Slotted mixing sections

A Swedish company, Axon, has patented such a design in many European countries [43]. Many other slotted mixing sections have been developed over the years. 

Distributive mixing is achieved in kneading disks and slotted mixing sections placed along the screw. W P has developed a mixing tip [45] that has a protruding helical flight as shown in Fig. 10.64. 

Slotted Flight Mixers. There are a great number of slotted flight mixers. Examples of slotted mixers are the Dulmage (Fig. 54) and the Saxton mixing sections (Fig. 55). 

Fig. 23. Screw sections for enhancing distributive mixing in single-screw extruders (a) Dul-madge mixer, (b) Saxton mixer, (c) pin mixer, (d) pineapple mixer, (e) cavity transfer mixer, (f) slotted screw flight, (g) Kenics and Ross ISG static mixers [148]...

Make the acrylamide/urea solution up to 99 ml with H20, add 0.8 ml 10% ammonium persulphate and 50 p TEMED (NNN N -Tetramethylethylene-diamine). Mix briefly by swirling and pour into the electrophoresis cell (Section 3.1.2.) making sure that no bubbles are trapped in the gel mixture. Insert the slot former (12—20 slots) made from a piece of Plasticard (Fig. 3.3.), place the gel raised slightly from the horizontal and put a weight over the top of the gel to ensure a tight fit of the slot former. 

The first section presents some fundamental ideas that are frequently referred to in the remainder of the chapter. The next three sections deal with the major topics in natural convection. The first of these addresses problems of heat exchange between a body and an extensive quiescent ambient fluid, such as that depicted in Fig. 4.1a. Open cavity problems, such as natural convection in fin arrays or through cooling slots (Fig. 4.1fe), are considered next. The last major section deals with natural convection in enclosures, such as in the annulus between cylinders (Fig. 4.1c). The remaining sections present results for special topics including transient convection, natural convection with internal heat generation, mixed convection, and natural convection in porous media. 

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