Abstract
A procedure has been devised for determining the effective thermophysical properties of bulk materials with different granulometric and material composition, based on the integration of discrete and continuous models of media. The problem on the mechanical-thermal state of a cylindrical layer of bulk material has been stated in order to determine its effective thermophysical properties. Based on the discrete-continuous perceptions of bulk media, an approach has been suggested and a procedure has been devised for solving the problem set. The algorithm for determining effective values of thermophysical properties of bulk materials has been constructed. Numerical implementation of the developed procedure was performed using free open source software (LIGGGHTS, ParaView). The proposed procedure makes it possible to determine effective values for the thermophysical properties of a bulk material (bulk density, effective thermal conductivity coefficient and the effective value for isobaric mass heat capacity) with arbitrary material and granulometric composition. In this case, there is a need for a minimum volume of complex and costly experimental studies with subsequent numerical simulation of the process of the mechanical-thermal state of the examined bulk material. In this case, the true physical properties can be acquired from reference books. Using an example of model material, its effective thermophysical properties have been defined for different granulometric composition and the verification of the developed procedure has been performed. It was established that data on the effective thermal conductivity calculation based on the devised procedure differ from data obtained based on the theoretical averaged dependences, within 0.8‒9.0 %. The reported results are useful for numerical analysis in the continual approximation of thermal modes of the processes and equipment where bulk materials are used
Highlights
Bulk materials, grainy and granulated, have become common in many industries, in the chemical, metallurgical, thermal power, construction, food, electronic.These materials are used as fuel, raw materials, semi-finished goods, and finished products
The aim of this study is to devise a procedure for determining effective values for the thermal properties of bulk materials based on discrete-continuum representations of bulk environment using the true physical properties
We have stated a problem on the mechanical-thermal state of a cylindrical layer of a bulk material to determine its effective thermal-physical properties
Summary
Grainy and granulated, have become common in many industries, in the chemical, metallurgical, thermal power, construction, food, electronic. Development of the effective processes to process bulk materials, as well as to treat them, implies the necessity of data or methods for determining certain properties of these materials, one of the most essential among them are the thermal-physical properties. These properties are of special importance when designing equipment for obtaining and processing of bulk materials, as well as their transportation, dispensing, etc. It is a relevant task to develop new methods for predicting effective thermal-physical properties for bulk materials of various material and granulometric composition in order to minimize volumes of complex and expensive experimental studies
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