Abstract
In present study a numerical analysis of complex heat transfer (turbulent natural convection, conduction and surface thermal radiation) in a rectangular enclosure with a heat source has been carried out. The finite volume method based on SIMPLEC algorithm has been utilized. The effects of Rayleigh number in a range from 10<sup>8</sup> to 10<sup>11</sup>, internal surface emissivity 0≤ε˂1 on the fluid flow and heat transfer have been extensively explored. Detailed results including temperature fields, flow profiles, and average Nusselt numbers have been presented. In this investigation it has been tried to study the shape of heat source influence on heat transfer and fluid field in the considered domain. According to results in low emissivity values usage of circular obstacles is recommended. Although in high emissivity values using rectangular obstacles lead to more efficiency.
Highlights
Cooling of electronic devices present in sealed cabins remains a great challenge to electronic and thermal designers as a result of constant miniaturization of these devices and their increased operating temperature level
Martyushev and Sheremet [11, 12] have analyzed numerically natural convection combined with surface thermal radiation in a square [11] and cubical [12] enclosures bounded by solid walls of finite thickness and conductivity with a heat source
To understand the fluid flow and heat transfer in the case of turbulent natural convection combined with surface thermal radiation inside the enclosure, depicted in Figure 1, the following values have been considered: 108
Summary
Cooling of electronic devices present in sealed cabins remains a great challenge to electronic and thermal designers as a result of constant miniaturization of these devices and their increased operating temperature level. Sharma et al [9] studied the interaction of turbulent natural convection and surface thermal radiation in inclined square enclosures. They found that the orientation of the enclosure plays an important effect on the heat transfer characteristics in a cavity. It has been found that regardless of the considered solid-fluid interface the average convective Nusselt number is an increasing function of the Rayleigh number and thermal conductivity ratio, and a decreasing function of the surface emissivity and ratio of solid wall thickness to cavity spacing. While the average radiative Nusselt number increases with the Rayleigh number, surface emissivity and thermal conductivity ratio decrease with ratio of solid wall thickness to cavity spacing
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