Dynamics of inter-phase interaction of components during mixing

Stadnyk, Igor; Vasyliv, Volodymyr; Kos, Tetiana

doi:10.31073/foodresources2020-15-19

Cited by 3 publications

(4 citation statements)

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“…The implementation of this principle significantly affects various aspects of the activity, in particular, reducing costs and increasing the profitability of production. Optimisation of processes and implementation of modern technologies reduces production costs, while effective resource management contributes to their economical use (Stadnyk et al, 2020). This is important for enterprises in a competitive environment, where production efficiency is a key success factor and an important component of a successful enterprise development strategy in a changing economic environment.…”

Section: A Derkach Et Almentioning

confidence: 99%

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Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Derkach,

Stadnyk,

Piddubnyi

et al. 2024

Tehnìka ta energetika

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The relevance of the study is determined by its focus on one of the key problems of the Ukrainian economy, namely the problem of energy resources, which is a necessary step in the development of resource management and planning strategies in the context of modern challenges and instability in the energy market. The purpose of the study is to determine the hydrodynamic and mass-heat transfer characteristics of the process of mixing liquids with different thermal potentials, and to investigate the influence of design factors on the intensity and efficiency of the flow jet. Experimental methods were used to specify the hydrodynamic and mass-heat transfer parameters of the liquid mixing process, and modelling was used to analyse the influence of design factors and develop a scientifically based methodology for calculating new device designs. An approach is obtained that allows solving two problems simultaneously: to decrease energy costs through their rational operation and to reduce environmental pollution, avoiding harmful emissions that occur during fuel combustion. The functional scheme of the test stand is described, the research methodology is presented, and statistical modelling of the influence of parameters on the length of the liquid jet is carried out. Studies of the energy efficiency of the initial stage of the interaction of thermal potentials during the generation of a liquid jet in a recuperative heat exchanger of mixed action to ensure storage conditions and potential movement in front of the nozzle are presented. A mathematical model for describing the length of a continuous water jet when flowing out of the nozzle is proposed and an analysis of the laminar flow of liquid from the nozzle is performed. The length of the continuous water jet when flowing out of the nozzle is determined and the technical capabilities of the process are identified. The efficiency of installing the tip in front of the nozzle for creating turbulent mixing and the method of controlling the water supply during the mixing of thermal potentials are determined. To control the water supply process, a step-by-step method has been developed that allows gradually increasing or decreasing the length of a continuous water jet through the nozzle. The results of the study provide an opportunity to optimise heat exchangers and mixing machines to increase their efficiency and productivity

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Section: A Derkach Et Almentioning

confidence: 99%

“…I. Stadnyk et al (2020) noted that even small changes in the flow rate of the jet can lead to significant changes in the width of the jet itself. It is important to note that exposure to a low liquid flow rate leads to an increase in the width of the jet core while reducing the speed of the central part of the flow.…”

mentioning

confidence: 99%

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Derkach,

Stadnyk,

Piddubnyi

et al. 2024

Tehnìka ta energetika

View full text Add to dashboard Cite

show abstract

Section: A Derkach Et Almentioning

confidence: 99%

Section: A Derkach Et Almentioning

confidence: 99%

Untitled

2024

Tehnìka ta energetika

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The relevance of the study is to develop an effective system for controlling the pressure in the air supply in motorised breathing apparatus to ensure effective protection of employees from dangerous aerosols and improve their health. The goal was to create an automated air pressure control system in a motorised breathing apparatus using a proportional-integral-derivative controller. For this purpose, the simulation method was used. In order to avoid unforeseen situations of deterioration of the level of protection, the structure of the pressure control system of a motorised respirator has been developed with the selection of the appropriate controller based on the obtained dependences of the influence of the parameters of the breathing mode and the amount of pressure in the under-mask space of the respirator, which ensures an appropriate comfortable mode of operation. This allowed developing a simulation model with a PID controller that would provide the appropriate pressure values within the permissible limits (50-370 Pa). It is proved that the proportional-integral-derivative controller maintains the pressure in the respirator mask within certain limits both with an increase and with a decrease in the control signal, preventing excessive fluctuations in the controlling variable, which leads to an extension of the service life of the filter elements and a reduction in electricity consumption for the operation of the fan motor. Based on modelling the operation of the pressure control system in different modes of operation, it is shown that when using a PID controller with defined parameters, the system provides compensation for changes in air

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Peculiarities of heat exchange in dough under rotary rollers action

Piddubnyy,

Kahanets-Havrylko,

Fedoriv

et al. 2023

Visnyk TNTU

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Any impact of mechanical action on a viscous medium contributes to the transformation of a volumetric spongy-reticular solid structure into a gluten skeleton, as it defines the elastic and viscous characteristics of the medium and it is important in gas dispersion in a liquid. Thus, the aim of the study under consideration was to determine the relationship between the working surface of the working body and the amount of heat Q transferring per unit of time from the roller wall to the medium. The problem of the development of a generalized model of a working process of rollers’ action on the medium has been solved due to the study under discussion. The problem is aimed at obtaining the structural, expenditure, and energy characteristics, as well as at determining the ways of increasing the efficiency of such class of machines operation under deformation modes conditions. Some peculiar features of the compression area have been taken into consideration in cases when the temperature pressure value by the angle of rotation varies constantly. It was proved, that the heat-transfer coefficient value can be calculated quite approximately as it is necessary to take into account an available area influencing the heat exchange and the movement speed on the working dough roller surface in the injection area. Some temperature state variations of the dough in bagels production during its compressing, injection, and transportation have been determined. It was admitted, that the impact of the liquid phase temperature of the working medium is determined by the value of its kinematic viscosity . The temperature variations were determined by means of thermal imaging of a pilot plant.

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Dynamics of inter-phase interaction of components during mixing

Cited by 3 publications

References 0 publications

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Achievements and problems in studying the mechanism of thermal potential transfer regulation between liquids

Untitled

Peculiarities of heat exchange in dough under rotary rollers action

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