ABSTRACT
For ¡ow problems in which an exact solution is not known, it may be possible to obtain an approximate solution. By an approximate solution we mean an analytic expression that approximately satis‡es the full viscous ¡ow equations rather than a numerical approximation to these equations. In this chapter, the full governing equations will be approximated for ¡ows involving low Reynolds numbers, and some exact solutions to the resulting equations will be established.
