25 Summary

Governing equations describing the flow processes of continuous fluid are well established. These equations form the basis for further understanding and further attempts at modeling complex flow processes. In order to close the set of equations, it is necessary to provide appropriate constitutive equations, equations to estimate and represent the variation in properties of the fluids under consideration and the correct boundary conditions. The importance of boundary conditions cannot be overemphasized. Dimensional and order-of-magnitude analysis is often helpful in identifying important features of the flow process and may highlight possible simplifications. Even the simplest flow models may require numerical solutions. Typical flow processes relevant to reactor engineering are usually governed by strongly coupled, non-linear equations. Details of complexities arising due to these non-linearities, and numerical methods for solving these model equations are discussed in subsequent chapters of this part.

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