New PDF release: Computational Gas-Solids Flows and Reacting Systems: Theory,

By Sreekanth Pannala

ISBN-10: 1615206515

ISBN-13: 9781615206513

ISBN-10: 1615206523

ISBN-13: 9781615206520

Gas-solids reactors, which regularly represent severe steps of power and chemical conversion methods, are in determined desire of recent layout how to elevate their potency and reliability, as they're poorly understood and tough to enhance upon.

Computational Gas-Solids Flows and Reacting structures: idea, tools and Practice addresses the necessity for a finished ebook on computational gas-solids circulation to help researchers, graduate scholars, and training engineers during this swiftly increasing region. This special ebook offers a whole exploration of the idea, numerical tools, and practices linked to this rising region, together with hydrodynamic equations, quadrature-based second tools, and direct numerical simulation.

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Additional resources for Computational Gas-Solids Flows and Reacting Systems: Theory, Methods and Practice

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The viscous stresses are represented by σviscous, while the quasi-static and plastic stresses are represented by σplastic. Plastic Regime Syamlal et al. (1993) developed constitutive equations for the plastic regime using Schaeffer’s frictional theory (Schaeffer, 1987). This model is usually called the Schaeffer model in the literature. Benyahia (2008a) has compared this model with the model of Srivastava and Sundaresan (2003). 32) 27 Multiphase Continuum Formulation for Gas-Solids Reacting Flows With this model, we need to specify the critical void fraction below which only plastic stresses are included.

7) where CDm is only a function of the Reynolds number and fluid volume fraction εg. The drag coefficients are usually obtained from experimental correlations, primarily based on two types of experimental data. One type, valid for high values of the solids volume fraction, is the packedbed pressure drop data expressed in the form of a correlation, such as the Ergun (Ergun, 1952) equation. Because the Ergun equation does not have the correct dependence on the Reynolds number in the limit εg → 1 (single-particle limit), it is often supplemented with a drag correlation, such as the Wen and Yu equation, applicable in that limit (D.

1984; Peirano & Leckner, 1998; Sinclair & Jackson, 1989). Kinetic theory provides a framework to systematically derive the continuum representations for the particle positions and velocities. Recent developments in granular kinetic theory are given in two chapters later in the book. Here we only summarize the relevant equations to close the above set of equations. The collisional stress tensor from the kinetic theory can be represented as follows. Although a subscript m is used, the following equations are valid only for a single solids phase.

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Computational Gas-Solids Flows and Reacting Systems: Theory, Methods and Practice by Sreekanth Pannala

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