Numerical simulation of naturally air cooled electronic equipments casing

Riaz, Ali; Ibrahim, Adnan; Basit, Abdul; Shah, Ajmal; Basit, Muhammad Abdul

doi:10.1109/ibcast.2017.7868100

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Thus, optimum heat source position, inside a naturally cooled enclosure, is close to the inlet and at minimum possible height. Ishizuka and Nakagawa, Riaz et al, and Kazansky et al also observed the same trend. They reported that mean rise in temperature at the vicinity of the heat source decreases as the distance above the heat source increases.…”

Section: Resultsmentioning

confidence: 55%

“…There is nonuniformity in temperature values when the distance between heat source and inlet was increased. Ishizuka and Nakagawa and Riaz et al also reported this nonuniformity and can be explained as below.…”

Section: Resultsmentioning

confidence: 74%

“…The effect of vertical and horizontal alignments of the slots, area of the slots, zonal variation in heat generation, and differential slot opening on cabin cooling is studied. Riaz et al obtained numerical solutions for a naturally cooled electronic equipment enclosure. They studied the effect of outlet height and area on mean rise in temperature inside the enclosure.…”

Section: Introductionmentioning

confidence: 99%

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A three‐dimensional CFD and experimental study to optimize naturally air‐cooled electronic equipment enclosure: Effects of inlet height, heat source position, and buoyancy on mean rise in temperature

Riaz

Basit

Ibrahim

et al. 2017

Asia-Pacific J Chem Eng

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The major reason behind failure of electronic components is the rise in temperature. To optimize design of naturally cooled electronic equipment enclosure, a detailed experimental study and a computational fluid dynamics (CFD) analysis were performed. Commercially available software, ANSYS Fluent, was used for CFD analysis. The three-dimensional form of Navier-Stokes equations was used to solve the problem computationally. Aluminium enclosure having dimensions of 40 cm × 40 cm × 21 cm and thermal conductivity of 210 W/m·K were manufactured for experimentation in this research study.Electronic components were modelled as constant heat flux body during experimentation and CFD analysis. Effect of heat source vertical and horizontal position, inlet height, and buoyancy effect on mean rise in temperature inside the aluminium enclosure was studied. Mean temperature inside the casing was increased by increasing either heat source height or inlet height. At the end, computational results were compared with experimental results in order to check the validity of results. Computational results were highly in accordance with experimental results, because maximum percentage difference between experimental and CFD results was less than 6%. On the basis of results obtained from experiments and simulations, the best configuration of heat source and inlet was proposed, which will provide optimum thermal performance.Numerical results of velocity and temperature inside the enclosure were plotted in the form of streamlines and isotherms. This study can be used as a fundamental step prior to designing electronic equipment enclosure. KEYWORDS computational fluid dynamics (CFD), electronic equipment cooling, heat transfer experimentation, natural convection, three-dimensional analysis, ventilated enclosure Nomenclature: T ∞ , Ambient temperature (K); h, Enthalpy value per unit volume (kJ/kg·m 3 ); g, Gravitational constant (m/s 2 ); Ra, Rayleigh number; c p , Specific heat of fluid (kJ/kg·K); Ρ, Static pressure of air (N/m 2 ); T o , Temperature of the flow (K); u i , Velocity component in the ith direction (m/s); S h , Volumetric heat generation rate (W/m 3 ); K, Wall thermal conductivity (W/m·K); , Greek symbols; β, Coefficient of thermal expansion (1/K); ρ, Density of fluid (kg/m 3 ); μ, Dynamic viscosity of fluid (kg/m·s); α, Thermal diffusivity fluid (m 2 /s); , Subscripts; ∞, Indicating the conditions at infinity; o, Indicating the operating conditions

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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A three‐dimensional CFD and experimental study to optimize naturally air‐cooled electronic equipment enclosure: Effects of inlet height, heat source position, and buoyancy on mean rise in temperature

Riaz

Basit

Ibrahim

et al. 2017

Asia-Pacific J Chem Eng

Self Cite

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“…Ali Riaz et al studied effect of heat source height inside the ventilated enclosure on mean rise in temperature numerically. This study suggested that heat source should be at minimum height relative to the base of enclosure or at maximum height relative to the outlet position of the enclosure to achieve maximum cooling [2,3] . Basavaraj Kusammanavar et al numerically studied the effect of heat source position on natural convection in a square cavity.…”

Section: Introductionmentioning

confidence: 99%

Convection Heat Transfer from Heated Thin Cylinders Inside a Ventilated Enclosure

Riaz

Ibrahim

Bashir

et al. 2022

semicond. sci. and inf. n.a.

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Experimental study was conducted to determine the effect of velocity of axial fan, outlet vent height, position, area, and aspect ratio (h/w) of ventilated enclosure on convection heat transfer. Rectangular wooden ventilated enclosure having top and front transparent wall was made up of Perspex for visualization, and internal physical dimensions of box were 200 mm × 200 mm × 400 mm. Inlet vent was at bottom while outlet vents were at the side and top wall. Electrically heated cylindrical heat source having 6.1 slenderness ratio was fabricated and hanged at the centre of the enclosure. To calculate heat transfer rates, thermocouples were attached to the inner surface of heat source with silica gel. Heat source was operated at constant heat flux in order to quantify the effect of velocity of air on heat transfer. It was observed that average Nusselt number was increased from 68 to 216 by changing velocity from 0 to 3.34 m/s at constant modified Grashof number i.e. 5.67E+09. While variation in outlet height at the front wall did not affect heat transfer in forced convection region. However, Nusselt number decreased to 5% by changing the outlet position from top to the front wall or by 50% reduction in outlet area during forced convection. Mean rise in temperature of enclosure increased from 8.19 K to 9.40 K by increasing aspect ratio of enclosure from 1.5 to 2 by operating heat source at constant heat flux i.e. 541.20 w/m2.

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Experimental Study of Laminar Natural Convection Heat Transfer from Slender Circular Cylinder in Air Quiescent Medium

Riaz

Shah

Basit

et al. 2019

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)

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Numerical simulation of naturally air cooled electronic equipments casing

Cited by 3 publications

References 6 publications

A three‐dimensional CFD and experimental study to optimize naturally air‐cooled electronic equipment enclosure: Effects of inlet height, heat source position, and buoyancy on mean rise in temperature

A three‐dimensional CFD and experimental study to optimize naturally air‐cooled electronic equipment enclosure: Effects of inlet height, heat source position, and buoyancy on mean rise in temperature

Convection Heat Transfer from Heated Thin Cylinders Inside a Ventilated Enclosure

Experimental Study of Laminar Natural Convection Heat Transfer from Slender Circular Cylinder in Air Quiescent Medium

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