DESCRIPTION The apparatus comprises a clear acrylic mixing vessel mounted on a stainless steel base. Abovethis ismounted a variable-speed electronic mixer with electronic torque measurement incorporated. A set of PVC baffles can be fitted into the mixer with a simple screw mechanism to hold them in place. Under the stainless steel base is a storage compartment for the various small mixer components and the simple tools (hexagonal keys) required to change them. The larger mixer components are stored on pins behind the vessel. The Rushton turbine impeller is a one-piece stainless steel fabrication with eight alternate upward and downward-pointing blades. The flat blade impeller comes with six sizes of blade, each of which can be fitted in seven positions (vertical, plus 30/45/60 degrees leading and trailing edge). The blades are simple to configure and position accurately in place using a single screw. A propeller type stirrer is also included for comparison. The CEK MkII is supplied with armSOFT aLITE software, which logs the speed and torque of the mixer. From these values it calculates the mixer power and can display the data in real-time using its powerful graph-plotting facilities. To use this facility a standard Windows PC with serial interface (or a USB serial adaptor) is required. These are not supplied by . Highly visual, with variable-speed mixer with a range of interchangeable impellers High-speed mixing available, 50 to 2,200rpm Precise electronic RPM setting Electronic measurement of torque Removable baffles (zero, two or four-baffle configuration) Data logging software True Rushton turbine impeller Precise angle setting for the adjustable flat blade impellers Optional removable heating/cooling coil with temperature sensor and meter EXPERIMENTAL CONTENT To observe the various flow patterns that can be achieved by the use of different impellers with and without the use of baffles To show how the power consumed by a mixer varies with speed, type of impeller, and with the inclusion of baffles Torque/power/speed characteristics of different impellors To observe how different types of impeller turning at different speeds influence the rate of dispersion of solids throughout the liquid To observe the effectiveness of different impeller configurations running at different speeds, with and without baffles, on the mixing of immiscible liquids To study the effectiveness of different impeller configurations running at different speeds, with and without baffles, on the rate of mixing an electrolyte in water Investigation of how mixing time affects the quality of mixing Effect of flat blade paddles, propellers and agitators on mixing To predict the power absorbed by a large mixer using the Fluid Mixing Apparatus provided as a model and to draw a characteristic mixing curve To observe the effect of temperature on the viscosity of fluids and the corresponding changes in stirring characteristics
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