Differential pressure flow meter is a kind of very promising flow measuring instrument, the application range is very wide. But aiming at the defects that the mechanical structure of all kinds of existing flow meters is complex, the throttling way disturbs the fluid greatly and the stability of differential pressure signal is insufficient, a kind of new inside and outside tube differential pressure flow meter was designed.
Using the first principles calculation method calculated the Mg substitutional atoms occupying law in LaNi3alloy. The results of total energy showed ,when Mg atoms occupy the bit of 6c,LaNi3alloy is more stable. And substitutional atoms tend to non adjacent. The result of size effect and electronic structure showed that ,the size effect is a major determinant of substitutional Mg substitutional atoms.
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