Study of the mixing progress in stirred vessel using ERT

In the present study, an Electrical Resistance Tomography (ERT) system was used to investigate the fluid flow pattern and mixing progress inside a cylindrical vessel by injection of NaCl solution to the vessel and measuring the conductivity change in the vessel. A cylindrical vessel with a diameter of 20 cm and the height of 15 cm, equipped with a six-blade Rushton turbine impeller was used in the experiments. Eight stainless steel electrodes with a width, height and thickness of 36, 20 and 1 mm respectively were installed at the equal spatial intervals inside periphery of the vessel at the height of installed impeller. By injection of a predefined current to a pair of adjacent electrodes, the electrical voltage difference of the other neighboring pair electrodes were measured. The measured electrical voltage data were transferred to a personal computer trough a converter after appropriate amplification. A tomography reconstruction algorithm was used to calculate the spatial conductivity variations over a horizontal cross-section in the vessel to show the homogenization progress.

کلیدواژه ها:

Electrical Resistance Tomography ، Rushton turbine ، conductivity ، stirred vessel