Kynch theory

The maximum flux and the point of inflexion are shown in Figure 5a. The Kynch theory is discussed fully in Section 5.2.3. 

Using the Kynch theory, tabulate the sedimentation velocity and solids flux due to sedimentation as a function of concentration. What area of tank will be required to give an underflow concentration of 1200 kg/m3 for a feed rate of 2 m3/min of slurry ... 

The method is applicable for unflocculated pulps or those in which the ionic characteristics of the solution produce a flocculent structure. If polymeric flocculants are used, the floccule size will be highly dependent on the feed concentration, and an approach based on the Kynch theory is preferred. In this method, the test is carried out at the expected feed solids concentration and is continued until underflow concentration is achieved in the cylinder. To determine the unit area, Talmage and Fitch (op. cit.) proposed an equation derived from a relationship equivalent to that shown in Eq. (18-45) ... 

The theory of batch settling is mainly due to Kynch [1951] and begins with the postulation that the settling rate Uo is solefy a fimetion of the solids concentration C. Ihe particle flux G is defined as ... 

The behaviour of the settling system is characterised by the batch settling curve as described in Chapter 3 and design calculations are based on that data u g the Kynch [1951] theory. 

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