hw5asol-dist

hw5asol-dist - CBE 320 Transport Phenomena Solutions...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CBE 320 September 28, 2009 Transport Phenomena Problem Session V Part A: Equations of Change 1. Electroosmosis. Electroosmosis is the flow driven by an electric feld acting on charges within a fluid. You will analyze such a flow in this problem. A fluid is contained in a slit Formed by a plastic and a glass surFace, as illustrated in the fgure below. The glass naturally attains a negative charge, creating positive charges within the fluid very near the glass surFace. x h L P 0 P 0 z f (x) z v (x) z + + + - - -------------- + + + + + glass plastic g When an electric feld is applied in the z direction, an electric Force acts on the positive charges— and thus the fluid—in the positive z direction. ±or this setup, the Force per unit volume oF the fluid (a vector) is given by f = A exp ( κx ) δ z , (1) where A is a known constant, and κ is another known constant that characterizes how rapidly the Force diminishes with increasing distance away From the glass surFace. In this problem it is reasonable
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

hw5asol-dist - CBE 320 Transport Phenomena Solutions...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online