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Experimental and Theoretical Investigation of Heat Transfer by Electrically Heated Square or Rectangular Surfaces

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Abstract: An experimental work was done to determine the heat transfer from an electrically heated square rectangular surface. The surrounding medium air is considered & the transfer of heat takes place by means of natural or free convection process. The free convection air flows as a result of temperature difference, which causes a density variation & this density variation introduces a buoyant force which results in fluid flow near the surface. Experiment was done on a flat plate kept at temperature of 348 K to 366 K. The experiment was carried out in an A.C. room so that the surrounding air temperature is kept constant within the limit 293 K to 297 K. The rectangular flat plate with its heated surface facing upwards moved through different angular positions. The experimental values of the temperature were recorded at various distances. In vertical position, the data obtained agrees well with earlier experimental work. The experiment shows that the temperature distribution is not affected with the increase in distance from the leading edge of the plate for horizontal position. Effect of different angular position of plate on heat transfer was evaluated.

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