Read e-book online Applied Mathematics and Modeling for Chemical Engineers PDF

By Richard G. Rice

ISBN-10: 0471303771

ISBN-13: 9780471303770

Bridges the space among classical research and sleek purposes. Following the bankruptcy at the version development level, it introduces conventional thoughts for fixing usual differential equations, including new fabric on approximate resolution equipment comparable to perturbation concepts and simple numerical suggestions. additionally comprises analytical tips on how to care for very important sessions of finite-difference equations. The final part discusses numerical resolution concepts and partial differential equations.

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When dealing with simple equations (as in the previous three models), the dimensional equations are solved without recourse to the process of nondimensionalisation. Now, we must deal with partial differential equations, and to simplify the notation during the analysis and also to deduce the proper dimensionless parameters, it is necessary to reduce the equations to nondimensional form. To achieve this, we introduce the following nondimensional variables and parameters: rri A= (TT)' rwi Bi== nr (Biot n u m b e r ) (1Mb) where it is clear that only two dimensionless parameters arise: A and Bi.

You may note the difference between the solution obtained by the level 2 model and that obtained in the third level. Because of the allowance for temperature gradients (which represents the rod's resistance to heat flow) in the segment underneath the solvent surface, the rate of heat transfer calculated at this new level is less than that calculated by the level two model where the rod temperature was taken to be uniform at T1 below the liquid surface. This implies from Eq. 78) is satisfied, the rate of heat transfer given by Model 2 is valid.

In particular, one can derive criteria (like Eq. 91) to show when the simpler models are valid. Some solutions for the simpler models can be found in Walas (1991). The obvious question arises: When is a model of a process good enough? This is not a trivial question, and it can only be answered fully when the detailed economics of design and practicality are taken into account. Here, we have simply illustrated the hierarchy of one simple process, and how to find the limits of validity of each more complicated model in the hierarchy.

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


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