Rodney O. Fox's Computational Models for Turbulent Reacting Flows (Cambridge PDF

By Rodney O. Fox

ISBN-10: 0511077637

ISBN-13: 9780511077630

ISBN-10: 0521650496

ISBN-13: 9780521650496

ISBN-10: 0521659078

ISBN-13: 9780521659079

This survey of the present cutting-edge in computational types for turbulent reacting flows rigorously analyzes the strengths and weaknesses of a few of the options defined. Rodney Fox specializes in the formula of sensible types instead of numerical matters bobbing up from their resolution. He develops a theoretical framework in accordance with the one-point, one-time joint likelihood density functionality (PDF). The learn unearths that every one more often than not hired versions for turbulent reacting flows could be formulated by way of the joint PDF of the chemical species and enthalpy.

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Extra info for Computational Models for Turbulent Reacting Flows (Cambridge Series in Chemical Engineering)

Example text

4 Molecular mixing As seen above, the mean chemical source term is intimately related to the PDF of the concentration fluctuations. In non-premixed flows, the rate of decay of the concentration fluctuations is controlled by the scalar dissipation rate. Thus, a critical part of any model for chemical reacting flows is a description of how molecular diffusion works to damp out concentration fluctuations at the SGS level. 36) = α ∇ 2 φα |φ = φ∗ + Sα (φ∗ ). 33 An example of the time evolution of the conditional scalar Laplacian, corresponding to the scalar PDF in Fig.

Note that, from its definition, Ri j (0, t) = u i u j . Moreover, the twopoint velocity correlation function is the starting point for spectral theories of turbulence as described in the following section. 23) 2k and e1 is the unit vector in the x1 direction. 24) 2 ∂r Ri j (r, t) is completely determined by the longitudinal auto-correlation function f (r, t). The auto-correlation functions can be used to define two characteristic length scales of an isotropic turbulent flow. The longitudinal integral scale is defined by g(r, t) = f (r, t) + ∞ L 11 (t) ≡ f (r, t) dr.

Zwietering 1959; Zwietering 1984). , Fogler 1999). Four examples are shown in Fig. 6. Note that these micromixing models do not contain or use any information about the detailed flow field inside the reactor. The principal weakness of RTD-based micromixing models is the lack of a firm physical basis for determining the exchange parameters. We will discuss this point in greater detail in Chapter 3. Moreover, since RTD-based micromixing models do not predict the spatial distribution of reactants inside the reactor, it is impossible to validate fully the model predictions.

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Computational Models for Turbulent Reacting Flows (Cambridge Series in Chemical Engineering) by Rodney O. Fox


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