This paper discusses similarity criterion in similarity theory, and how to derivate similarity criterion of mathematics simulation model by dimensional analysis. A example for this method is given.
讨论了相似理论中的相似准则，以及如何用因次分析法推导数学仿真模型中的相似准则，并举例说明了这种方法的实用性。
The similarity method of mass flow, as it is called in this paper, is different from the methods of equational analysis and the dimensional analysis.
提出的所谓质流相似法，不同于传质相似理论中方程分析法和量纲分析法。
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