scholarly journals Compression mechanism in multilayered filter cakes

2021 ◽  
Author(s):  
Martin Hennemann ◽  
Ehsan Fattahi ◽  
Martina Gastl ◽  
Thomas Becker
Keyword(s):  
Compression Mechanism ◽  
Filter Cakes

The Porosity, Permeability and Restructuring of Heterogeneous Filter Cakes

2010 ◽  
Vol 33 (8) ◽  
pp. 1283-1289 ◽  
Author(s):  
K. Chellappah ◽  
E. S. Tarleton ◽  
R. J. Wakeman
Keyword(s):  
Filter Cakes

Design and experimental validation of a cam-based constant-force compression mechanism with friction considered

2018 ◽  
Vol 233 (11) ◽  
pp. 3873-3887 ◽  
Author(s):  
Ming Li ◽  
Wei Cheng ◽  
Ruili Xie
Keyword(s):  
Design Theory ◽  
High Efficiency ◽  
Rolling Friction ◽  
Constant Force ◽  
Identification Method ◽  
Compression Mechanism ◽  
Engineering Significance ◽  
Nonlinear Vibration Control ◽  
Preparatory Work ◽  
Differential Relationship

Due to the quasi-zero-stiffness and overload protection characteristics, constant-force mechanisms can be widely used in nonlinear vibration control, high-efficiency shock isolation, and other engineering fields. As a preparatory work for the further applications, this paper presents a cam-based constant-force compression mechanism and validates the quasi-static characteristics experimentally. By employing the friction considered profile identification method to design the cam and through the interaction between the cam and spring-sliders, the constant-force compression mechanism can passively output the desired constant force over a sufficiently large displacement. The design theory is firstly introduced in detail. Through establishing and solving the differential relationship between the lateral elastic force and vertical constant force, the constant-force compression mechanism under various frictional conditions can be designed. Then, constant-force compression mechanism prototypes corresponding to sliding and rolling friction are designed, fabricated and tested respectively. The results show that both the prototypes have the satisfactory characteristics as with the design requirements. Moreover, the relative generality and stronger engineering applicability of the proposed friction considered profile identification method are proved since it can not only cover the frictionless (micro-friction) cases, but keep the constant-force behavior of the constant-force compression mechanism under the nonignorable friction conditions. Therefore, compared with the existing cam-roller constant-force mechanisms that must ensure the ignoring micro-friction demand, the presented constant-force compression mechanism taking friction into consideration has important engineering significance since it can reduce this machining requirement.

scholarly journals The Influence of Surface Energy on the Washing Quality of Filter Cakes

2011 ◽  
Vol 01 (04) ◽  
pp. 252-255 ◽  
Author(s):  
Markus Wilkens ◽  
Urs A. Peuker
Keyword(s):  
Surface Energy ◽  
Filter Cakes

Systematic ab initio study of the compressibility of silicate garnets

2001 ◽  
Vol 57 (2) ◽  
pp. 163-177 ◽  
Author(s):  
V. Milman ◽  
E. V. Akhmatskaya ◽  
R. H. Nobes ◽  
B. Winkler ◽  
C. J. Pickard ◽  
...  
Keyword(s):  
Experimental Data ◽  
Density Functional ◽  
Structural Parameters ◽  
Applied Pressure ◽  
Basis Set ◽  
Ionic Radii ◽  
Cell Parameters ◽  
The Density Functional Theory ◽  
Dodecahedral Site ◽  
Compression Mechanism

The structural properties of the silicate garnets andradite, Ca3Fe2Si3O12, uvarovite, Ca3Cr2Si3O12, knorringite, Mg3Cr2Si3O12, goldmanite, Ca3V2Si3O12, blythite, Mn^{2+}_3Mn^{3+}_2Si3O12, skiagite, Fe^{2+}_3Fe^{3+}_2Si3O12, calderite, Mn^{2+}_3Fe^{3+}_2Si3O12, and khoharite, Mg3Fe^{3+}_2Si3O12, have been investigated with a quantum-mechanical model as a function of applied pressure. The study has been performed with the density functional theory code CASTEP, which uses pseudopotentials and a plane-wave basis set. All structural parameters have been optimized. The calculated static geometries (cell parameters, internal coordinates of atoms and bond lengths), bulk moduli and their pressure derivatives are in good agreement with the experimental data available. Predictions are made for those cases where no experimental data have been reported. The data clearly indicate that the elastic properties of all silicate garnets are dominated by the compressibility of the dodecahedral site. The compression mechanism is found to be based on a bending of the angle between the centers of the SiO4 tetrahedra and the adjacent octahedra, as in the aluminosilicate garnets. An analysis of the relationship between ionic radii of the cations and the compressibility of silicate garnets is presented.

The compression mechanism of powders

1996 ◽  
Vol 56 (1-4) ◽  
pp. 581-588 ◽  
Author(s):  
T. Kennedy ◽  
Y. Yaginuma ◽  
S. Hampshire
Keyword(s):  
Compression Mechanism

Zusammensetzung des Filterkuchens an Schlitzwandlamellen mit kurzer und langer Standzeit/Composition of filter cakes arising during slurry wall construction depending on duration of suspension supported period

Bauingenieur ◽  
2015 ◽  
Vol 90 (02) ◽  
pp. 63-70
Author(s):  
Diethard König ◽  
Thomas Schröder
Keyword(s):  
Slurry Wall ◽  
Wall Construction ◽  
Filter Cakes

Bei der Herstellung von Schlitzwänden im Zweiphasenverfahren ergeben sich aus baubetrieblichen Gründen immer wieder Situationen, in denen Schlitze suspensionsgestützt lange stehen bleiben, bevor mit dem Betoniervorgang begonnen werden kann. Es herrscht die Vorstellung, dass sich mit zunehmender Standzeit unter Flüssigkeitsstützung der Filterkuchen an der Schlitzwandung, welcher später zwischen der fertig betonierten Wand und dem Boden verbleibt, verstärkt ausbildet und reibungsmindernde Eigenschaften hat. Aus dieser Annahme heraus wird in den Regelwerken verlangt, dass der Wandreibungswinkel für die statische Berechnung der Schlitzwand bei planmäßig langen Standzeiten des suspensionsgestützten Schlitzes von mehr als 30 Stunden mit k = 0 anzusetzen ist. Bleibt die Standzeit des suspensionsgestützten Schlitzes dagegen unter 30 Stunden, ist je nach Beschaffenheit des Bodens ein Ansatz des Wandreibungswinkels ohne weiteren Nachweis von bis zu k = ½ ‘k möglich.   In diesem Beitrag werden Untersuchungen an Filterkuchenmaterial vorgestellt, das bei einer laufenden Baumaßnahme an zwei Schlitzwandlamellen gewonnen wurde. Diese Lamellen unterscheiden sich bei sonst gleichen Randbedingungen durch unterschiedlich lange Standzeiten des suspensionsgestützten Schlitzes (16 Stunden, 70 Stunden). Die Untersuchungen zeigen, dass sich bei den anstehenden Verhältnissen infolge der längeren Standzeit keine signifikanten Änderungen in der Ausbildung und in der Zusammensetzung des Filterkuchens ergeben.

Computation of Pressure Loads in the Three-Lobe Supercharger

1998 ◽  
Author(s):  
Giovanni C. Mimmi ◽  
Paolo E. Pennacchi
Keyword(s):  
Compression Mechanism

Abstract The compression mechanism in this type of blower is produced by the action of two three-lobe rotors. In this paper the functioning of this kind of blower is analyzed in detail for both the helical and spur rotor types. The analysis allows us to point out specific problems regarding trapped volumes and to design special devices to avoid these problems. The complete dynamics of the loads is determined on this basis, and the performances achieved by helical and spur rotors are compared.

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