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Research Article
Heat Distribution Within a Raw Cotton Seed
Issue:
Volume 13, Issue 3, September 2026
Pages:
35-40
Received:
25 August 2026
Accepted:
4 September 2026
Published:
20 September 2026
Abstract: The drying and active ventilation of raw cotton are important technological processes that directly affect the quality, storage stability, and further processing of cotton. During drying, heat and moisture transfer within individual cotton seeds plays a significant role in determining the efficiency of the overall process. Therefore, mathematical modeling of heat distribution inside a cotton seed is essential for improving and optimizing drying conditions. The purpose of this study is to develop and validate a mathematical model describing the heat distribution process inside a raw cotton seed during active ventilation and drying. For this purpose, an individual cotton seed is represented as a spherical object, and the heat conduction process inside the seed is described by a system of differential equations considering moisture evaporation and convective heat transfer between the seed surface and the surrounding drying medium. The boundary value problem is solved using the method of separation of variables (Fourier method). The unknown coefficients of the mathematical model are determined by applying the least squares method to experimental data. The proposed mathematical model was evaluated by comparing theoretical calculations with experimental results obtained at drying-agent temperatures of 100°C and 150°C. The comparison demonstrated good agreement between the calculated and experimental temperature distributions, with a deviation of less than 5%. This confirms the adequacy and reliability of the developed model for describing the heat transfer process inside raw cotton seeds under active drying conditions. The results of the study provide a theoretical basis for determining rational drying parameters and optimizing technological operating modes of industrial installations used for the drying and storage of raw cotton. The developed approach can also be applied to further investigations of coupled heat and moisture transfer processes in cotton seeds.
Abstract: The drying and active ventilation of raw cotton are important technological processes that directly affect the quality, storage stability, and further processing of cotton. During drying, heat and moisture transfer within individual cotton seeds plays a significant role in determining the efficiency of the overall process. Therefore, mathematical m...
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Research Article
Mathematical Modeling of Mechanical Characteristics of Transient Processes of Asynchronous Electrical Drives of Weaving Machines in Textile Enterprises
Issue:
Volume 13, Issue 3, September 2026
Pages:
41-46
Received:
25 August 2026
Accepted:
4 September 2026
Published:
20 September 2026
Abstract: Asynchronous electric motors are widely used in industrial electric drives, including textile enterprises, where their operating efficiency and dynamic characteristics directly affect the energy consumption and productivity of technological equipment. Therefore, accurate mathematical modeling of asynchronous motors is important for analyzing transient operating conditions, determining their electromagnetic and mechanical characteristics, and improving the efficiency of industrial electric drive systems. The purpose of this study is to develop a mathematical model of the 4A100L6U3 squirrel-cage asynchronous electric motor and investigate its dynamic and mechanical characteristics during the starting process. A three-phase asynchronous motor with a rated power of 2.2 kW, supply voltage of 220/380 V, and nominal rotational speed of 950 rpm was selected as the research object. A mathematical model of the motor was developed to describe its electromagnetic and mechanical behavior. Based on the developed model, transient processes occurring during motor starting were simulated and analyzed. The changes in the main electromagnetic and mechanical parameters were investigated, and the mechanical characteristic of the asynchronous electric drive was constructed. Particular attention was given to the starting torque, critical torque, nominal torque, and slip characteristics. The simulation results demonstrate the dynamic behavior of the 4A100L6U3 asynchronous motor during the starting process and provide a basis for evaluating its operating characteristics under industrial conditions. The obtained mechanical characteristic and analyzed torque and slip parameters allow the main operating regimes of the electric drive to be assessed and optimized. The results of the study can be used to improve the energy efficiency and reliability of electric drives in textile enterprises, optimize the operating modes of technological equipment, and improve the control and regulation systems of asynchronous electric motors
Abstract: Asynchronous electric motors are widely used in industrial electric drives, including textile enterprises, where their operating efficiency and dynamic characteristics directly affect the energy consumption and productivity of technological equipment. Therefore, accurate mathematical modeling of asynchronous motors is important for analyzing transi...
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Research Article
Nonlinear Magneto-convective Flow of Jeffery Fluid Through a Poro-elastic Medium with Fluid-structure Interaction
Issue:
Volume 13, Issue 3, September 2026
Pages:
47-58
Received:
21 August 2026
Accepted:
31 August 2026
Published:
30 September 2026
Abstract: Consideration of non-Newtonian fluid flow in combination with deformable porous materials is necessary for many engineering applications involving thermal transport. These applications combine fluid dynamics, heat transport, and structural deformation, with or without interaction. This work analyses nonlinear convective heat transfer of a Jeffery fluid flowing through a deformable porous medium under the effect of fluid-structure interaction, variable fluid properties, nonlinear buoyancy, magnetic forces, and viscous dissipation and Ohmic heating. A coupled fluid flow and heat transport solid deformation problem is formulated and converted to a set of nonlinear PDEs. These equations are used to construct the model, and the SCCM is used for the numerical solution. The fourth-order Runge– Kutta shooting method is used to check the results and control the accuracy of the numerical solution. Viscous dissipation and Ohmic heating study showed that the combination of both effects assists internal energy generation, leading to an increase in temperature, while fluid velocity and solid deformation are altered. The influence of a magnetic field is realized when the Lorentz force acts on the fluid. An increase in porosity leads to an increase in the fluid flow and solid deformation. Stronger nonlinear buoyancy strengthens convection, harnessing the fluid’s motion and thermodynamic transport capacity. The overall results show that fluid-structure interaction modeling with inhomogeneous properties, nonlinear buoyancy, magnetism, viscous friction, and Ohmic dissipation captures a more accurate description of transport phenomena occurring in deformable porous media. The results add to existing literature and provoke new directions for the study and determination of optimal configurations of engineering systems in which viscoelastic fluids interact with porous medium structures.
Abstract: Consideration of non-Newtonian fluid flow in combination with deformable porous materials is necessary for many engineering applications involving thermal transport. These applications combine fluid dynamics, heat transport, and structural deformation, with or without interaction. This work analyses nonlinear convective heat transfer of a Jeffery f...
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Pardaev Xanimkul Normamatovich
