Numerical Study of Convective Heat Transfer for Different Shapesof Hot Sources Inside an Enclosure

[摘要] In this paper, natural convection around a square and triangle bar kept in a square enclosure has been studied. Aim of this research has analysis, the heat transfer based on natural convection by using air as a medium. The problems taken for study were a varying square enclosure with different aspect ratio of sources of both square and triangle bar. Numerical simulations and boundary conditions are carried out for analysis these systems by using Fluent Software. The square and triangle bar are considered as a hot source and the square enclosure of vertical walls are cold surfaces and horizontal walls are insulated. The size of the square enclosure are taken 20 mm, 40 mm and 80 mm corresponding to each enclosure were taken as the aspect ratio of both square and triangle bar of 0.2, 0.3 and 0.4 respectively. The heat transfer results are obtained from simulation with the help of temperature distribution, Nusselt Number and flow stream function. From this analysis the heat transfer rate was compared each other and concludes that the higher heat transfer rate in square source than triangle source varying enclosures and different aspect ratio.

[关键词] Natural convection;Numerical simulation;Comparison.