Thermohydrodynamic Processes in Spray Drying with Convective–Radiation Energy Supply

Akulich, P. V.; Slizhuk, D. S.

doi:10.1134/s0040579521010024

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The models differ in the number of equations simulating the temperature state of the material and moisture transfer, as well as in the method of determination of the intensity function of phase transformations of liquid and vapor at the internal points of the porous body. The most common methods use the phase transition coefficient [12][13][14][15] or the mass transfer equation of the liquid phase [17][18][19][20][21][22][23][24][25], which require the moisture content function, the correct determination of which, without knowing the intensity of the phase transition, is somewhat problematic.…”

Section: Discussionmentioning

confidence: 99%

“…. By analogy with a fluidized bed, for which the hydrodynamic characteristics are the porosity of the fixed bed and that of the suspended bed [13], the speed of the material and components ψ (ψ = fl, v, ai) of the bound substance in regard to the vat body in the mathematical model depends on the correlation between the change in the dispersed layer thickness, mixers' speed rate [2], and the particular value of layer porosity ε la .…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In physical terms, these processes can proceed almost independently, so this method presents the replacement of one required function with another one. To define the phase transition coefficient, it is necessary to conduct experimental studies, though it has been already determined for a number of materials [13]. In [14], a mathematical model of heat and mass transfer in dispersed plant material in the process of drying and heating by an ultra-high-frequency electromagnetic field is presented.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Heat and Mass Transfer during Moisture–Heat Treatment of Castor Beans to Improve the Quality of Vegetable Oil

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An important process in the technology of plant oil production by mechanical pressing is the wet–heat treatment of crushed oilseeds, in which the oilseed (compressed seed) is exposed to saturated vapor and a conductive heat supply. Optimal mode selection of wet–heat treatment based on a detailed study of the physical processes taking place in the compressed seed increases oil release, improves its quality indicators, and decreases energy consumption. Mathematical modeling is an advanced method for studying the dynamics of humidification and frying in the compressed seed. The article introduces a mathematical model and a numerical method for calculating heat-and-mass transformation and phase conversion in the process of the humidification and frying of compressed seeds of the castor plant in a continuous multi-stage heating kettle. This study provides equations for calculating the intensity of phase transformation on the inner and outer surfaces of the wet layer. Data verification indicates the adequacy of the mathematical model, effectiveness of the numerical method, and possibility of their use in optimizing the modes of wet–heat treatment for compressed seed raw material.

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Section: Discussionmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Heat and Mass Transfer during Moisture–Heat Treatment of Castor Beans to Improve the Quality of Vegetable Oil

2022

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Heat and Mass Transfer in Spray Drying Processes with Convective-Radiant Energy Supply

Akulich,

Slizhuk

2023

Theor Found Chem Eng

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Heat and mass transfer of drops of concentrated solutions during spray dehydration under conditions of convective-radiation energy supply

Akulich

Sednin

Pozdnyakova

2023

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

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The results of modeling the dehydration of drops of a concentrated liquid, on the example of ceramics, with convective-radiation energy supply under conditions of direct-flow and counter-current phase motion, as well as pulsed counter-flows of gas, are presented. A model for the dehydration of a single drop is formulated based on the equations of heat conduction with a source term and diffusion of moisture, taking into account the change in its size due to evaporation. This takes into account the influence of the convective vapor flow from the evaporating droplet surface (Stefan flow), as well as the blowing of evaporating vapor into the hot gas flow on the heat transfer coefficient (Spalding correction). The impact of infrared radiation is described by the Bouguer equation. The equation of motion of a drop in a gas flow takes into account the forces due to gravity, the difference in velocities and phase densities. As a result of numerical simulation, it was found that with countercurrent phase movement, the intensity of dehydration is higher than with cocurrent flow. This is due to both an increase in the relative velocity of the phases and an increase in the residence time of the drop in the intense region of infrared radiation. It is shown that further intensification of evaporation is possible due to the creation of pulsed counter gas flows. The calculated results are compared with the experimental data, which confirms the adequacy of the model. The results of the study can be useful in the development of new heat technologies and devices for dehydration of concentrated solutions and suspensions.

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Thermohydrodynamic Processes in Spray Drying with Convective–Radiation Energy Supply

Cited by 3 publications

References 9 publications

Mathematical Modeling of Heat and Mass Transfer during Moisture–Heat Treatment of Castor Beans to Improve the Quality of Vegetable Oil

Mathematical Modeling of Heat and Mass Transfer during Moisture–Heat Treatment of Castor Beans to Improve the Quality of Vegetable Oil

Heat and Mass Transfer in Spray Drying Processes with Convective-Radiant Energy Supply

Heat and mass transfer of drops of concentrated solutions during spray dehydration under conditions of convective-radiation energy supply

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