# hw_8 - ME 141A Intro to Nanotechnology Due Problem Set 8...

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ME 141A Intro to Nanotechnology Due: 3/9/2009 1 Problem Set 8 Problem 9.2 in book Air is flowing through a 40 nm radius carbon nanotube. Can we use the Navier-Stokes equation to analyze this flow? What about if it were in a 4 m radius pipe? Problem 9.7 in book Reynolds number is the ratio of inertial forces to viscous forces. Can you think of another non-dimensional grouping that may be able to tell us the ratio between gravitational forces and viscous forces? Problem 9.8 in book Compute the Reynolds number for each case: (a) A baseball hit by Barry Bonds in Giants Stadium (b) A 10- μ m diameter protozoan flowing at 100 μ m/s in water (c) A blade of grass floating in a pond at 1 mm/s Problem 9.9 in book Compute two familiar technological flows that have a Reynolds number based on overall object size of 0.1 and 100,000,000. Problem 9.17 in book If you put a drop of 5mM blue dye in a very large jar, what is the equation describing the one-dimensional concentration distribution of dye after 5 minutes? Assume the diffusion

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hw_8 - ME 141A Intro to Nanotechnology Due Problem Set 8...

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