Question One: Calculate the diffusivity by following the below
statement and requirements
In a thin film technique used for pyrolysis process, and at Temperature
of 500°C the thin-film allows unstable volatile products to diffuse
through the reactive medium and escape to the gas-phase before they
breakdown. To determine whether liquid-diffusion or pyrolysis chemistry
is faster, the Damkohler Number (Da) is used to compare the ratio of
diffusion resistance Taiffusion and reaction resistance Treaction time scale
L = thin-film thickness = 3um =
K = reaction rate =0.65-1
D = DA is the liquid-phase diffusivity calculated using the
semi-empirical Wilke-Chang method. To calculate DA,
composition-dependent properties, such as molar volume,
viscosity and molecular weight are needed.
1. Assumes two cases by using the below data
Case One ( Slower Diffusion)
Case Two (Fast Diffusion)
a levoglucosan solute in a
water is diffusing through
2. Find their Molar Volume, Viscocisty and molecular
3. Illustrate semi-empirical Wilke-Chang method
4. Perform the calculation for Da in both of the above cases
5. Suggest an alternative way to calculate the the ratio of
diffusion resistance Tdiffusion and reaction resistance Treaction time
6. Provide all the required references.
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