What is the bubble method?

The pore distribution range of common porous materials such as ceramics and metal filters usually ranges from a few tenths of a micron to tens of microns. The bubble method is just suitable for measuring pores in this range. It is also the most commonly used of all large pore measurement methods at present, whether it is It is relatively mature both theoretically and experimentally.

The basic principle of the bubble method is: for a porous sample that has been soaked with liquid in advance, the liquid in the hole is discharged with the help of pressurized gas. By measuring the gas pressure difference at both ends of the sample and the gas flow rate flowing through the sample, it can be calculated. Outlet distribution curve.

The bubble method was first proposed by Soviet scholars in 1950. It was successively studied by German, British and other scholars, and instruments and products were launched for sale. They all used diagrammatic methods, which not only had large errors, but also had conceptual errors. In the late 1960s, the China Iron and Steel Research Institute began to make its own equipment to measure the pore distribution of filter materials, and Chinese scholar Hu Rongze derived a strict analytical formula, which does not require diagrams and is easy to calculate. It has been 40 years now.