scholarly journals Wood pellets transport with vibrating conveyor: experimental for DEM simulations analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Gelnar ◽  
Rostislav Prokeš ◽  
Lucie Jezerska ◽  
Jiri Zegzulka
Keyword(s):  
Particle Size ◽  
Energy Intensity ◽  
Angle Of Repose ◽  
Physical Parameters ◽  
Typical Pattern ◽  
Wood Pellets ◽  
Comprehensive Overview ◽  
Vibration Machine ◽  
Dem Simulations ◽  
Dynamic Angle

AbstractThis work presents a comprehensive overview of the mechanical-physical parameters of the transport material affecting the vibratory transport. For this purpose, spruce pellets of different lengths, oak rods and spruce crush were tested. The determined parameters were particle size distribution and shape, internal friction, static and dynamic angle of repose. The samples were transported by a patented validation vibrating conveyor. Various settings were used. The results show that by changing the shape, it is possible to reduce friction or resistance as well as energy intensity during transport. It was observed that perfect shapes and lighter particles have lower friction, but a more pronounced bounce. Therefore, it does not form a typical pattern during transport, as in the case of an imperfectly shaped one. There is also included a simulation of the discrete element method. The study shows the possibility of the vibration machine where the material can be conveyed either directionally or sorted.

Physicochemical and grinding characteristics of dragonhead seeds

2013 ◽  
Vol 27 (4) ◽  
pp. 403-408 ◽  
Author(s):  
D. Dziki ◽  
A. Miś ◽  
B. Gładyszewska ◽  
J. Laskowski ◽  
S. Kwiatkowski ◽  
...  
Keyword(s):  
Particle Size ◽  
Seed Mass ◽  
Mesh Size ◽  
Static Friction ◽  
Angle Of Repose ◽  
Wheat Grain ◽  
White Form ◽  
Average Size ◽  
Ground Material ◽  
Dynamic Angle

Abstract The results of investigations on the physicochemical and grinding characteristics of Moldavian dragonhead seeds are presented. The data obtained showed that the physical properties (average size, sphericity, surface area, 1 000 seed mass, dynamic angle of repose, coefficient of static friction, and bulk and true densities) of the white and blue form of dragonhead seeds were not significantly different. Both forms of dragonhead showed similar levels of protein (average of 21%), whereas the blue form of dragonhead had a lower fat content (average of 23.1%) and higher mucilage content (13.35%) in comparison to the blue form of seed (24.6 and 9.95%, respectively). Antioxidant capacity of dragonhead seeds was comparable for both forms and averaged about 40%, which corresponded to EC50 values of 0.12 and 0.13 mgml-1 for the white and blue forms, respectively. The grinding material showed similar particle size distribution of ground material for both forms of dragonhead seeds. The lowest values of specific grinding energy were obtained for the white form of dragonhead seeds, those for the blue form were significantly higher. Grinding of dragonhead seeds using a screen 2.0 mm mesh size caused screen hole clogging. This problem did not occur when dragonhead seeds were mixed with wheat grain.

scholarly journals PREPARATION AND EVALUATION OF CHITOSAN SODIUM ALGINATE CARBAMAZEPINE MICROSPHERES

2017 ◽  
Vol 10 (3) ◽  
pp. 271 ◽  
Author(s):  
Sreeja C Nair ◽  
Karthika Ramesh ◽  
Krishnapriya M ◽  
Asha Paul
Keyword(s):  
Drug Delivery ◽  
Particle Size ◽  
Controlled Release ◽  
Sodium Alginate ◽  
Physical Parameters ◽  
Effective Management ◽  
Release Drug ◽  
Conventional Drug ◽  
Preparation And Evaluation ◽  
Evaluation Parameters

ABSTRACTObjective: The objective behind our study is that a mucoadhesive rectal hydrogel chitosan sodium alginate carbamazepine (CBZ) microspheres forthe purpose of controlled release for the treatment of epilepsy to avoid the possible side effects.Methods: The study was conducted to formulate controlled release chitosan sodium alginate CBZ microspheres with the dispersion of CBZ into thenatural polymers chitosan and sodium alginate forming microspheres conducting along with their evaluation studies.Results: The formulated microspheres were subjected to various evaluation parameters, and all the physical parameters examined are within theacceptable limits. Further, the optimized microsphere formulation (CM5) was characterized. Hence, the developed optimized microsphere formulation(CM5) seems to be a viable substitute to conventional drug delivery system for the effective management of epilepsy.Conclusion: The prepared formulation also provides a desired CBZ loaded sodium alginate microspheres with the controlled release drug delivery.Keywords: Carbamazepine, Sodium alginate microspheres, Particle size.

scholarly journals Design of a device for rocks strength properties determining to solve the tasks of rock rock-cutting machines design

2018 ◽  
Vol 224 ◽  
pp. 02084
Author(s):  
Leonid T. Dvornikov ◽  
Viktor A. Korneyev
Keyword(s):  
Particle Size ◽  
Energy Intensity ◽  
Average Particle Size ◽  
Rock Cutting ◽  
Strength Properties ◽  
Rock Massif ◽  
Average Particle ◽  
Mining Engineering ◽  
Rock Destruction ◽  
Cis Countries

The article presents methods for rocks strength properties determining in mining machines engineering in Russia, CIS countries and Europe. It is shown that general drawback of methods considered is lack of possibility of carrying out instant tests at various points in rock massif. Criteria are given for the method of rocks strength properties determining as applied to mining engineering tasks. Based on established criteria, the fundamentally new method has been developed. Technical devices are proposed for the method implementation in testing individual samples and rock massif. Construction of the laboratory stand estimating energy intensity of rock destruction is presented. Relationship between its value, coefficient of strength according to the M.M. scale of Protodyakonov and average particle size of the destroyed rock is shown.

Storage Conditions and Particle Size Effects on Powder Cohesion Index Using Stable Micro System

2013 ◽  
Vol 701 ◽  
pp. 415-419
Author(s):  
Salam A. Mohammed ◽  
Ezzat C Abdullah ◽  
Abdul Aziz A. Raman
Keyword(s):  
Particle Size ◽  
Storage Conditions ◽  
Effect Study ◽  
Angle Of Repose ◽  
Humidity Effect ◽  
Hausner Ratio ◽  
Powder Flowability ◽  
Low Humidity ◽  
General Expectation ◽  
Micro Systems

Flowability indicates the degree of ease of flow. For dynamic (or aerated) flowability, Hausner Ratio (HR) and Angle of Repose (AOR) have been established as a strong indicator for flowability. In this work the influence of particle size and relative humidity (RH) on the flowability of silica gel and ballotini powders were investigated using a non-aerated method. The non-aerated method is a cohesion index (CI) measurement based on a Stable Micro Systems TA.XT PLUS texture analyzer (SMS). The results of the indicator measured confirmed the general expectation that the fine powders are cohesive and the coarse powders are free-flowing at low RH. An interesting trend was observed on the humidity effect study where in low humidity, the powder maintained to be more free-flowing than the powder after the drying process up to a certain limit of RH. However at humidity above this limit, the flowability indicator of the powder is decreasing below than the measureed dry powder flowability. Moreover the apparatus has proven equipment ability to predict even small changes in cohesion value and that using non-aerated methods is greatly important to evaluate the flowability and the powder behavior under different conditions (dynamic and static). It is observed that there are numerous factors related with powder flowability.

scholarly journals Retorting conditions affect palatability and physical characteristics of canned cat food

2017 ◽  
Vol 6 ◽  
Author(s):  
Esther A. Hagen-Plantinga ◽  
Denmark F. Orlanes ◽  
Guido Bosch ◽  
Wouter H. Hendriks ◽  
Antonius F. B. van der Poel
Keyword(s):  
Particle Size ◽  
Physicochemical Properties ◽  
Physicochemical Characteristics ◽  
Physical Characteristics ◽  
Physical Parameters ◽  
Time Profiles ◽  
Temperature Time

AbstractThe effects of different temperature and time conditions during retorting of canned cat food on physicochemical characteristics and palatability were examined. For this purpose, lacquer cans containing an unprocessed loaf-type commercial cat food were heated in a pressurised retorting system at three specified temperature–time profiles (113°C/232 min, 120°C/103 min and 127°C/60 min) to equal a similar lethality (F0 value = 30). Physicochemical properties (viscosity, texture, particle size, pH) were determined, and a 10 d three-bowl palatability test was performed with ten European shorthair cats. Retorting at 113°C/232 min resulted in differences in all the physical parameters examined (<viscosity, firmness, adhesiveness, and > particle size). Significant pH differences were observed (6·53, 6·63 and 6·66 for T113/232, 120 and 127°C, respectively). Preference ratios were 0·38, 0·31 and 0·31 for T113/232, 120 and 127°C, respectively (P = 0·067). It can be concluded that different retorting temperature–time profiles with equal F0 value significantly affect physical characteristics and tended to affect palatability of moist cat food.

Effect of Grinding Aids on the Particles Characteristics of Cement and Analysis of Action Mechanism

2014 ◽  
Vol 936 ◽  
pp. 1404-1408
Author(s):  
Ji Hui Zhao ◽  
Dong Min Wang ◽  
Xue Guang Wang ◽  
Shu Cong Liao ◽  
Hui Lin
Keyword(s):  
Particle Size ◽  
Lattice Distortion ◽  
Fine Particles ◽  
Particle Morphology ◽  
Angle Of Repose ◽  
Chemical Bonds ◽  
Action Mechanism ◽  
Grinding Aids ◽  
Grinding Mechanism ◽  
Grinding Time

Effects of triethanolamine grinding aids on the angle of repose, fineness, particle morphology and particle size distribution of cement are studied, and the action mechanism of grinding aids is discussed by surface tension and Zeta potential. The results show that the powder fluidity and particle circularity of cement are improved and the particle size and grinding time of cement are effectively reduced by grinding aids. And Grinding aids improve the particles content in the range of 3-32μm particle size by 6.63% and promote destruction of the chemical bonds and lattice distortion of cement mineral during the grinding process. The dispersion grinding mechanism of grinding aids is that they can reduce the surface free energy of powder to prevent fine particles from closing each other and shield or neutralize the particles surface partial charge to prevent facture surface from healing and promoting the cracks to extend easily.

scholarly journals Particle size and physical characteristic of corn milling results using hammer mill as poultry feed ingredients

2021 ◽  
Vol 11 (2) ◽  
pp. 298-302
Author(s):  
Mustakin ◽  
Sri Purwanti ◽  
Jasmal A Syamsu
Keyword(s):  
Particle Size ◽  
Specific Gravity ◽  
Bulk Density ◽  
Angle Of Repose ◽  
Poultry Feed ◽  
Hammer Mill ◽  
Feed Ingredients ◽  
Machine Performance ◽  
Randomized Design ◽  
The Difference

Feed ingredients used in poultry feed, generally require size reduction before being used in mixing rations, such as corn. The process of reducing the size of corn is the initial process that must be carried out for ration production. The machine that is commonly used to reduce the size is the hammer mill. This study aims to determine the particle size and physical characteristics of corn as a poultry feed ingredient by grinding using a hammer mill. The study was arranged using a completely randomized design with four treatments of amount of corn milled with three replications. The treatments were P1 = 5 kg, P2 = 10 kg, P3 = 15 kg, and P4 = 20 kg. Parameters observed were particle size and degree of fineness of milled results, bulk density, and specific gravity, angle of repose, capacity and efficiency of hammer mill machine performance. The results showed that the largest particle size was P4 at 3.167 mm with a fineness degree of 4.927 and the smallest particle size was P1 at 2.810 mm with a fineness degree of 4.756. Overall, the category of corn milling results using a hammer mill is the category of coarse milling results. The results of the analysis of variance showed that the amount of corn milled treatment had no significant effect on the angle of repose, specific gravity and bulk density of corn milled using a hammer mill. The difference in the number of milled corn does not affect the difference in the particle size of the corn produced from the milling results, so it does not affect the angle of repose, specific gravity and bulk density.

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