Instantaneous suspension density

A capacitance probe was developed in our work (Brereton and Grace, 1992) based upon a DISA capacitative pressure transducer system. It effectively measures the instantaneous suspension density in an approximately 5 mm cubic zone surrounding the exposed needle. The capacitance probe was used to study radial variations and the form of solids flow structures present in the developing region of a cold circulating bed. Sand particles with a mean diameter... 

Measurements of local instantaneous velocity, density, and mass flow of phases of a gas-solid suspension are needed in determining transport properties, validating theoretical predictions, and formulating design procedures. 

Figure 4 Examples of heat transfer probes, (a) Low thermal capacity instantaneous type of Mickley et al. (1961) (b) miniature heat transfer probe of Ma and Zhu (1999) (c) probe to measure radiative and total heat flux. (Luan et al., 1999.) (d) radiative heat flux vs. suspension density. (Luan et al. 1999.) [(a) Reproduced with permission of the American Institute of Chemical Engineers. Copyright 1986 AIChE. All right reserved, (b)-(d) with permission of Elsevier Science]...

Figure 19. Variation of the instantaneous local heat transfer coefficient and the point voidage with time on the wall of the cold model circulating fluidised bed combustor. The signals are seen to be strongly cross-correlated. The cross sectionally area averaged suspension densities are from top to bottom, 46.7 kg/m3, 32.0 kg/m3,15.3 kg/m3, (Wu et al, 1991).

Gap distance along line of centers of identical spheres Height of suspension layer Instantaneous height of free surface of liquid in capillary tube Equilibrium height of free surface of liquid in capillary tube Limiting current density Current density, Eq. (2.5.8)... 

Continuous Starch Hydrolysis. A commercial continuous converter installation for dextrose manufacture employing a continuous, automatically controlled step for the hydrolysis of starch is now in operation. A flow diagram of a modem commercial installation for continuous starch hydrolysis is shown in Fig. 13-4. The starch converter consists of an 8-in. coil, 677 ft long, which is fed by a high-pressure centrifugal pump from a continuous starch make-up tank equipped for automatic control of density (Baumd), level, and acidity. The level controller regulates the addition of 20 B starch suspension, the Baum controller operates the water valve, and a conductivity instrument controls the addition of acid. The head end of the converter coil has an entry chamber to separate non-condensables, and the feed is instantaneously heated with live steam through a jet heater. 

Sedimentation (MICROSCOPIC PROCESS) motion of particles in viscous media due to gravitation or centrifugal fields (also settling), the term refers frequently to the state in which the field forces are counterbalanced by the drag force this state is almost instantaneously achieved in the case of colloidal suspensions the sedimentation of an individual particle depends on its size, the density contrast, the rheological fluid properties, the field strength, and the viscous interactions with other particles. 

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