Air flows at \(100^{\circ} \mathrm{F}\) in a pipe system in which the diameter increases in two stages from 2 in. to 3 in. to 4 in. Each section is \(6 \mathrm{ft}\) long. The initial flow rate is high enough so that the flow is turbulent in all sections. As the flow rate is decreased, which section will become laminar first? Determine the flow rates at which one, two, and then three sections first become laminar. At each of these flow rates, determine which, if any, of the sections attain fully developed flow.

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D = 4 in. D= 3 in. D= 2 in. P8.4