Experimental Estimation of Heat Transfer Coefficients Using Helical Coil in an Agitated Vessel

A mathematical model is developed to analyze the heating rates and compare the relation with experimental results obtained in our present study . Low shear rate concentration of sodium carboxymethal cellulose fluids with two different coil lengths 2.362m and 2.82m, diameter of the helical coil equal to 156mm, di=4.0mm and do=6.4mm were used to correlate overall heat transfer coefficients in an agitated vessel with four blade paddle impeller. The model is derived by using velocity flow field and energy equations in cylindrical coordinate for straight tube and later extended to helical coil. The new design relation for obtaining the individual heat transfer coefficient in terms of flow behavior index is equal to