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Models Based on the Core-Annular Flow Structure

2 Models Based on the Core-Annular Flow Structure [Pg.448]

Considering an element of dz in the riser, the mass balance of the solids in the core region gives [Pg.449]

On the other hand, in terms of the mass balance across a cross section of the riser, the upward solids flow rate We can also be evaluated from [Pg.450]

Equation (10.30) implies that the particle downward flow rate along the wall decays exponentially with the bed height. The deposition coefficient, kd, can be related to the amplitude of the gas velocity fluctuations as [Pemberton and Davidson, 1986 Bolton and Davidson, 1988] (Problem 10.8) [Pg.450]

Once We and Ww are known, the cross-sectional averaged solids holdup, ap, can be calculated by using the following equation [Pg.450]


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Annular

Annular flow

Annular structures

Base flow

Core model

Core-annular flow

Core-annular flow model

Flow structures

Model based on structure

Model structure-based

On-flow

Structured flows

The core

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