Cavity Was Filled With Air-al 2 O 3 Nanofluid • The Ementioning

confidence: 99%

“…In Fig. 12, variations of the Nusselt number with the solid nanoparticles volume fraction (ϕ) for different values of the Knudsen number and Ra = 10 6 are plotted. The graph shows that as ϕ increases the Nusselt number increases for all values of the Knudsen number.…”

Section: Code Verificationmentioning

confidence: 99%

“…Variation of the vertical velocity (V y ) with the length of the cavity (L) for different Knudsen numbers, Ra = 10 demonstrates the temperature variations along the centreline of the cavity at Ra = 106 and different values of Knudsen numbers that cover the continuum and slip flow regimes. The graph shows that as the Knudsen number increases, the temperature jump at the hot wall increases.…”

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confidence: 99%

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Numerical Study of Heat Transfer Enhancement for Low-Pressure Flows in a Square Cavity with Two Fins Attached to the Hot Wall Using Al2O3-Air Nanofluid

Al‐Kouz

Kiwan

Alkhalidi

et al. 2018

SV-JME

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The gaseous low-pressure nanofluid flow of a steady-state two-dimensional laminar natural convection heat transfer in a square cavity of length L with two attached solid fins to the hot wall is numerically investigated. Such flows are found in many engineering applications, such as nuclear reactors and electronic cooling equipment. Physical parameter ranges in this study are as follows: 0 ≤ Kn ≤ 0.1, 10 3 ≤ Ra ≤10 6 , 0 ≤ ϕ ≤ 0.2, L F /L takes the value of 0.5, H F takes the values of 0.25 to 0.75. Simulation results show that Nusselt number depends directly on the Rayleigh number and inversely on the Knudsen number. In addition, it is found that heat transfer will be enhanced by dispersing the nanoparticles of Al 2 O 3 in the base low-pressure gaseous flow. Moreover, it is found that the Nusselt number of such flows increases as the nano-particle volume fraction increases for the investigated range of volume fractions considered in this study. In addition, a correlation of the Nusselt number among all the investigated parameters in this study is proposed as Nu = 0.2196 Ra 0.0829 Kn-0.511 ϕ 0.104 .

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“…He found that the heat transfer rate is enhanced and entropy generation is dropped when both ϕ and Ra are increased. Al-Kouz et al [17] numerically investigated free convection heat transfer characteristics of rarefied flows in an inclined square enclosure equipped with two solid or porous fins at the hot wall. They found that with equipped fins to the hot wall, the heat transfer rate is enhanced.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Optimization for Rarified Nanofluid Flows in a Square Cavity with Two Fins at the Hot Wall

Al‐Kouz

Almuhtady

Owhaib

et al. 2019

Preprint

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Computational Fluid Dynamics (CFD) is utilized to study entropy generation for the rarefied steady state laminar 2-D flow of air-Al2O3 nanofluid in square cavity equipped with two solid fins at the hot wall. Such flows are of great importance in industrial applications, such cooling of the electronic equipment’s and nuclear reactors. In the current study, effects of Knudsen number (Kn), Rayleigh number (Ra) and the nano solid particles volume fraction (ϕ) on the entropy generation are investigated. The values of parameters considered in this work are as follows: 0≤Kn≤0.1, 〖10〗^3≤Ra≤〖10〗^6,0≤ϕ≤0.2. Length of the fins (LF) is considered to be fixed and equals to 0.5 m, whereas the location of the fins with respect to the lower wall (HF) is set to 0.25 and 0.75 m. Simulations demonstrate that there is an inverse direct effect of Kn on the entropy generation. Moreover, it is found that when Ra is less than 104, the entropy generation, due to the flow, increases as ϕ increases. In addition, the entropy generation due to the flow will decrease at Ra greater than 104 as ϕ increases. Moreover, the entropy generation due to heat will increase as both the ϕ and Ra increase. In addition, a correlation model of the total entropy generation as a function of all of the investigated parameters in this study is proposed. Finally, an optimization technique is adapted to find out the conditions at which the total entropy generation is minimized

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Two-dimensional analysis of low-pressure flows in an inclined square cavity with two fins attached to the hot wall

Cited by 35 publications

References 12 publications

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Numerical Study of Heat Transfer Enhancement for Low-Pressure Flows in a Square Cavity with Two Fins Attached to the Hot Wall Using Al2O3-Air Nanofluid

Entropy Generation Optimization for Rarified Nanofluid Flows in a Square Cavity with Two Fins at the Hot Wall

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