Measurement of turbulent mixing state in a tubular flow reactor equipped with an agitating object

The authors have developed a new multi-point and fast-scanning system for measuring a concentration variation in a tube for continuous liquid flow, which is usually used as a tubular reactor or mixer. The system can continuously capture, as a pattern, the turbulent mixing state of a whole section of the tube using the electric conductivity method with electrode couples having high-frequency responsiveness. After ascertaining its performance and measuring precision, the authors investigated the enhancing effect of contain kinds of agitating objects, viz. a sphere, a disk, and a cylinder, on turbulent mixing in the tube. Object with various diameters were settled in a nozzle for subsidiary liquid flow of an aqueous electrolyte solution. It was found that a disk type object has the best effectiveness of the three kinds of objects, on condition that pressure loss resulting from the objects is identical among them.