Chemical Engineering

Download Applied Mathematics and Modeling for Chemical Engineers by Richard G. Rice PDF

By Richard G. Rice

Bridges the distance among classical research and sleek purposes. Following the bankruptcy at the version development level, it introduces conventional concepts for fixing traditional differential equations, including new fabric on approximate resolution equipment akin to perturbation ideas and easy numerical suggestions. additionally contains analytical easy methods to take care of vital periods of finite-difference equations. The final part discusses numerical answer concepts and partial differential equations.

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6 A plot of the effectiveness factor versus YYlL2- In the limit for small mL2, we can write - - 5 ^ -1 <«»> which is the most effective heat transfer condition. This is physically achieved when (a) The rod thermal conductivity is large. (b) The segment exposed to atmosphere (L2) is short. 64) which is identical to the first model (Eq. 55c). Thus, we have learned that the first model is valid only when mL2

As the level of sophistication increased, the mathematical complexity increased. If one is interested in exactly how heat is conducted through the metal casing and is disposed of to the atmosphere, then the complexity of the problem must be increased by writing down a heat balance relation for the metal casing (taking it to be constant at a value Tw is, of course, a model, albeit the simplest one). Further, if one is interested in how the heat is transported near the entrance section, one must write down heat balance equations before the start of the tube, in addition to the Eq.

We illustrate some of these uncommon types with examples in the next sections. 51) is similar to the first order forced equation (I-factor) discussed earlier, except for the nonlinear term on the right-hand side, yn. 54) hence, the original equation is now linear in v (rhr)s- + p^vl= : Q w (2 55) - which is easily solved using the I-factor method. (^«)2 (259) Inserting this into Eq. 60) which is a linear second order equation with nonconstant coefficients. This may be solved in general by the Frobenius series method, as will be shown in Chapter 3.

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