Solid compressive pressure

The drag that is imposed on each particle is transmitted to adjacent particles. Therefore, the net solid compressive pressure increases as the filter plate is approached, resulting in a decrease in porosity. Referring to Figure 4A, it may be... 

Lu W.M., Huang Y.P. and Hwang K.J., 1998b. Methods to determine the relationship between cake properties and solid compressive pressure, Separ. Purif. Tecfmol., 13, 9-23. 

Fouling layers, in general, are compressible, that is they become more compact as the extent of their compression increases. Solid compressive pressure is responsible for the compression of a fouling layer according to basic filtration theory [46]. In traditional filtration theory, the derivation of the drag equations of filtration for rigid particle slurries assume that particles are in point contact mode and that compression attends instantaneously. Under this assumption, a force balance can be obtained between liquid pressure over the entire cross-section and the solid compressive pressure on the total mass within the porous layer as ... 

Figure 15.10 Porosity as a function of solid compressive pressure in the fouling layer formed in the dead-end microfiltration under AP — 6 kPa for 0.5% cross-linked S. cerevisiae suspension.

The hydrostatic pressure varies from a maximum at the point where suspension enters the cake, to zero where liquid is expelled from the medium consequently, at any point in the cake the two are complementary. That is, the sum of the hydrostatic and compression pressures on the solids always equals the total hydrostatic pressure at the face of the cake. Thus, the compression pressure acting on the solids varies from zero at the face of the cake to a maximum at the filter medium. 

That the compressibility is constant over the entire pressure range. In fact, solid compressibilities are slightly nonlinear, decreasing with increasing pressure. 

Figure 8.20 Sequence of the preparation of a Langmuir-Btoggett film on water (a) before compression, (b) during compression, (c) at limiting pressure, (d) film collapse at higher pressure. Right Pres sure-surface diagram showing the phase changes L (gas-liquid) and S (liquid-solid). it, pressure and A surface area...

Fig. 5.6. Flow and compression properties of feed solids for theoretical roll press design [15]. (a) Shear cell to measure internal friction of granular solid, (b) Cell to measure angle of friction between roll face and granular solid, (c) Pressure-density relationship of feed material.

Compression Pressure is applied to form the granule into a solid (Figure 4b) ... 

Boyle s law (L oc 1/P). A change in gas pressure in one direction causes a change in gas volume in the other. What happens to the particles when external pressure compresses the gas volume And why aren t liquids and solids compressible ... 

Pumping, Compression, Pressure Reduction, Vacuum, and Conveying of Solids 185... 

Under these conditions, a compressive pressure is exerted between the two particles due to the capillary pressure and the surface tension of the liquid. (See Section 14.2.) Because of this compressive pressure at the contact area, the chemical potential of atoms at the contact area is higher than elsewhere (i.e. at the surface of the neck region). Therefore, the solid at the contact area dissolves and the dissolved material is transported to the surface of the neck. As a result of this material transport, the contact area increases and the grain shape is accommodated (contact flattening). At the same time, the pore shrinks continuously and the compact is densified. Kingery considered the pressure... 

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