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Viscosity of fluid medium

Article source:人气: date:2015-9-12 15:29:18
 The viscous force is the force that the fluid is subjected to shear stress or when it is stretched. A flow resistance in the interior of a viscous liquid, and may be considered to be an attractive force of the fluid itself.
In everyday life, it is like a "sticky" or "fluid"". Therefore, the water is "thin", with a low viscosity, while the honey is "thick", with a high viscous force. Simply said, the less viscous force (viscous coefficient is low) of the fluid, the better the flow.
Viscosity is a measure of the fluid viscosity, the fluid to flow resistance. Which is defined as: liquid to 1cm / s. The flow velocity, in each 1cm l plane required shear stress size, called dynamic viscosity, handkerchief, seconds (by) as a unit.
1 Pascal (1Pa.s) =1000 Pascal seconds (1000mPa.s)
Pascal was 1 seconds (1mPa.s) = 1 CPS (1cP);
1 pa (1Pa) = 100 CPS (100cP);
1 pa (1Pa) = 1 g / cm;
1 Pascal seconds (1Pa.s) = 1000 milli seconds (1000mPa.s Pascal) =1000 CPS (1000cP) =10 PA (10Pa)
Viscosity is a property of fluid. Fluid flow in the pipeline, there are three kinds of laminar flow, transitional flow, turbulent flow, mixing equipment, also there are three kinds of flow state, and the main parameters that determine the state of the fluid viscosity.
In the mixing process, it is generally thought that for low viscosity fluid viscosity is less than 5Pa/s of, for example: water, castor oil, malt sugar, jam, honey, lubricating oil, low viscosity emulsion; 5-50Pa/s viscosity fluid, such as: ink, toothpaste etc.; 50-500Pa/s for the high viscosity fluid, such as chewing gum, plasticized sol, solid fuel etc.; more than 500Pa/s for extra high viscosity fluid for example: rubber mixture, melt plastic and silicone.
For low viscosity medium, with a small diameter of the high speed of the mixer will be able to drive around the fluid circulation, and to the distance. The fluid of high viscosity medium is not, need to be driven directly by the agitator. For use on the impeller of the low viscosity and viscous fluid with paddle type, open type of turbine, push type, long thin leaf propeller, turbine disc, Bruma gold type, frame paddle, clover after bending, MIG type and so on. The impeller is suitable for high viscosity and high viscosity fluid with spiral impeller, screw, anchored, frame type propeller, etc.. Some of the fluid viscosity with the reaction to change, it is required to use the field of wide viscosity of the impeller, such as pan type impeller, etc..