An experimental study is performed to investigate and predict the influence of the heating element shape on nucleate pool boiling heat transfer from vertical cylindrical heating elements. An experimental apparatus test is designed and fabricated for this purpose, while water is utilized as the working fluid. Five vertical cylindrical heating elements with different shapes are used. The average heat transfer coefficient is calculated for each case and a shape factor, which includes the heating element geometry, is introduced for each heating element. An empirical correlation is obtained to relate the mean heat transfer coefficient with the heat flux and shape factor. Another correlation is obtained to relate the mean heat transfer coefficient with the saturation temperature difference and the shape factor. A comparative study is performed between the enhancement ratio and both the area ratio and shape factor ratio.

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