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Dmitriy789 [7]
3 years ago
7

Yeast cells are recovered from a fermentation broth by using a tubular centrifuge. Sixty percent of the cells are recovered at a

flow rate of 12 l/min with a rotational speed of 4000 rpm. Recovery is inversely proportional to flow rate. a. To increase the recovery of cells to 95% at the same flow rate, what should be the rpm of the centrifuge?
Biology
1 answer:
Serga [27]3 years ago
7 0

Answer:

\\ \omega = 5033.22 \ rpm

Explanation:

Given that:

R_1 = 0.6\\\\R_2 = 0.95\\\\\omega_1 = 4000 \ rpm\\\\\omega_2 = ???\\\\Q_1 = 12\ l/min\\\\Q_2 =  12\ l/min

For a continuous centrifuge ; solid recovery R ∝ \frac{\omega^2}{Q}

where;

ω = angular velocity of the centrifuge in rpm

Q = flow rate

SO;

R_1 \alpha \frac{4000^2}{12}

R_2 \alpha  \frac{\omega^2}{12}

\frac{R_1}{R_2} = \frac{4000^2}{12}  ÷  \frac{\omega^2 }{12}

\frac{R_1}{R_2} = \frac{4000^2}{12} * \frac{12}{\omega^2}

\frac{R_1}{R_2} = \frac{4000^2}{\omega^2}\\\\\frac{0.6}{0.95} = \frac{4000^2}{\omega^2}

{\omega^2} = \frac{4000^2*0.95}{0.6}\\\\\\{\omega} = \sqrt{ \frac{4000^2*0.95}{0.6}}\\\\\\ \omega = 5033.22 \ rpm

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