CONTINUOUS MIXING AND PROCESSING 645 0.•I9 0.146 Scllaschlik Mixer STATIC MIXER © J Unit Pipe With ß Radial Inlet ß ß ß ß J Empty Pipe .... 0.0?3 0 I0 20 50 40 50 L/d Pressure drop vs. relative length of the mixer Figure 6. Pressure drop vs. relative length of the mixer Where Ap = pressure drop in empty pipe f = Darcy's friction factor L = length of pipe D = inside diameter of pipe v = velocity of fluid go = gravitational acceleration p = density of fluid Pressure drop in the device of the same length and diameter as an empty pipe is determined by multiplying the calculated pressure drop in the empty pipe by a oeaetor, K. That is: AP•s,.• -- K AP (5) where APs•t is the pressure drop in the device. The factor, K, is a function of the geometry of the mixer elements and the Reynolds number. The values of K were determined under different conditions. To facilitate the calculation of pressure drop in the device, the values are tabulated and plotted for different conditions (Figs. 7, 8, and Table I). The factor, K, is determined according to the range of the Reynolds number,

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