Question
Consider flow of standard air at $1250 \mathrm{ft}^{3} / \mathrm{min}$. Compare the pressure drop per unit length of a round duct with that for rectangular ducts of aspect ratio $1,2,$ and 3. Assume that all ducts are smooth, with cross-sectional areas of $1 \mathrm{ft}^{2}$
Step 1
In this case, $Q = 1250 \, \text{ft}^3/\text{min}$ and $A = 1 \, \text{ft}^2$, so \[V = \frac{Q}{A} = \frac{1250 \, \text{ft}^3/\text{min}}{1 \, \text{ft}^2} = 20.8 \, \text{ft/s}.\] Show more…
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8.131 Consider flow of standard air at $1250 \mathrm{ft}^{3} / \mathrm{min}$. Compare the pressure drop per unit length of a round duct with that for rectangular ducts of aspect ratio $1,2,$ and 3. Assume that all ducts are smooth, with cross-sectional areas of $1 \mathrm{ft}^{2}$
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