Theoretical Basis Of Cascade Dryer Aerodynamics And Evaluation Of Variable Parameters

Abstract

This article discusses the theoretical foundations of the aerodynamics of a cascade dryer used in the industrial drying of wheat grain and the physical and mathematical models of the heat and mass transfer processes occurring in it. The efficiency of the dryer is evaluated depending on the air flow rate, temperature, partial pressure, and moisture properties of the grain being dried. The study analyzed the effects of parameters such as the drying agent motion mode, resistance coefficients in the grain layer, mass transfer coefficient hm, and evaporation coefficient φs. Also, the relationships between the saturation pressure of water vapor on the grain surface psat(Ts), air humidity Yxavo, and air density ρn.u were developed. The results obtained serve to determine the optimal technological modes that allow for energy-efficient drying of wheat while maintaining quality indicators.