Development of a theory and methods for calculating the heat and mass transfer in drying a porous body with multicomponent vapor and liquid phases

Theoretical Basis of Continuous Drying of Dispersed Materials

“…When constructing a mathematical model of the dynamics of drying a dispersed layer, it was assumed that the liquid phase moves only in the particle capillaries, while vaporous moisture moves along the particle capillaries and in the space between them. The system of equations was built on the basis the differential equation of substance transfer W (energy, mass, momentum) [1]…”

“…where Ufl, Uvvolume concentrations of liquid and steam; λеf = λbb + λflfl + (λv + λai)g; сеf=сbρb(1-П)(1-εla)+сflUfl+сvUv+сaiaigeffective thermal conductivity and heat capacity of the dispersed layer; where, the volume fractions of the body b=(1-П)(1-εla), liquid fl = Ufl/fl and gas g=1-b-fl in the dispersed layer, Пmaterial porosity; εlalayer porosity; Lis the heat of vaporization; еhe relative volume deformation εV is based on the differential equation of the thermal-concentration deformation [1]. The diffusion coefficients of the liquid and gas phases is determined by the formulas:…”

“…The method of mathematical modeling makes it possible to solve these problems. In [1], for the first time, a mathematical model was built and a numerical method was developed for calculating the dynamics of heat and mass transfer and phase transformations during the dehydration of consolidated capillary-porous materials in continuous convective dryers. In [2], shrinkage was taken into account during continuous drying of colloidal capillary-porous materials.…”

Динаміка Процесів Сушіння Рослинної Сировини В Періоді Спадаючої Швидкості

“…Визначено вміст вільної та зв'язаної вологи в залежності від початкової вологості матеріалів. В роботі [9] У роботі [15] наведений чисельний метод розрахунку динаміки рідини в каналі з проникними стінками. В роботі [16] наведений чисельний метод розрахунку тепломасоперенесення, в роботі [17] наведена фізична модель динаміки рідини в порах та розрахунок фазових перетворень під час сушіння пористих середовищ з паровою та рідкою фазами.…”

Theoretical rationale and identification of heat and mass transfer processes in vibration dryers with IR-energy supply

“…Therefore, the engineering calculation of the kinetics of heating and dehydration of moist dispersed materials is based on approximate methods developed with approximate assumptions for specific systems, with taking into account the hydrodynamic state in the apparatus [8,9]. Thus, studies [10,11], in particular, use the balance equations for heat and mass transfer to research the kinetics of heating in the drying of grain material under constant or periodic infrared energy supply.…”