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A Simplified Correlation for the Prediction of Nucleate Pool Boiling Performance of Single Integral Enhanced Tubes Boiling Pure Liquids at Atmospheric Pressure | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 11, Issue 3, 2007, Pages 131-148 | ||
| Author | ||
| Ali Hussain Tarrad | ||
| Abstract | ||
| This investigation is concerned with the prediction art of the nucleate boiling heat transfer coefficient obtained from boiling on enhanced surfaces. It is devoted to study the enhancement factor of single enhanced tubes boiling pure liquids at atmospheric pressure which in turn reflects the boiling performance of the heating element during the process. Two surfaces of the integral machined structure; Gewa-T and Low Finned, tubes were considered. A new correlation for the estimation of the heat transfer coefficient in the nucleate region was developed for these tubes. This equation was formulated by a dimensional analysis based on the Buckingham (π) theorem to handle the various variables considered to describe the mutual effect of the surface and liquid on the enhancement factor of a given surface structure. It is obvious that the enhancement factor is a strong function of the fin shape of the enhanced surface structure and boiling liquids physical properties. Six liquids boiling at atmospheric pressure were used, R-113, n-pentane, ethanol, water, p-xylene and R-11, for a heat flux in the range between (10) and (50) kW/m2. The present correlation showed a good agreement with the available experimental data of the nucleate pool boiling heat transfer coefficient from the literature with a total absolute mean errors of (8%) and (9%) for the low finned and Gewa-T surfaces respectively | ||
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