Foaming method for measuring holes

Common materials such as ceramics and porous metal filter having a pore distribution range of generally suitable for measuring pores in the range of just a few tenths of microns to several tens microns, bubble method, is currently the most used in the measurement of all large Both theoretically and experimentally mature.

The basic principle of the bubble method is: for a porous sample previously infiltrated with a liquid, the liquid in the hole is discharged by means of a pressurized gas, and the gas pressure difference between the two ends of the sample and the gas flow rate through the sample can be calculated. Outlet distribution curve.

The bubble method was first proposed by Soviet scholars in 1950. It has been studied by scholars from Germany and the United Kingdom, and the instrument products are sold. They are all graphical methods, which are not only very inaccurate, but also conceptually wrong. In the late 1960s, China's iron and steel Research Institute began homemade devices pore size distribution measurements relating to the filter material by Chinese scholars Hu Rongze rigorous analytical formula is derived, not illustrated, easy to calculate, now has more than 40 years.

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