Slurry density 312 INDEX

A coal slurry is to be transported by pipeline. It has been determined that the slurry may be described by the power law model, with a flow index of 0.4, an apparent viscosity of 50 cP at a shear rate of 100 s-1, and a density of 90 lbm/ft3. What horsepower would be required to pump the slurry at a rate of 900 gpm through an 8 in. sch 40 pipe that is 50 mi long ... 

For a properly designed and operated cyclone, the sharpness index is constant, typically 0.6. The cut size and apparent bypass are a function of the cyclone geometry, the volumetric feed rate, the material relative density, the feed solids concentration, and the slurry rheology. The relationship for a standard cyclone geometry, where if D. is the cylinder diameter in cm and inlet area = 0.05 D vortex finder diameter = 0.35 Dc ... 

Monitoring and control of CMP slurry properties is essential for effective and uniform CMP processes. Bench-top blend sensitivity analysis helps in identification of the most sensitive blend monitoring and control parameter. Two- and three-component blends of CMP slurries can be created and monitored based on the measurements of density, wt% solids, refractive index, pH, and oxidizer level. Typical silica oxide slurry blend ratio is controlled using density as a control parameter, whereas tungsten and copper CMP slurries usually need an autotitrator for periodic monitoring of the oxidizer level. 

A coal-in-oil slurry which behaves as a power-law fluid is to be heated in a double-pipe heat exchanger with steam condensing on the annulus side. The inlet and outlet bulk temperatures of the slurry are 291 K and 308 K respectively. The heating section (inner copper tube of 40 mm inside diameter) is 3 m long and is preceded by a section sufficiently long for the velocity profile to be fully estabhshed. The flow rate of the slurry is 400kg/h and its thermo-physical properties are as follows density = 900 kg/m heat capacity = 2800 J/kg K thermal conductivity = 0.75 W/mK. In the temperature interval 293 < T < 368 K, the flow behaviour index is nearly constant and is equal to 0.52. 

A slurry exhibiting power-law flow behaviour is flowing through 15 m of pipe having an inside diameter of 5 cm at an average velocity of 0.07 m /s. The density of the slurry is 1050 kg/m and its flow index and consistency index are n = 0.4 and k = 13.4Ns° /m, respectively. Calculate the pressure drop in the pipeline. 

Before sample preparation the sample should be thoroughly blended. In the case of grains and powdered substances, liquids, and slurries, this reduces the possibility of stratification of the material, which can be a serious source of error. Stratification can occur in liquids due to differences in temperature, refractive index, composition, density, and other factors. Blending of forages means ensuring that the correct proportion of leaves to stems is maintained, and that the sample submitted... 

---