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

Riaz, Ali; Shah, Ajmal; Basit, Abdul; Iqbal, Mazhar

doi:10.1109/ibcast.2019.8667230

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…In mixed convection region, Nusselt number was varied from 120 to 160, but in forced convection there was a sharp increment in heat transfer and Nusselt number reached upto 216; while in natural convection region, Nusselt number suddenly decreased to 68. Trend of region "A" of Figure 7 was also observed in reference [16] .…”

Section: Effect Of Inlet Velocitysupporting

confidence: 70%

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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Section: Effect Of Inlet Velocitysupporting

confidence: 70%

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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“…Al-Arabi and Khamis [10] published empirical correlation for isothermal cylinder surrounded by air to approximate average Nusselt number in laminar and turbulent region. Ali Riaz et al [11] experimentally determined local variation of heat transfer coefficient across the length of cylinder placed in infinite air medium.…”

Section: Vertical Positionmentioning

confidence: 99%

Experimentation on Optimal Configuration and Size of Thin Cylinders in Natural Convection

Riaz

Ibrahim

Bashir

et al. 2022

semicond. sci. and inf. n.a.

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In this paper, an experimental study of laminar, steady state natural convection heat transfer from heated thin cylinders in an infinite air medium has been reported. Two electrically heated cylinders having the same slenderness ratio (L/D) i.e. 6.1 but different diameters i.e. 3.8 cm and 5.08 cm were used. 105 experiments were carried out to study the effect of diameter and inclination angle of thin cylinder on natural convection heat transfer. After mandatory corrections of radiation and endcap heat losses, convective heat transfer results were presented in the form of local and average dimensionless numbers. For vertical configuration of thin cylinder, Nusselt number was varied from 52.99 to 95.10 corresponding to 1.28×108≤Ra*L≤1.08×1010. While for horizontal configuration,Nusselt number was varied from 10.74 to 17.78 corresponding to 9.42×104≤Ra*D≤8.17×106. Results were compared with the published data and found satisfactory as the maximum percentage difference was only 3.09%. The essence of research is that the heat transfer coefficient increases with decrease in diameter and increase in inclination angle. Smoke flow visualization was done to capture patterns of fluid flow. Finally, comparison was made to quantify increase in Nusselt number from slender cylinder as compared to the flat plate.

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

Cited by 2 publications

References 20 publications

Convection Heat Transfer from Heated Thin Cylinders Inside a Ventilated Enclosure

Convection Heat Transfer from Heated Thin Cylinders Inside a Ventilated Enclosure

Experimentation on Optimal Configuration and Size of Thin Cylinders in Natural Convection

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