Abstract: This paper set up a mathematical modelling, wich is directed against Solution in laminar flow in one-tube outer pressurize reverse osmosis, ultra-filtation plant. Using Runge-Kutta numerical value calculation in the light of the specific boundary conditions, the formula show velocity distributed equation of solution in the plant is developed by means of electronic computer. At the same time, the axial velocity distributed of solution at difference place of plant is measured by velocity probe.
The exprimental results obtained show that the mathematical model test result is good in accordance with the experimental data.