Recent content by hizen_14

Homework Statement if we have only a measuring cylinder (500mm high and 50mm diameter), a stop-watch, a ruler and a 100μL syringe. We assume that the density of the suspension is 1g/cm3, and that the polymers are spherical How can we determine the viscosity and the volume fraction of the...

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Hi Chet. I am not really sure about but I can see as the radial velocity gradient at the particle surface (dv/dx) Fg-Fb-Fd = 0 at Terminal Velocity where Fg = gravity force, Fb = buoyancy force and Fd = drag force. Fg = (Vρpg) Fb = (Vρfg) Fd = 9πηrv v = (2r2 Δρg) / 9η I am not really...

I think this one is more reasonable ? v = (2r2 Δρg) / 9η = ( 2x( 50x10-9 )2 x (1050-1000) x 9.8) / (9 x 8.9x10-4) = 3.059 x 10-10 m/s THanks

Thanks Chet I have changed the radius of particle from 100µm to 50µm but the velocity was larger than 50 µm. it doesn't make sense. :( Vav = ((3kT)/m)1/2 Volume of particle = 4/3 πr3 = 4/3 π (50x10-9)3 = 5.236 x10-22 m3 Mass of particle = ρV = 1050 x 5.236x 10-22 = 5.498 x 10-19 kg Vav =...

Hi Chet ! Yes you are right I have done part a-c. My answer on C was 0.05 m/s Thanks Zen

Hi Chet, This is the full question Thanks

Homework Statement Diffusion coefficient (D) of 100 nm particles ( density = 1050 kg/m3) in a viscous solvent at 25 C is 2.2 x 10-13 m3/s What is the average shear rate at the particle surface? Homework Equations D = kT/ 6πηa (1) where k is Boltzman constant, T = temperature, ηsusp =...