Numerical and Experimental Studies of Mixed Convective Heat Transfer from Vertical, Horizontal, and Inclined Narrow Rectangular Flat Plates
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Authors
Elkhmri, Mohamed M Rajab
Date
2024-10-29
Type
thesis
Language
eng
Keyword
Mixed , Heat , Convective
Alternative Title
Abstract
Numerical and experimental studies have been undertaken on the mixed convective heat transfer from two-sided rectangular flat plates that are either horizontal, vertical, or inclined in the laminar flow region. The width of the plate is relatively small compared to its length, i.e., the plate is narrow. The hot plates under consideration had air exposure. The 3 dimensional steady state governing equations subject to different parameters have been solved numerically using the commercial CFD solver. In experimental study, the lumped capacitance approach was used to determine the heat transfer rate. The present numerical results have been verified by carrying out some experimental results.
The research on mixed convective heat transfer from heated plates revealed that plate widths and thickness and thermal boundary conditions had only a minor influence on the heat transfer rate from the bottom, top, and side surfaces of the plates. The fluid properties are constant except for the density change with temperature which gives rise to the buoyancy forces, this having been treated using the Boussinesq approach. Results were only obtained for a Prandtl number of 0.7; this being approximately the value of air. The inclination angle has a variation influence on the heat transfer rate from the top surface of the plate and from the bottom surface. While the heat transfer is similar in the vertical plates from both sides.
During the experimental investigations, the average heat transfer rates from rectangular plates were determined by the transient method. This method involved heating the plate and then measuring its temperature-time variation as it undergoes cooling. The determination of average heat transfer rates from the flat plates using a steady-state method, primarily consisting of heating the plate in an electrical furnace. All experiments were conducted within a large enclosure.