Abstract
A laboratory installation has been modernized to study the flow structure in apparatus with a stirrer and in tubular apparatus. The apparatus with the stirrer was replaced; the new apparatus is equipped with a frame stirrer. The rotation of the stirrer is carried out by a stepper motor, which made it possible to change the stirrer speed in a wide range. The support for the stepper motor on the device and the mount of the device to the laboratory stand were 3D printed from ABS plastic. As experiments have shown, for this device it is rational to use the rotation speed range from 100 to 400 degrees per second. The angular velocity value is randomly selected when the controller is turned on. It was decided to abandon analog measuring instruments, so water flow rates were measured with flow meters based on a Hall sensor. The salt concentration was measured using a TDS meter; for this purpose, the sensor was calibrated on solutions with different concentrations at different temperatures. Collecting sensor readings and sending them to the computer was carried out using an arduino duo microcontroller. To visualize the response curves on a computer, a program was written in the julia programming language. For a tubular apparatus, the change in the distribution of indicator concentration in the pipe is additionally shown. For this purpose, a partial differential equation for the diffusion model was solved. The values of the model parameter (back mixing coefficient) were determined based on a variety of experimental data depending on the water flow rate. A web server was created to store data for further processing of experimental results. The server allows, based on the results of the simulation, to determine the parameters of the cellular and diffusion models using several algorithms, as well as to simulate the heat transfer process in a tubular apparatus.
Published Version
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