Nusselt number correlations for heat transfer analysis around a tube at subcritical Reynolds numbers
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Abstract
Nusselt number around circular tube has been typically correlated by the power law: Nu= C Rem Prn. In the present study, a numerical technique of Matrix least-squares has been utilized to estimate coefficient and power indices of the typical power law through a MATLAB program using experimental data of local Nusselt Number around the tube surface for subcritical range of Reynolds Number in cross flow condition. Correlations of average Nusselt number have been developed for different flow regimes i.e. before and after boundary layer separation, front and rear portions around the tube surface including front and rear stagnation points. Utilizing before and after boundary layer separation developed correlations, a correlation has been proposed for the estimation of overall average Nusselt Number around the tube surface. The developed correlations were compared with the benchmark data of reported literatures and obtained a reasonably good agreement with them.
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