- #1
sero2000
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Homework Statement
What is the mass transfer coefficient for natural convection from rock salt (assume flow is over a horizontal cylinder (salt crystal) of length 2cm, diameter 0.5cm).
Given:
Temperature = 24degrees
Density of salt 2165kg/m^3
Density of mixture when salt concentration is saturated = 1310kg/m^3
Homework Equations
Sh = C2 (Gr.Sc)^p
Sc = Kinematic viscosity/Diffusivity
The Attempt at a Solution
I am having trouble finding the correct diffusivity to use for the Sc number. I have previously calculated the maximium concentration of the salt in the water. Which is 6kmol/m^3 and i also a table of values for the diffusivity for different solute concentrations.
So the qn is do i use the maximium concentration of salt to find my diffusivity or do I have to use the actual concentration? Thats because I am not given the volume of the solvent even though i am able to find the mass of the solute by finding the volume of solute x the density.
A great big load of thanks in advance.