scholarly journals RESEARCH ON THE EFFECT OF THE INITIAL SPEED OF THE MIXTURE ON THE PROCESS OF LOADING

2019 ◽  
pp. 47-55
Author(s):  
Piven Mykhailo
Keyword(s):  
Surface Area ◽  
Velocity Component ◽  
Initial Velocity ◽  
Surface Density ◽  
Transverse Velocity ◽  
Longitudinal Velocity ◽  
Specific Load ◽  
Longitudinal Velocity Component ◽  
Transverse Velocity Component ◽  
Specific Loading

The work is devoted to the study of the influence of the initial velocity of the loose mixture on the loading process of the vibrating sieve. The regularities of layer thickness, longitudinal and transverse components of velocity, density of loose mixture and specific load on the entire area of a vibrating sieve are established. When the initial velocity is less than velocity of the mixture movement on the sieve is the thickness of the layer has become over the entire surface area, the surface density of the mixture decreases, and the longitudinal velocity component increases with length. The transverse velocity component contributes to the rapid redistribution of the mixture from the congested central area to the unloaded lateral ones. When the initial velocity is equal to the velocity of the mixture movement on the sieve, the thickness of the layer and the surface density of the mixture are constant on the surface area, the longitudinal velocity component is constant along the length and has an initial velocity profile along the width of the sieve, which is aligned with the length. The transverse velocity component decreased and the specific loading deviations increased. When the initial velocity is greater than the velocity of the mixture movement on the sieve, the thickness of the layer decreases, the surface density of the mixture increases, and the longitudinal velocity component decreases with length. The transverse velocity component is almost absent, the specific loading is uneven throughout the sieve area. Thus, the value of the initial velocity affects all the characteristics of the loose mixture, and the nature of changing some of them turns to the opposite. When the mixture is unevenly fed across the width at the inlet of the sieve, the increase of the initial velocity increases the uneven distribution of the specific load over the area of the work surface. The regularities of distribution of the specific load of the sieve are decisive in the design of feeders and distributors of loose mixtures, as well as in calculation of separation modes.

scholarly journals Generalized logarithmic scaling for high-order moments of the longitudinal velocity component explained by the random sweeping decorrelation hypothesis

2016 ◽  
Vol 28 (9) ◽  
pp. 095104 ◽  
Author(s):  
Gabriel G. Katul ◽  
Tirtha Banerjee ◽  
Daniela Cava ◽  
Massimo Germano ◽  
Amilcare Porporato
Keyword(s):  
Velocity Component ◽  
Longitudinal Velocity ◽  
High Order ◽  
Longitudinal Velocity Component ◽  
Logarithmic Scaling

scholarly journals Fragmentation Behaviour of Radial Layered PELE Impacting Thin Metal Target Plates

2018 ◽  
Vol 68 (5) ◽  
pp. 505-511 ◽  
Author(s):  
Chun Cheng ◽  
Xi Chen ◽  
Zhonghua Du ◽  
Jilong Han ◽  
Chengxin Du ◽  
...  
Keyword(s):  
Impact Velocity ◽  
Velocity Component ◽  
Steel Plate ◽  
Transverse Velocity ◽  
Thin Metal ◽  
Metal Target ◽  
Fragmentation Mechanism ◽  
Target Plate ◽  
Transverse Velocity Component ◽  
The Impact

The fragmentation mechanism of the penetrator with lateral effect (PELE) after perforating a thin target plate has been summarised and analysed firstly. Then the fragmentation of radial layered PELE was analysed qualitatively and verified by experiment. In the experiment, the target plates were made of 45# steel and 2A12 aluminium respectively. Qualitative analysis and experimental results show that: for normal PELE without layered, after perforating the thin metal target plate, from the bottom to the head of the projectile, the number of fragments formed by the jacket gradually increases, and the mass of the fragment decreases correspondingly. Compared with the normal PELE without layered, the radial layered PELE is less likely to break into fragments, when impacting the thin metal target plate with the same material and thickness under the same impact velocity. However, from the mechanism of the PELE, when the resistance of the target plate is large enough, and the duration of pressure is long enough, the radial layered PELE also can break into fragments with transverse velocity component. The resistance of the target plate plays an important role in the fragmentation of radial layered PELE. The radial layered PELE produced massive fragments with transverse velocity component when impacting the 45# steel plate with5 mm thickness under the impact velocity of 657.2 m/s.

Interaction of Metal and Slag in Continuous Casting Mold

2015 ◽  
Vol 1125 ◽  
pp. 161-165
Author(s):  
José Dimas Arruda ◽  
Alexandre Leopoldo Pereira ◽  
Carlos Antonio da Silva ◽  
Itavahn Alves da Silva ◽  
Varadarajan Seshadri
Keyword(s):  
Flow Field ◽  
Continuous Casting ◽  
Transverse Velocity ◽  
Longitudinal Velocity ◽  
Casting Machine ◽  
Continuous Casting Mold ◽  
Transient Phenomena ◽  
Transverse Velocity Component ◽  
Piv Technique ◽  
Slab Casting

Knowledge of the flow field inside the mold can offer an opportunity to improve the internal cleanness of the final product. The PIV technique was employed to assess the distribution of longitudinal velocity distribution along a wide section ranging from the submerged nozzle entry to the narrow surface of a mold in a slab casting machine, as well as the distribution of transverse velocity component. This information can be used to assess the degree of interfacial turbulence and also to characterize transient phenomena in the mold.

The limiting behaviour of the turbulent transverse velocity component close to a wall

1970 ◽  
Vol 44 (3) ◽  
pp. 605-614 ◽  
Author(s):  
Kamalesh K. Sirkar ◽  
Thomas J. Hanratty
Keyword(s):  
Distribution Function ◽  
Frequency Response ◽  
Velocity Gradient ◽  
Velocity Component ◽  
Transverse Velocity ◽  
Electrochemical Techniques ◽  
Amplitude Distribution ◽  
Mean Flow ◽  
Transverse Velocity Component ◽  
Limiting Behaviour

Electrochemical techniques are used to measure the circumferential component of the velocity gradient sz at the wall of a pipe through which a turbulent fluid is flowing. The ratio of the root-mean-squared value of sz to the time-averaged velocity gradient is found to be 0·09 or 0·1, depending on whether corrections are made for frequency response. The frequency spectrum is similar to that for the component of the wall velocity gradient in the direction of mean flow. The amplitude distribution function for sz is very roughly approximated by a Gaussian distribution.

Experimental Studies Of The Specific Load Distribution Of The Mixture Over The Area Of The Inclined Tray

2020 ◽  
pp. 78-87
Author(s):  
Mykhailo Piven ◽  
Keyword(s):  
Surface Area ◽  
Load Distribution ◽  
Wheat Variety ◽  
Specific Load ◽  
Mixture Flow ◽  
Load Profile ◽  
Working Surface ◽  
Specific Loading ◽  
Over Time ◽  
Storage Hopper

The regularities of specific loading distribution of loose mixture on the area of a working surface of the inclined tray are established in the work. The studies were performed on the experimental setup consisting of a storage hopper and inclined flat trays of different lengths. The material of the study was a grain mixture of winter wheat variety "Myronivska 30". The magnitude of the load was determined using a receiving device, which allowed to obtain the specific load distribution on the width and length of the tray and over time. The specific loading of the tray is uneven in the area of the working surface: the central section is overloaded, and the wall is underloaded. The largest deviations of the specific load at the inlet of the tray, but with length they decrease, approaching a uniform distribution. The specific load profile across the width of the tray is asymmetric and has a local extremum. As the tray length increases, at the certain initial speed and angle, the specific load decreases and the mixture flow slows down. With a constant supply of material from the hopper, there is a gradual accumulation of the mixture in the tray, compaction and growth of the layer, which leads to complete cessation of flow. Uneven loading of the tray occurs due to uneven supply of material from the storage hopper, in which the movement begins. The initial feed varies across the width of the tray and over time, and the nature of the specific load profile formed at the entrance to the tray is preserved for almost its entire length. The movement of the mixture flow in the inclined tray is non-stationary, the specific load varies significantly over the entire surface area and largely depends on the initial conditions of movement. The obtained regularities of specific loading on the working surface area of the tray can be used in the calculation of the modes of loose mixtures movement and substantiation of the equipment parameters for loading the working bodies of machines.

NUMERICAL STUDY OF THE WAVE INSTABILITY PROBLEM WITH THE EFFECT OF THE TRANSVERSE VELOCITY COMPONENT TEX SYSTEM

2001 ◽  
Vol 09 (03) ◽  
pp. 1055-1065
Author(s):  
B. S. ATTILI
Keyword(s):  
Finite Difference ◽  
Difference Scheme ◽  
Velocity Component ◽  
Finite Difference Scheme ◽  
Numerical Study ◽  
Transverse Velocity ◽  
Numerical Results ◽  
Wave Instability ◽  
Transverse Velocity Component ◽  
Instability Problem

We will numerically investigate the wave instability problem with the effect of the transverse velocity component. An accurate and easy to program finite difference scheme will be developed for this purpose. The eigenfunctions will be normalized and computed simultaneously with the eigenvectors. Numerical results will also be presented.

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