What is the significance of back pressure in Electro-osmotic flow?

11 November 2014 1 3K Report

What exactly is back pressure? In usual flow we have a Resistance to flow due to viscous effects and in addition due to bends etc we have some pressure drop due to bends, protrusions etc. which account for resistance to flow and hence back pressure.

How is back pressure generated in EOF? Also if I am not wrong we need to have large value of maximum pressure (the pressure at which there will be no flow) so as to allow maximum flow rate. Kindly correct if I am wrong

Thanks

Jun Zhang

Balance the fluid height in two reserviors first, and then open the electric voltage, do the experiments quickly, before the back pressure increases too much. Another suggestion, using big reserviors (large holes), so that height difference changes slowly.

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