That being said, consider the major factors in how uniformity is achieved and the consequences of achieving it. That uniformity (or lack thereof) can affect the reaction, stability, durability, performance and other parameters of the resultant product. What Are You Trying to Achieve? Uniformly blending two or more ingredients is usually the reason for mixing. With this in mind, here are a few pointers to help select the best viscous mixer for a given purpose. A low Reynolds number and a low velocity differential between streamlines further confirm this. Accordingly, the high energy levels imparted by the mixing blade dissipate within a very short distance, resulting in localized heat build-up and poor heat exchange. The mix tends to flow primarily in streamlines and stops flowing a short distance from the blade there is very little turbulent flow to promote mixing. In the viscous range, the formation of eddy currents is limited. Laminar impellers generally fill the entire mixing tank. Figure 3 shows various impeller-design configurations. But there is more to designing a proper high-viscosity mixing system.įirst of all, viscous mixing systems should use laminar impellers, not turbulent impellers. Figures 1 and 2 provide some general guidelines of which mixer types are usually used for various fluids and mixtures. One of the fascinating aspects of high-viscosity mixing is that the mixer must accurately and intensely move the product. Switching to Viscous Flow How then does one go about solving the problem of rapid mixing under viscous-flow conditions? And what insight does this provide that may help in selecting the proper high-viscosity mixer for a particular application?
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