Question

Atmospheric air at a velocity of $61 \mathrm{~m} / \mathrm{s}$ and a temperature of $16^{\circ} \mathrm{C}$ enters a $0.61-\mathrm{m}$-long square metal duct of $20-\mathrm{cm} \times$ $20-\mathrm{cm}$ cross section. If the duct wall is at $149^{\circ} \mathrm{C}$, determine the average heat transfer coefficient. Comment briefly on the $L / D_h$ effect.

   Atmospheric air at a velocity of $61 \mathrm{~m} / \mathrm{s}$ and a temperature of $16^{\circ} \mathrm{C}$ enters a $0.61-\mathrm{m}$-long square metal duct of $20-\mathrm{cm} \times$ $20-\mathrm{cm}$ cross section. If the duct wall is at $149^{\circ} \mathrm{C}$, determine the average heat transfer coefficient. Comment briefly on the $L / D_h$ effect.

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Principles of Heat Transfer

Principles of Heat Transfer

Frank Kreith, Raj M.… 7th Edition

Chapter 6, Problem 14

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Step 1

** - Velocity of air, \( V = 61 \, \text{m/s} \) - Temperature of air, \( T_{\infty} = 16^{\circ} \text{C} \) - Length of duct, \( L = 0.61 \, \text{m} \) - Cross-sectional dimensions of duct, \( D = 0.20 \, \text{m} \) (since it is a square duct, \( D_h = Show more…

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Atmospheric air at a velocity of $61 \mathrm{~m} / \mathrm{s}$ and a temperature of $16^{\circ} \mathrm{C}$ enters a $0.61-\mathrm{m}$-long square metal duct of $20-\mathrm{cm} \times$ $20-\mathrm{cm}$ cross section. If the duct wall is at $149^{\circ} \mathrm{C}$, determine the average heat transfer coefficient. Comment briefly on the $L / D_h$ effect.

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