Experiment Solution Velocity and Pressure Field in the Mixing Process Computer Simulation

2014 ◽  
Vol 693 ◽  
pp. 68-73
Author(s):  
Helena Kravarikova
Keyword(s):  
Rotation Axis ◽  
Flow Density ◽  
Geometrical Shape ◽  
Technical Equipment ◽  
Mixing Process ◽  
Rotational Movement ◽  
Complex Process ◽  
Axis Of Symmetry ◽  
Process Computer ◽  
Solution Velocity

The process of mixing materials is a very complex process. The mixing process is used for homogenisation of substances. Rather than propose a real mixer, you must first construct a mixer for operational purposes experimental solutions. Experimental solutions are most often realized in laboratory conditions. Experimental mixers are made according to the requirements of power mixers, fluid flow, density and viscosity of the mixed fluid. To investigate the mixing process in the Laboratory mixers are made on the basis of the criteria of non-dimensional simplex. For designing operating mixers can also use analytical solutions of technical equipment and the mixing process. It is now possible to implement solutions using FEM numerical simulation of this phenomenon.The homogeneity of the mixed substances, mixer performs rotational movement about the axis of rotation. In most cases, the rotational movement of the stirrer describes the geometrical shape of the mixer. Usually rotation axis Mixer is the axis of symmetry. The shape and dimensions of the stirrer depends on the desired performance of mixer, the type of flow, the type and quantity of mixed materials.

scholarly journals Crystal structure of {2-[({2-[(2-aminoethyl)amino]ethyl}imino)methyl]-6-hydroxyphenolato-κ4N,N′,N′′,O1}(nitrato-κO)copper(II) ethanol 0.25-solvate

2015 ◽  
Vol 71 (11) ◽  
pp. m205-m206 ◽  
Author(s):  
Shabana Noor ◽  
Sarvendra Kumar ◽  
Suhail Sabir ◽  
Rüdiger W. Seidel ◽  
Richard Goddard
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Schiff Base Ligand ◽  
Rotation Axis ◽  
Solvent Molecule ◽  
Nitrate Anion ◽  
Complex Molecules ◽  
Pyramidal Configuration ◽  
Axis Of Symmetry

In the crystal structure of the title mononuclear CuIIcomplex, [Cu(C11H16N3O2)(NO3)]·0.25C2H5OH, the complex molecules are linked by N—H...O and O—H...O hydrogen bonds, forming a dimer with an approximate non-crystallographic twofold rotation axis of symmetry. In the monomeric unit, the Cu2+ion exhibits a distorted square-pyramidal configuration, whereby the anionic [HL]−Schiff base ligand binds in a tetradentate fashionviathe O and the three N atoms which all are approximately coplanar. The O atom of a nitrate anion occupies the fifth coordination site, causing the CuIIatom to move slightly out of the approximate basal plane toward the bound nitrate group. The structure exhibits disorder of the ethanol solvent molecule.

scholarly journals Development of a Mixing Process Using an HB-Type Impeller to Easily Achieve Scale-Up by Maintaining Geometrical Similarity

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yoshihito Kato ◽  
Haruki Furukawa ◽  
Yasuyuki Ikeda ◽  
Toshikazu Nakanishi ◽  
Tadashi Sano ◽  
...  
Keyword(s):  
Scale Up ◽  
Scaling Up ◽  
Laboratory Scale ◽  
Industrial Scale ◽  
Geometrical Shape ◽  
Line Pattern ◽  
Mixing Process ◽  
Home Base ◽  
Mixing Performance ◽  
Better Than

In recent years, a novel home base-type (HB-type) impeller was developed to be based on observation of the streak line pattern. An HB impeller must be simple, speedy, and stable (3S). When an HB impeller is used on the laboratory beaker scale, the mixing performance of the HB impeller is better than that of a normal cylindrical stirring bar. In addition, an industrial-scale HB impeller has been constructed based on the observation of the streak line and isolated mixing regions in the vessel. The present authors believe that scale-up of the mixing process is very easy because the geometrical shape of the impeller can be kept consistent when scaling up from the laboratory scale to the industrial scale.

scholarly journals Effect of the forces of one-way magnetic attraction on the reliability of the bearing unit of the traction switched reluctance motor

2021 ◽  
Vol 2131 (4) ◽  
pp. 042078
Author(s):  
Y Y Miroshnichenko
Keyword(s):  
Rotation Axis ◽  
Switched Reluctance Motor ◽  
Air Gap ◽  
Switched Reluctance ◽  
Design Elements ◽  
Magnetic Attraction ◽  
Axis Of Rotation ◽  
First Case ◽  
Reluctance Motor ◽  
Axis Of Symmetry

Abstract The subject of the research is a traction switched reluctance motor with an uneven air gap. The main purpose of the work is to determine the forces of one-way magnetic attraction, evaluate and analyze these forces, develop measures to reduce the forces to an acceptable value. In the article, the forces of disbalancement and the forces of one-way magnetic attraction are considered in the relationship. The finite element method was used to determine the main parameters of the switched reluctance motor. The studies were carried out for two idealized variants of the location of the rotor rotation axis. In the first case, the axis of rotation is combined with the axis of symmetry of the stator. The second option considers the case of displacement of the axis of rotation together with the axis of symmetry of the rotor. It is determined that the resulting force of one-way magnetic attraction with an uneven air gap reaches significant values and significantly exceeds the permissible values. An algorithm for calculating the characteristics of a switched reluctance motor is proposed, which takes into account the tolerances for the manufacture of its design elements. The algorithm allows you to adjust the requirements for the bearings used, ensure the required level of reliability of the traction switched reluctance motor (SRM) and predict the level of vibration and noise.

scholarly journals Conceptual Model of Measuring MHEI Efficiency

2020 ◽  
Vol 10 (12) ◽  
pp. 385
Author(s):  
Ana Gundić ◽  
Dino Županović ◽  
Luka Grbić ◽  
Mate Baric
Keyword(s):  
Higher Education ◽  
Conceptual Model ◽  
Education System ◽  
Evaluation Criteria ◽  
Technical Equipment ◽  
Non Profit ◽  
Higher Education Systems ◽  
Complex Process ◽  
Educational Efficiency ◽  
Measuring Efficiency

Modern societies, new technical equipment and technology confirm the importance of knowledge acquisition in everyday life, especially in economy. An education system is a non-profit system. Since it strongly affects economic efficiency, its quantification becomes a very complex process. In order to make the quantification process possible, this paper analyses the already existing criteria for measuring efficiency in higher education systems. The already existing models of measuring educational efficiency are universal and do not analyse different professions’ specific qualities. In this paper, models of measuring educational efficiency were analysed separately, whereas their interrelations were not a part of the analysis. A conceptual model of measuring maritime higher education institutions’ (hereinafter: MHEI) efficiency was proposed on the basis of the above-mentioned analysis. All the evaluation criteria relevant for MHEI and their interrelations were determined.

Fluid instabilities in precessing spheroidal cavities

2001 ◽  
Vol 447 ◽  
pp. 111-128 ◽  
Author(s):  
S. LORENZANI ◽  
A. TILGNER
Keyword(s):  
Rotation Axis ◽  
Inviscid Fluid ◽  
Real Fluid ◽  
Fluid Instabilities ◽  
Ekman Layers ◽  
Ellipsoid Of Revolution ◽  
Precessional Motion ◽  
Average Rotation ◽  
Axis Of Symmetry ◽  
Axisymmetric Shear

We study by direct numerical simulation the motion of incompressible fluid contained in an ellipsoid of revolution with ellipticity 0.1 or less which rotates about its axis of symmetry and whose rotation axis is executing precessional motion. A solution to this problem for an inviscid fluid given by Poincaré (1910) predicts motion of uniform vorticity. The simulations show how the orientation of the average vorticity of a real fluid is influenced by both pressure and viscous torques exerted by the boundaries. Axisymmetric shear layers appear which agree well with those observed experimentally by Malkus (1968). Shear caused by deviations from a velocity field with uniform vorticity triggers an instability consisting of waves propagating around the average rotation axis of the fluid. The Ekman layers at the boundaries may also become unstable.

Geometry of the T-Even Bacteriophage Head

1972 ◽  
Vol 30 ◽  
pp. 202-203
Author(s):  
C. N. Gordon
Keyword(s):  
Icosahedral Symmetry ◽  
Geometrical Shape ◽  
Middle Section ◽  
Head Shape ◽  
Protein Subunits ◽  
Complex Process ◽  
Phage Dna ◽  
Head Assembly

The T-even bacteriophage head is a non-isometric structure composed of more than one kind of protein. The head is assembled in a complex process which involves several products of the phage DNA, and probably the participation of the DNA itself. Two problems which are as yet unsolved are the manner in which the protein subunits are arranged in the mature phage head and the mechanism of head assembly.There are two conflicting theories regarding the geometrical shape of the head: Moody and Boy de la Tour and Kellenberger consider the head shape to be a bipyramidal pentagonal, antiprism (“prolate icosahedron“); this structure can be thought of as being derived from a head with regular icosahedral symmetry by lengthwise extension of the middle section.

scholarly journals Orientation of non-spherical particles in an axisymmetric random flow

2013 ◽  
Vol 719 ◽  
pp. 465-487 ◽  
Author(s):  
Dario Vincenzi
Keyword(s):  
Spherical Particles ◽  
Geometrical Shape ◽  
Stationary Probability ◽  
Rigid Particles ◽  
Stationary Probability Density Function ◽  
Random Flow ◽  
Axis Of Symmetry ◽  
Tumbling Motion ◽  
Preferential Alignment ◽  
Jeffery’S Equation

AbstractThe dynamics of non-spherical rigid particles immersed in an axisymmetric random flow is studied analytically. The motion of the particles is described by Jeffery’s equation; the random flow is Gaussian and has short correlation time. The stationary probability density function of orientations is calculated exactly. Four regimes are identified depending on the statistical anisotropy of the flow and on the geometrical shape of the particle. If $\boldsymbol{\lambda} $ is the axis of symmetry of the flow, the four regimes are: rotation about $\boldsymbol{\lambda} $, tumbling motion between $\boldsymbol{\lambda} $ and $- \boldsymbol{\lambda} $, combination of rotation and tumbling, and preferential alignment with a direction oblique to $\boldsymbol{\lambda} $.

The Sun as a Magnetic Star

1976 ◽  
Vol 32 ◽  
pp. 457-463
Author(s):  
John M. Wilcox ◽  
Leif Svalgaard
Keyword(s):  
Recent Work ◽  
Rotation Axis ◽  
Polar Field ◽  
Magnetic Star ◽  
Rotational Axis ◽  
Field Variation ◽  
The Sun ◽  
Arbitrary Angle ◽  
Solar Magnetism ◽  
Oblique Rotator

SummaryThe sun as a magnetic star is described on the basis of recent work on solar magnetism. Observations at an arbitrary angle to the rotation axis would show a 22-year polar field variation and a 25-day equatorial sector variation. The sector variation would be similar to an oblique rotator with an angle of 90° between the magnetic and rotational axis.

ultrastructural process of intestinal wound healing

1995 ◽  
Vol 53 ◽  
pp. 1024-1025
Author(s):  
Rick L. Vaughn ◽  
Shailendra K. Saxena ◽  
John G. Sharp
Keyword(s):  
Wound Healing ◽  
Epithelial Cells ◽  
Smooth Muscles ◽  
Microscopic Level ◽  
Light Microscopic Level ◽  
Ileal Mucosa ◽  
Wound Model ◽  
Serosal Surface ◽  
Complex Process ◽  
Orderly Fashion

We have developed an intestinal wound model that includes surgical construction of an ileo-cecal patch to study the complex process of intestinal wound healing. This allows approximation of ileal mucosa to the cecal serosa and facilitates regeneration of ileal mucosa onto the serosal surface of the cecum. The regeneration of ileal mucosa can then be evaluated at different times. The wound model also allows us to determine the rate of intestinal regeneration for a known size of intestinal wound and can be compared in different situations (e.g. with and without EGF and Peyer’s patches).At the light microscopic level it appeared that epithelial cells involved in regeneration of ileal mucosa originated from the enlarged crypts adjacent to the intestinal wound and migrated in an orderly fashion onto the serosal surface of the cecum. The migrating epithelial cells later formed crypts and villi by the process of invagination and evagination respectively. There were also signs of proliferation of smooth muscles underneath the migratory epithelial cells.

Σ =13 tilt grain boundary in silicon bicrystal

1990 ◽  
Vol 48 (4) ◽  
pp. 562-563
Author(s):  
M.J. Kim ◽  
Y.L. Chen ◽  
R.W. Carpenter ◽  
J.C. Barry ◽  
G.H. Schwuttke
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Rotation Axis ◽  
Czochralski Method ◽  
High Resolution Electron Microscopy ◽  
Image Simulation ◽  
Simulation Techniques ◽  
Resolution Electron ◽  
The Common ◽  
Tilt Grain Boundary

The structure of grain boundaries (GBs) in metals, semiconductors and ceramics is of considerable interest because of their influence on physical properties. Progress in understanding the structure of grain boundaries at the atomic level has been made by high resolution electron microscopy (HREM) . In the present study, a Σ=13, (510) <001>-tilt grain boundary in silicon was characterized by HREM in conjunction with digital image processing and computer image simulation techniques.The bicrystals were grown from the melt by the Czochralski method, using preoriented seeds. Specimens for TEM observations were cut from the bicrystals perpendicular to the common rotation axis of pure tilt grain boundary, and were mechanically dimpled and then ion-milled to electron transparency. The degree of misorientation between the common <001> axis of the bicrystal was measured by CBED in a Philips EM 400ST/FEG: it was found to be less than 1 mrad. HREM was performed at 200 kV in an ISI-002B and at 400 kv in a JEM-4000EX.

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