Average channel width

The average channel width is used for many of the calculations in this book. This average channel width is represented as simply W here and is calculated using Eq. 1.10. The use of the average channel width will be discussed in detail in Chapter 7. 

Channel width (pm) too streams Inlet average velocity (m s ) 0.2... 

The average flow velocity is independent of the channel width and geometry over a wide range of dimensions (roughly 10°-103 pm). 

Example 8.2 Using Eq. 8.7, find the diameter of unit-density spheres that would be deposited 2 cm from the entrance of a centrifuge that is operated at 300 r/min with an average channel velocity of 100 cm/s. The centrifuge inner radius is 15 cm, and the channel width is 1 cm. Assume k = 2. 

Applying the definition of the retention parameter X (see Sect. 1.4.1), one can define the average concentration over the channel width as ... 

N-m/s and the downstream depth of the jump is 0.94 m. The rate of inflow into the jump is 0.048 mVs. The upstream depth of the jump is 5 cm and the temperature of mixing is 25°C. What is the channel width At a motor efficiency of 90% and a brake efficiency of 75%, the power input into a mixer was found to be 16,459 N-m/s. The average velocity gradient in the mixer tank is 1500s and the temperature of mixing is 25°C. Find the volume of the mixer. 

From the discussions outlined so far, it is apparent that the zeta potential happens to be one of the key parameters that dictates the overall potential distribution within the EDL. Several experimental techniques have been reported in the literature for an accurate measurement of this important parameter. In the subsequent discussions, the general principle behind these techniques is briefly outlined. The existing methodologies for the measurement of C primarily rely on the measurement of electroosmotic flow velocities through microfluidic conduits. When an electrical field is applied tangentially to a solid—liquid interface, an electrical body force is exerted on the excess counterions in the diffuse EDL. These ions move under the action of the applied electrical field, pulling the liquid with them. For thin EDLs (relative to the half channel width), the average electroosmotic flow velocity can be expressed as... 

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