EVALUATION OF RADIATION RECEPTION FACTORS IN A ROTARY KILN USING A MODIFIED MONTE-CARLO SCHEME

Application of the Zone method for the calculation of radiative heat transfer in a rotary kiln is hampered by the nonavailability of the direct exchange area data, essential for the use of the Zone method. Monte-Carlo methods provide a rapid and fairly accurate method of calculating the direct exchange areas in an enclosure and the present study demonstrates the use of a nonstochastic Monte-Carlo procedure for the generation of the exchange area data in a rotary kiln system. The model developed is tested for its accuracy using the data available for the axisymmetric cylindrical system. Exchange areas have been calculated using this model for a wide range of kiln radius-absorption coefficient combinations and percent fills of the solid charge. These data, formulated for conciseness as reception factors, facilitate a rapid evaluation of the radiative interchange in rotary kiln enclosures using the Zone method.