scholarly journals RATIONAL DRYING MODES FOR RAPE SEEDS

2021 ◽  
pp. 99-103
Author(s):  
Vadym Paziuk ◽  
Eugenia Shemanska ◽  
Dasha Paziuk
Keyword(s):  
Experimental Data ◽  
Experimental Studies ◽  
Acid Number ◽  
Convective Drying ◽  
Coolant Temperature ◽  
Drying Process ◽  
Temperature Range ◽  
Automatic Program ◽  
Processing Information ◽  
Kinetics Of

Studies on finding rational regimes for drying rapeseed based on drying kinetics and qualitative characteristics are presented. The value of the acid number of oil and laboratory germination of rapeseed on the 7th day of germination were taken as a qualitative characteristic. Experimental studies of the kinetics of the rapeseed drying process were performed on a convective drying stand using an automatic program for collecting and processing information, which makes it possible to obtain more accurate experimental data. According to the obtained experimental data with the help of an automatic program for collecting and processing information, graphs of the process kinetics from the influence of the coolant temperature are constructed. The presented graphs show the drying curves and drying speed curves that characterize the drying process that takes place during the period of falling drying speed. The study of the kinetics of the drying process of rapeseed in a single-stage mode at coolant temperatures of 50 - 80°C showed that for better quality it is necessary to use low-temperature modes. The acid number of oil in this temperature range does not change significantly and is 1.03 - 1.8 mg / g of oil. These values of the acid number of the oil correspond to the normative value. The greatest effect on the germination of rapeseed is observed from the temperature of the coolant. Increasing the temperature by 10 ° C in the temperature range from 50 to 80 ° C reduces the germination of the material. According to laboratory studies, we determined the drying regime of 50 ° С with a germination of 97% to be the most expedient and rational. All other drying regimes significantly reduce the germination of rapeseed and can not be recommended, as the germination value is less than the state standard of Ukraine 2240-93.

scholarly journals Investigation of low-temperature drying modes plant capillary-porous materials spherical shape

2018 ◽  
pp. 7-14
Author(s):  
V.М. Pazyuk
Keyword(s):  
Porous Materials ◽  
Heat Carrier ◽  
Experimental Studies ◽  
Spherical Shape ◽  
Convective Drying ◽  
Drying Rate ◽  
Drying Process ◽  
Exchange Processes ◽  
Low Temperature Drying ◽  
Kinetics Of

The results of experimental studies of the drying of capillary-porous materials of spherical shape from the influence of the temperature of the heat carrier are given.Spherical granules with a diameter of 2,2 mm were taken to determine the rational modes of drying of capillary-porous materials. For a better evaluation of the nature of the drying process, experimental design studies were carried out on a convective drying stand in an elementary layer.The program of automatic collection and processing of information allows obtaining data on changes in the mass and temperature of the sample during the removal of moisture, and also performs calculations of kinetics of drying in absolute and relative coordinates. This makes it possible to obtain and compare the kinetic and velocity characteristics of colloid capillary-porous materials drying faster, more accurately and reliably.By the method of Krasnikov V.V. the kinetics of drying of capillary-porous materials of spherical shape with a diameter of 2,2 mm with construction of a generalized drying curve with determination and calculation of drying coefficients is considered.The generalized curve of drying rate is constructed and obtained, which allows us to generalize the process of drying of a capillary-porous spherical material. Also, get the formula and determine the overall length of the drying process through the drying rate for each heat treatment.When comparing the values of the process length obtained by experimental studies and determined by the calculations, the experimental error from the calculation does not exceed 3%.The analysis of heat-mass-exchange processes of drying by means of calculations of temperature coefficient b, Rebinder Rb criterion, heat flow q and coefficient of heat transfer α from the influence of heat carrier temperature has been carried out.

scholarly journals DETERMINATION OF THE ENERGY EFFICIENT MODES FOR BARLEY SEEDS DRYING

2020 ◽  
Vol 61 (2) ◽  
pp. 183-192
Author(s):  
Yu.F. Snezhkin ◽  
V.M. Paziuk ◽  
Zh. O. Petrova ◽  
O.A. Tokarchuk
Keyword(s):  
Energy Efficiency ◽  
Germination Rate ◽  
Initial Moisture Content ◽  
Convective Drying ◽  
Coolant Temperature ◽  
Drying Process ◽  
Two Stage ◽  
Drying Time ◽  
High Germination ◽  
Kinetics Of

For a more accurate study of the kinetics of the barley seeds drying, a convective drying stand with a computerized system of data acquisition and processing on the change in the mass and temperature of the sample from the drying time was used. The kinetic curves of the drying process under the action of three factors were constructed: the temperature of the coolant, heating medium movement rate and the initial moisture content of the seeds. Studies were also conducted and the germination of barley seeds under the action of these factors was analysed. Studies have shown that all factors affect the kinetics of the drying process, but the greatest influence on the germination of seed material comes from the influence of the temperature of the coolant. A three-factor effect on the germination of barley seeds on the 7th day of germination is presented, that indicates the need for low-temperature drying at a coolant temperature of 50°C. In order to increase the intensification and energy efficiency of the drying process, the proposed two-stage drying mode is 65/50°C, which provides intensive heating and evaporation of moisture from the material at the initial stage of the process. Studies on the germination of barley seeds in a two-stage mode showed that the specified drying mode provides a high germination rate of the material up to 99%, an intensity of 83% and an energy efficiency of 62% compared to a rational single-stage drying mode of 50°C and can be recommended for drying barley seeds.

Kinetics of hypso anhydrites dissolution in water. Experimental studies

2019 ◽  
pp. 93-96
Author(s):  
A. L. Lebedev ◽  
I. V. Avilina
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Riccati Equation ◽  
Balance Equation ◽  
Experimental Studies ◽  
Common Ion ◽  
The Common ◽  
Common Ion Effect ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

Experimental study of kinetics of dissolution of hypso anhydrites at 25 ᵒC made it possible to formulate model of the process in the form of a balance equation for the kinetics of dissolution of gypsum, anhydrite (first and second orders, respectively) and kinetics of precipitation of gypsum (second order). The processing of the experimental data were carried out on the basis of the solution of the Riccati equation. When taking into account the common-ion effect on the solubility of gypsum and anhydrite, the calculated values turned out to be more comparable with the experimental ones.

scholarly journals Mathematical modeling of pequi pulp drying and effective diffusivity determination

2017 ◽  
Vol 21 (7) ◽  
pp. 493-498 ◽  
Author(s):  
Elisabete P. de Sousa ◽  
Rossana M. F. de Figueirêdo ◽  
Josivanda P. Gomes ◽  
Alexandre J. de M. Queiroz ◽  
Deise S. de Castro ◽  
...  
Keyword(s):  
Experimental Data ◽  
Effective Diffusivity ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Drying Time ◽  
Air Speed ◽  
Drying Curves ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Best Fit

ABSTRACT The aim of this work was to study the drying kinetics of pequi pulp by convective drying at different conditions of temperature (50, 60, 70 and 80 °C) and thickness (0.5, 1.0 and 1.5 cm) at the air speed of 1.0 m s-1, with no addition of adjuvant. The experimental data of pequi pulp drying kinetics were used to plot drying curves and fitted to the models: Midilli, Page, Henderson & Pabis and Newton. Effective diffusivity was calculated using the Fick’s diffusion model for a flat plate. It was found that, with increasing thickness, the drying time increased and, with increasing temperature, the drying time was reduced. The Midilli model showed the best fit to the experimental data of pequi pulp drying at all temperatures and thicknesses, presenting higher coefficients of determination (R2), indicating that this model satisfactorily represents the pequi pulp drying phenomenon. There was a trend of increase in the effective diffusivity with the increase in pulp layer thickness and temperature.

KINETICS OF EVAPORATION OF A MODEL SOLUTION OF DISTILLERY DREGS CONTAINING PROTEIN, OIL AND SUGAR

2021 ◽  
Author(s):  
А.С. ДАНИЛЬЧЕНКО ◽  
Т.Г. КОРОТКОВА ◽  
С.Ю. КСАНДОПУЛО
Keyword(s):  
Evaporation Rate ◽  
Experimental Studies ◽  
Petri Dish ◽  
Model Solution ◽  
Soluble Carbohydrates ◽  
Drying Process ◽  
Sugar Water ◽  
Oil Water ◽  
Drying Model ◽  
Kinetics Of

Рассмотрена кинетика сушки послеспиртовой барды при 60°С. Объектом исследований была модельная смесь, состоящая из воды, белков, жиров и растворимых углеводов. Представлены результаты исследований кинетики испарения воды и смесей вода–масло, вода–белок, вода–сахар, вода–масло–белок–сахар, помещенных в чашку Петри. Процесс испарения в изотермических условиях протекал в сушильном шкафу Memmert. Установлено, что добавление вещества в воду снижает скорость испарения воды в периоде постоянной скорости сушки, в периоде падающей скорости сушки продолжительность испарения возрастает. По результатам кинетики сушки модельных смесей можно определять коэффициенты активности компонентов и проводить исследование процесса сушки реальных смесей при проектировании сушилок. The kinetics of drying of the distillery dregs at 60°C is considered. The model mixture containing water, proteins, oils and soluble carbohydrates was the object of research. The results of experimental studies of the kinetics of evaporation of water and mixtures of water-oil, water-protein, water-sugar, water-oil-protein-sugar, placed in a Petri dish, are presented. Evaporation under isothermal conditions was carried out in a Memmert drying cabinet. It is established that the addition of the substance into the water reduces the evaporation rate of water in the period of constant drying speed, the duration of evaporation in the period of falling drying speed increases. According to the results of the kinetics of drying model mixtures, it is possible to determine the activity coefficients of the components and conduct a study of the drying process of real mixtures in the design of dryers.

scholarly journals Mechanism of reaction of silica and carbon for producing silicon carbide

2019 ◽  
Vol 45 ◽  
pp. 146867831989141
Author(s):  
Bahador Abolpour ◽  
Rahim Shamsoddini
Keyword(s):  
Experimental Data ◽  
Silicon Carbide ◽  
Reaction Kinetics ◽  
Direct Effect ◽  
Solid Reaction ◽  
Carbon Reduction ◽  
Temperature Range ◽  
Carbon Particles ◽  
Mechanism Of Reaction ◽  
Kinetics Of

The reaction kinetics of carbon reduction of silica were investigated using thermodynamic concepts and by fitting to relevant models the experimental data obtained for this reduction using a thermogravimetric unit in the temperature range of 1566 to 1933 K. The results show that the only way to produce SiC in this reduction is the reaction of Si, SiO, or SiO2 at the surface or by diffusion of SiO inside the carbon particles while CO and CO2 have no direct effect on the process. The controlling step of this reduction at temperatures lower than 1750 K is the chemical gas–solid or solid–solid reaction at the surface of the carbon particles, while at higher temperatures, the rate of SiO diffusing inside the carbon particles controls the rate of this reduction.

Influence of Osmotic Pre-treatment on Convective Drying Kinetics of Figs

2013 ◽  
Vol 9 (2) ◽  
pp. 187-196 ◽  
Author(s):  
Juliana M. Silva ◽  
Muriel G. Cantu ◽  
Vera Rodrigues ◽  
Marcio A. Mazutti
Keyword(s):  
Experimental Data ◽  
Moisture Content ◽  
Osmotic Dehydration ◽  
Sucrose Concentration ◽  
Drying Kinetics ◽  
Soluble Solids ◽  
Convective Drying ◽  
Final Time ◽  
Osmotic Treatment ◽  
Kinetics Of

AbstractThis work evaluated the effects of osmotic dehydration on convective drying kinetics of figs. It used the experimental design methodology to evaluate the influence of sucrose concentration, temperature and time on the amount of total soluble solids (TSS) and moisture content of the figs. After the osmotic dehydration, it evaluated the convective drying kinetics at temperatures from 55 to 75°C. A mathematical model was employed to fit the experimental data. From the experimental data of the osmotic dehydration, it was seen that the moisture content of the figs after the treatment was closely related to the amount of TSS of the figs. Low moisture content and high TSS content were obtained for a narrow range of independent variables comprised between 55–60°C, 55–63 wt% and 260–280 min for temperature, sucrose concentration and exposure time, respectively. In the convective drying kinetics of the figs, there were no verified significant differences in the final time of drying of non-treated and osmotically dehydrated figs. However, the shrinkage was considerably reduced in the osmotically treated figs. The use of osmotic treatment enables the obtainment of figs softer than the simple use of convective drying without changing the final time of drying.

scholarly journals Kinetics Of Fruit Crops Drying With Instant Pressure Release

2020 ◽  
Vol 02 (10) ◽  
pp. 45-54
Author(s):  
Rustamov E.S. ◽  
◽  
Djuraev Kh.F. ◽  
Gafurov K.Kh. ◽  
◽  
...  
Keyword(s):  
Energy Supply ◽  
Infrared Heating ◽  
Convective Drying ◽  
Drying Process ◽  
Fruit Crops ◽  
Technological Parameters ◽  
Pressure Impact ◽  
Instantaneous Pressure ◽  
Kinetics Of

The article covers results of research of drying process of apricot fruits by the method of three-stage energy supply. The main stages of drying have been defined, including: pulsed infrared heating, instantaneous pressure impact, convective drying. Optimal technological parameters of energy supply in the process of drying apricot fruits at each stage have been developed. The choice of the method for the experimental determination of the drying speed by the parameters of the drying agent for the capillary-porous material is substantiated. The sequence of changes in moisture content in a given material under the influence of a three-stage energy supply is described. The conditions for drying fruits are established and the values of the drying speed in the first period for various methods of energy supply have been selected.

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