- #1

hizen_14

- 8

- 0

## Homework Statement

Diffusion coefficient (D) of 100 nm particles ( density = 1050 kg/m

^{3}) in a viscous solvent at 25 C is 2.2 x 10

^{-13}m

^{3}/s

What is the average shear rate at the particle surface?

## Homework Equations

D = kT/ 6πηa (1)

where k is Boltzman constant, T = temperature, η

_{susp}= viscosity and a = radius

Pe = a

^{2}γ /D (2)

where γ = shear rate

## The Attempt at a Solution

Assumed particles are in water

To find shear rate of particle surface I am not too sure that eq2 is the right equation to use or not. Can we assume that Pe = 1 ??

Pe = 1 means the solvent in the viscous state ?

Thank you

Zen