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在物理教学中,将会遇到有关运动流体,即气流或液流与固体发生相互作用的问题.其特点是流体的质量属动态连续分布,且与固体直接作用的流体将不断更替.对于这类力学问题的解答,很多学生感到一筹莫展.若能引导学生巧用“微元法”,就能使这类疑难问题迎刃而解.
In physics teaching, we will encounter problems related to the movement of fluids, that is, the interaction of gas flow or liquid flow with solids. It is characterized by the fact that the mass of the fluid is dynamically continuous and that the fluid directly interacting with the solid will be continuously replaced. Many students feel overwhelmed by the answers to the problems of mechanics. If they can guide students to use the “microelement method” skillfully, this kind of problem can be easily solved.