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darlasiller
10.03.2020 •
Engineering
Consider liquid n-hexane in a 50-mm diameter graduated cylinder. Air blows across the top of the cylinder. The distance from the liquid-gas interface to the top of the cylinder is 20 cm. Assume the diffusivity of n-hexane is 8.8.10^-6 m^2/s. The liquid n-hexane is at 25°C. Estimate the evaporation rate of the nhexane.
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Ответ:
The evaporation rate of the n-Hexane is![7.85 \times 10^{-6} \mathrm{mol} / \mathrm{s}](/tpl/images/0539/5990/7f39c.png)
Explanation:
This is a situation regarding diffusing A through non-diffusing B.
A = n-Hexane B=Air
Where the molar flux is provided by,
For wind, assume negligible hexane is present, hence![P_{A 2}=0](/tpl/images/0539/5990/aa73c.png)
Now,
where T = 298 K
substituting all in the equation, we get
Now,Flux
area = Molar rate of evaporation
Evaporation rate =![0.004 \mathrm{mol} / \mathrm{m}^{2}-5 \mathrm{x}\left(\pi \mathrm{d}^{2} / 4 \mathrm{m}^{2}\right)=0.004 \times(3.14 \times 0.05 \times 0.05 / 4)](/tpl/images/0539/5990/81379.png)
Evaporation rate =![7.85 \times 10^{-6} \mathrm{mol} / \mathrm{s}](/tpl/images/0539/5990/7f39c.png)
Ответ: