Question
Gasoline is piped underground from refineries to major users. The flow rate is $3.00 \times 10^{-2} \textrm{ m}^3\textrm{/s}$ (about 500 gal/min), the viscosity of gasoline is $1.00 \times 10^{-3} \textrm{ Pa}/cdot\textrm{s}$, and its density is $680 \textrm{ kg/m}^3$. (a) What minimum diameter must the pipe have if the Reynolds number is to be less than 2000? (b) What pressure difference must be maintained along each kilometer of the pipe to maintain this flow rate?
1. $13.0 \textrm{ m}$
2. $4.30 \times 10^{-6} \textrm{ Pa}$
Solution Video