Comparative study between step and sinusoidal temperature profiles during natural convection inside a square enclosure heated from bottom
Tóm tắt
The core goal of the current theoretical exertion is to explore the impacts of step and sinusoidal bottom heating patterns on the buoyancy-driven flow and their heat flow aspects that are triggered by the temperature gradient inside the cavity which is commonly essential for many engineering applications like solar cells, food processing unit, materials processing unit, nuclear reactor core, etc. The domain of study is an air-filled cavity with an aspect ratio of 1, while the bottom wall is subjected to these two types of boundary conditions. The vertical walls are retained at reasonably lower temperatures whereas the top wall is kept insulated. The thermal and flow properties have been perceived with the aid of pertinent parameters like entropy generation, Nusselt number, non-dimensional temperature profiles and stream functions. The Ra is varied in the range of 103 ≤ Ra ≤ 106. The SIMPLE algorithm is applied to solve the governing differential equations by using a commercial software Ansys Fluent 2019. A significant observation found from the work is that the heat transfer rate is greater in the case of the step temperature profile. The average Nusselt number enhances 1.7 times from Ra = 105 to Ra = 105 for both the heating cases. Additionally, the heat transfer irreversibility is more near the wall as related to far from the wall due to high temperature gradients. The total entropy generation is 1.4 times more for step temperature profile as related to sinusoidal heating.
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