By M.F. Edwards, N. Harnby and J.C. Middleton (Auth.)
Read Online or Download Fluid Mixing II. A Symposium Organised by the Yorkshire Branch and the Fluid Mixing Processes Subject Group of the Institution of Chemical Engineers and Held at Bradford University, 3–5 April 1984 PDF
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Extra info for Fluid Mixing II. A Symposium Organised by the Yorkshire Branch and the Fluid Mixing Processes Subject Group of the Institution of Chemical Engineers and Held at Bradford University, 3–5 April 1984
In determining, the relationship between T b and 0γ> allowance must be made for the liquid pressure p. Therefore, an effective normal stress o b is defined:- °b s (12) °b * P Friction between the blade and cake is limiting:T b a (13) ^b°b where y b is the coefficient of friction between the blade and cake. Similarly, an effective normal stress at the wall a w must take account of both pressure and adhesion forces. a w - ^w - p - o a d (14) 39 Symposium Series No. 89 However, i n c a l c u l a t i n g f r i c t i o n a l f o r c e s t h e e f f e c t s of normal and adhesive f o r c e s are a d d i t i v e ( 5 ) .
The constant G is a function of the detailed geometry of the impeller, blade width, thickness and the number of blades. 0. In our present work we have used a vessel with rounded bottom as depicted in fig. 1. (1) for equal clearances. Figure 3 also shows the increase in power number for small clearances. TWO PHASE SYSTEM LIQUID-SOLID For all experiments reported in this paper we have used sand particles 100 ym with narrow size distribution and Zwietering's 1-2 sec. criterion (Zwietering (1958)) for determination of complete suspension.
From 11 and 13 σ From 10, w( b) (a ) w Equation 13, b w (cos Θ - \ib s i n θ) (16) 15 and 16 ' be b b (a ) b b b (a ) w 17 can be s i m p l i f i e d if (Mg + μ a σ ) >, w ad ^ a^ σ' s i n θ w w (a ) w ad (17) y b = p w = μ. (1 + μ 2 ) (18) Equation 18 limits the normal stress a b that the blade can exert in order to maintain a stable cake. Equation 18 applies to the wall where the blade leaves the trough. For walls where the blade enters the trough it can be shown that:(1 + μ 2 ) > ' (Mg - μ a % σ ) w ad σ' sin θ (19) Equations 18 and 19 are the criteria for stable cake formation at the opposite walls of a ribbon mixer.