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NUMERICAL ANALYSIS OF THE HEAT TRANSFER IN THE WALL OF ROTARY KILN USING FINITE ELEMENT METHOD ANSYS

Heat transfer mechanism is complicated in case of rotary kiln as it includes conduction, convection and radiation at a same time. It is necessary to solve the governing heat transfer model numerically due to multi-dimensional nature of the model which takes in to account the thermal heat conduction in radial and circumferential direction. In order to predict and improve the evolution and the distribution of temperatures in the rotary furnace, a numerical analysis is undertaken using finite element package ANSYS. The standard element type plane 55 for two dimensional thermal solids is used. A numerical simulation includes temperature distribution on the internal surface of the wall in order to improve the understanding of the heat transfer process across it. Analysis of the temperature distribution across the circumferential and radial direction and the causes of temperature fluctuation due to the boundary conditions were studied thoroughly. There is a clear temperature distribution across the wall of the rotary kiln for various angular velocities, with different heat transfer coefficients and under different filling degree. Penetration depth, which is the region till where all curves meet together, has been easily observed on the radial side of the wall. Only this thickness takes part in heat transfer process. Penetration depth increases with increase in the filling degree. Temperature at the solid side decreases continuously and at the gas side it first increases because of the regenerative heat phenomenon. Experimental results are qualitatively matching with the numerical results. Temperature fluctuations increase with increase in rotational speed has also been observed. NOMENCLATURE