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Numerical investigation on forced convection heat transfer over a rotating circular cylinder inside a confined channel

The present study demonstrates a numerical investigation of forced convection heat transfer over a rotating hot circular cylinder vertically placed at the central axis of a confined horizontal channel. Fully developed laminar flow of air at ambient temperature is considered at the channel inlet, whe...

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Bibliographic Details
Main Authors: Hossain, Md. Rakib, Saha, Sumon, Mamun, Mohammad
Format: Conference Proceeding
Language:English
Subjects:
Online Access:Get full text
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Summary:The present study demonstrates a numerical investigation of forced convection heat transfer over a rotating hot circular cylinder vertically placed at the central axis of a confined horizontal channel. Fully developed laminar flow of air at ambient temperature is considered at the channel inlet, whereas the surface of the channel is kept insulated. The cylinder is rotating either clockwise or counter-clockwise direction with a constant angular speed. The governing mass, momentum and energy equations in non-dimensional form are solved numerically using Galerkin finite element method. Parametric simulation is carried out over a range of mean flow Reynolds number based on the mean velocity of the working fluid within the range of 40 ≤ Re ≤ 2000. The variation of blockage ratio is considered as β = 0.05, 0.1 and 0.2 respectively. Moreover, the rotational Reynolds number of the cylinder based on the peripheral velocity of the cylinder is set at Rec = 4, 10, 20 and 30 respectively. The numerical results are visualized in terms of streamline plots and isosurface plots of thermal field. The distributions of coefficient of drag, coefficient of lift and average Nusselt number of the hot cylinder surface as a function of Reynolds number reveal a number of interesting observations from the present findings. It can be concluded that the changes of Re and β significantly affect both on the aerodynamic and the thermal performance of the confined channel.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0037673