JP Journal of Heat and Mass Transfer
Volume 14, Issue 2, Pages 187 - 199
(May 2017) http://dx.doi.org/10.17654/HM014020187 |
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ANALYSIS OF NATURAL CONVECTION OF AIR IN TRIANGULAR ENCLOSURES OF DIFFERENT INCLINATION ANGLES
K. B. Sahu, Manas Kumar Puthal and Natabar Mohapatra
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Abstract: In this paper, a numerical investigation has been conducted in triangular enclosures with air inside it to study the effect of enclosure size, aspect ratio of the enclosure (height of the enclosure for a given base length) on the flow, temperature distribution and heat transfer characteristics. The triangular enclosures are isosceles in nature, the two inclined walls are considered to be at higher temperature and the base at lower temperature. The governing equations are solved using the commercial software package ANSYS Fluent. Assuming constant properties of air, the Rayleigh number depends on the size of the enclosure for fixed high and low temperatures. The Rayleigh number is varied from to The flow and temperature distribution also depends on the aspect ratio of the enclosure. Keeping base length fixed, the increase in the aspect ratio implies more height of the enclosure. Aspect ratios in the range from 0.5 to 1.5 are taken. Results are presented in the form of contours of isotherm and stream function. The heat transfer at the walls and the flow inside the enclosure are analyzed. The motion of fluid is almost uniform and the temperature gradient is more for lower Rayleigh numbers. For enclosures with lower aspect ratios, the motion is almost uniform and temperature gradient is more at the active walls. Heat transfer rate from hot wall to cold wall is more for higher Rayleigh numbers and lower aspect ratios. |
Keywords and phrases: triangular enclosure, aspect ratio, inclination angles, ANSYS Fluent. |
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