Читать книгу The Mathematics of Fluid Flow Through Porous Media - Myron B. Allen III - Страница 19

The partial differential equations (PDEs) governing flows through porous media arise from balance laws. All of the flows treated in this book are isothermal, that is, the temperature is constant in time and uniform in space. With this assumption in place, we need only work with the balance laws governing mass and momentum—with one exception noted below.

Figure 2.5 A time‐independent region having oriented boundary and unit outward normal vector field . The small arrows represent the spatial velocity.