Static mixers and their applications. Static mixers are generally made up of similar, fixed mixing units installed at right angles to each other in series along a tube or a channel. The energy of mixing is extracted from the flow. Twelve different units are presented. The mixing effect in static mixers under conditions of laminar flow is accomplished either by specially designed feed systems, by cutting and twisting, by displacement and distortion, or by separation and expansion. Depending upon the mixer, very different lengths are required to achieve the same degree of homogeneity. Compared with an empty tube, the pressure drop in static mixers is some 7‐to 200‐fold greater for laminar flow and 100‐ to 600‐fold greater for turbulent flow. Static mixers are employed in all areas of chemical engineering for homogenization, for reduction of the resisdence‐time spectrum, and for heat exchange. Since maintenance and wear are negligible, since incorporation frequently requires no extra space, and since they can be used over wide ranges of viscosity, static mixers are being increasingly employed in continuous processes.
Mit m (Re = 8000) = 0,046 und G1. (1) Application and design of static mixers. Static mixers are units without, or only with fixed, internal fittings which effect the mixing of flowing materials with the aid of their kinetic energy. They are used for continuous homogenization and dispersion, for limitation of the residence time spectrum, and for raising heat and mass transfer in all areas of chemical engineering. Over 20 static mixers are presented, and compared with regard to pressure drop, mixing quality, energy consumption, and residence time and heat transfer behaviour. Important selection criteria are reported. Static mixers have the following advantages over dynamic mixers : use for a wide range of viscosities, narrow residence time spectrum, readily adaptable to existing pipe systems, frequently require no extra space (in-line mixers), negligible maintainance and wear, low investment and operating costs.
which strongly influence the specific yield of three phase fluidized bed reactor. It is shown that the specific yield depends considerably on the operating conditions.A new model is introduced which describes the influence of temperature and degree of curing on the viscosity of a reactive epoxy resin adhesive. The procedure for determining the model parameters is explained with the help of rheology and calorimetry as well as the viscosity calculation which is temperature and degree of curing dependent. The calculated viscosity progression of cross-linking polymers during nontrivial temperature control shows good correlation with the measured viscosity progression.
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