A certain pipe carries water at 20 degrees C, delivering 10 m**3 per minute. The

Question

A certain pipe carries water at 20 degrees C, delivering 10 m**3 per minute. The water is then cooled to 15 degrees C. How does the volume rate of flow compare, and what is the best explanation? Hint: don't assume that the flow of water is ideal, that is, don't assume the viscosity is zero.

(a) the flow rate will stay the same because rate of flow does not depend on temperature

(b) the flow rate will increase because viscosity increases when temperature is lower

(c) the flow rate will decrease because the decrease in viscosity will decrease speed

(d) the flow rate will decrease because viscosity increases

Explanation / Answer

D) Flow rate will decrease because viscosity increases.

Viscosity of the fluid decrease with increase in temperature. So when temperature is decreased due to viscous force velocity of fluid decreases and hence flow rate.

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