In practice, however, there are not a few cases that the overall particle size is changed during the reaction unlike the situation assumed in the unreacted shrinking core model. When the density of the converted solid material is different from that of the solid reactant, the particle shrinks ...
On the validity of the shrinking core model in noncatalytic gas solid reaction. Chem. Eng. Sci. 37, 1477-1481.Do, D. D. 1982 On the validity of the shrinking core model in noncatalytic gas-solid reaction. Chem. Eng. ScL 37,1477-1481....
A heterogeneous reaction model is developed to represent the gas–solid reaction consisting of two-step reactions: formation of a solid intermediate on the core of unreacted solid and consumption of the solid intermediate. The presented model takes into account the shrinkage of both the unreacted cor...
Shrinking core modelInorganic solid state synthesis with phosphorus and tellurium require a careful control of the reaction parameters because of the high volatility of the components. This initial disadvantage can be used as a benefit for investigation of phase formation mechanism by analyzing the ...
On the basis of this assumption, a gastransfer control-shrinking core model (GTC-SCM) equation is formulated which, along with the segregated flow model, helps to calculate the conversion of the solid phase. The size distribution of the particles at the exit of the reactor is computedvia a ...
A simple expression for the apparent reaction rate of large wood char gasification with steam In the middle stage, the particle shrinks following the shrinking core model without change in the local conversion ratio. In the final stage, the local... K Umeki,SA Roh,TJ Min,... - 《Bioresour...
Based on the single-phase gas transfer theory in nanopores, we established a gas transport model in both circular pores and slit pores by considering pore-fracture patterns of actual samples. As will be shown, inorganic pore fractures are mostly slit-type, while organic pores are mostly circular...
The equations shown are derived using a Shrinking Core Model (SCM) with sphere-like geometry, which is the one correspondent to the nickel catalyst that we are considering in this study. The term Cneq considers the thermodynamic equilibrium in the reactant gas when nickel is used as an oxygen...
(kg) solid fuel particle mass (kg) initial particle mass (kg) volatile yield up to time t (kg) gas pressure (Pa) heat Exchange between different phases (J) reaction rates for eddy dissipation combustion model Reynolds number Nusselt number universal gas constant (J kmol?1 K?1) reaction ...
and solid phases may not be the rate limiting factor in the high- gravity carbonation system. In addition, the reaction mechanisms and kinetics of carbonation in an RPB have been studied using shrinking core model [11] and surface coverage model [17], which indicate that the filmdiffusion ...