Theoretical background of calculation of the parameters of the device for grain cleaning from ergot sclerotia

Сысуев, В. А.; Saitov, V. E.; Farafonov, V. G.; Suvorov, Anton; Саитов, А. В.

doi:10.3103/s1068367417030156

Cited by 22 publications

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“…(3) Taking into account the parameters (width and thickness) of the rye grains under consideration and the assumption of the speed υz of the movement of the grain in the liquid 0.05...0.10 m/s, the kinematic viscosity of the liquid ν = 1.01•10 -6 m 2 /s (at a water temperature of 20 0 C) the coefficient c of hydrodynamic resistance for a cylindrical grain c = 1.2, and for a spheroidal grain c = 0.9 [23,24].…”

Section: Resultsmentioning

confidence: 99%

Influence of the angle of the bath bottom inclination in ergot isolation device on grain immersion in a liquid

2020

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For the mechanization of the allocation of toxic ergot from the rye seeds in a wet way, the urgent issue is the development of a device containing a bath with an aqueous solution of salt. The aim of the study is to determine the influence of the angle of inclination of the bottom of the bath on the rate of immersion of grains in the fluid of the device for separating ergot from rye seeds, which will ensure the efficiency of the process. Theoretically, we consider the movement of individual rye grains along the inclined surface of the bottom of the bath of the ergot extraction device. Rye grains have a density ρz = (1.2...1.5)·103 kg/m3, a length lz = (5.0. 10.0)·10-3 m, a width b = (1.4...3.6)·10-3 m, and a thickness δ = (1.2 3.5)·10-3 m. Geometric models of these grains are presented in the form of cylindrical and spheroidal grains. The movement of grain on the surface of the bottom of the bath of an ergot extraction device is considered at angles of inclination α = 27, 30, 40, 50, 60, 70, 80, and 90 degrees by the methods of mathematical modeling, classical mechanics using the laws of hydrodynamics. It was established that the angle α of the slope of the surface of the bottom of the bathtub to the horizontal should be taken at least 650, at which accumulation is excluded due to the rapid rolling of the grain and a decrease in the thickness of its layer.

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Section: Resultsmentioning

confidence: 99%

Influence of the angle of the bath bottom inclination in ergot isolation device on grain immersion in a liquid

2020

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“…To achieve this goal, practical experiments were carried out on the stream of winter rye grain Falenskaya 4 with a moisture content of 14% from a height of h = 60•10 -3 m [17] into water and an aqueous solution of sodium chloride (NaCl) of various densities ρzh [18,19]. The cereal material consisted of 10000 winter rye grains and 1000 ergot sclerotia.…”

Section: Methodsmentioning

confidence: 99%

Study of ergot isolation from rye in an aqueous salt solution

2020

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The aim of the research is to determine the effectiveness of ergot isolation and to estimate grain losses in waste when the cereal material is immersed in the stream material in water and an aqueous solution of salt of different densities ρzh from the specific grain load gsp. Practical experiments were carried out by feeding grain material of winter rye of Falenskaya 4 variety with a moisture content of 14% from a height of h = 60∙10-3 m into water and an aqueous solution of sodium chloride (NaCl) with a density of 1030, 1060, 1090, 1120, 1150 and 1180 kg/m3. The variation of the specific grain load gsp was carried out according to the values of 0.674; 1.469; 2,871; 4.449 and 7.221 kg/(s∙m), which corresponded to the opening of the outlet window of the bunker of the experimental setup 10.0; 15.0; 20.0; 25.0 and 30.0∙10-3 m. The temperature of ambient air, water and an aqueous solution of salt was 200C. It has been established that the density ρzh of an aqueous salt solution has a greater influence on the result of the technological process than the specific grain load gsp. At a density ρzh of the aqueous solution of the salt of 1150 kg/m3, there is a 100% emergence of ergot sclerotia on the surface of the solution, and the losses of the PZ grain to the waste do not exceed 2,52%, which corresponds to the agrotechnical requirements for the final grain cleaning machines.

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“…Найдем значение времени τ из выражения (13) для промежуточных значений физико-механических свойств зерновки (с z sr = 1,17 • 10 -3 м, ρ z sr = 1,3 • 10 3 кг/м 3 ) и жидкости (ρ zh = 1,0 • 10 3 кг/м 3 ), а также от коэффициента с = 0,9 гидродинамического сопротивления 13 [15], которое составит 0,02 с.…”

Section: результаты исследованияunclassified

“…Это свидетельствует о том, что проведенные эксперименты по погружению зерен в жидкости различной плотности согласуются с теоретическими исследованиями для эллипсоидальных зерновок. Относительное отличие объясняется принятой моделью и погрешностями эксперимента 15 .…”

Section: результаты исследованияunclassified

“…Высота h падения зерновок в воду или водные растворы соли обеспечивалась при помощи набора металлических пластин, устанавливаемых над сосудом. Каждая пластина имела толщину 1,5 • 10 -3 м, длину 0,28 м и ширину 0,04 м. Зерновки в количестве 20 штук устанавливались на пластинку и сбрасывались в воду или в водный раствор соли с высоты h = 0,050 м, при которой происходило 100-процентное преодоление поверхностного натяжения жидкости зерновками без захвата пузырьков воздуха и погружение их в жидкость 6 [15]. 5 Павловский Г. Т., Птицын С. Д. Очистка, сушка и активное вентилирование зерна.…”

Section: Introductionunclassified

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Investigation of Grain Movement Parameters in the Liquid of the Device for Removing Ergot

Сысуев

Saitov

Farafonov

et al. 2019

Engineering Technologies and Systems

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Introduction.When harvesting grain crops, various trash and harmful impurities come to the combine bunker together with grains. These harmful impurities include egot sclerotia, which are poisonous. Various modern grain cleaning machines do not provide for complete separation of ergot sclerotia from grains, because of the closeness of their linear dimensions (width, thickness and length) and speed of soaring. Cleaning seeds from ergot sclerotia having the density less than density of grain, is possible in an aqueous solution of salt. For the mechanization of the allocation of sclerotium ergot from rye seeds by a wet method, the urgent issue is the development of a device for cleaning grain material. Materials and Methods.The immersion of separately taken rye grains in water (ρzh = 1,0 ∙ 103 kg/m3) and aqueous solutions of sodium chloride (NaCl) with density ρzh = 1,09 ∙ 103 kg/m3 and 1,15 ∙ 103 kg/m3. The ellipsoid is taken as the geometric model of the grains. Theoretical studies were performed for the grain density ρz from 1,2 ∙ 103 kg/m3 to 1,5 ∙ 103 kg/m3, lengths lz from 5,0 ∙ 10–3 m to 10,0 ∙ 10–3 m, width b from 1,4 ∙ 10–3 m to 3,6 ∙ 10–3 m, and thickness δ from 1,2 ∙ 10–3 m to 3,5 ∙ 10–3 m based on the methods of mathematical modelling using the laws of hydrodynamics. For practical experiments, there was chosen the gains of the winter rye variety Falenskaya 4 having the gain density ρz from 1,1 ∙ 103 kg/m3 to 1,3 ∙ 103 kg/m3, length lz from 5,0 ∙ 10–3 m to 8,0 ∙ 10–3 m, width b from 1,4 ∙ 10–3 m to 3,6 ∙ 10–3 m, and thickness δ from 1,2 ∙ 10–3 m to 3,5 ∙ 10–3 m. Results. The speed ʋz and duration tп of grain immersion in liquids are main parameters taken into account when developing a machine for cleaning the grain material from ergot sclerotia with a wet method. The values of these quantities determine the structural and technological parameters of the machine under developing. To determine these parameters, it is necessary to take into account the geometric shapes of the grains, which have a large variety. An ellipsoid with a small 2cz = δ, an average 2bz = b and a large 2az = lz axes is proposed as the closest to the shape of the grain. From the basic law of the dynamics of the grain movement in liquids of various densities ρzh a formula was obtained for determining its velocity, the calculated values for which are consistent with the experimental data obtained. Discussion and Conclusion. It is established that the calculated values of the speed of grain immersion in liquids of different density are comparable with the experimental values of the same order. They are close and differ by no more than 10 %. This approach to determining the speed of grain immersion in a liquid can be used in developing a machine for cleaning a grain material with the wet method to substantiate its structural and technological parameters.

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Theoretical background of calculation of the parameters of the device for grain cleaning from ergot sclerotia

Cited by 22 publications

References 0 publications

Influence of the angle of the bath bottom inclination in ergot isolation device on grain immersion in a liquid

Influence of the angle of the bath bottom inclination in ergot isolation device on grain immersion in a liquid

Study of ergot isolation from rye in an aqueous salt solution

Investigation of Grain Movement Parameters in the Liquid of the Device for Removing Ergot

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