## Related questions with answers

Combustion gases passing through a $5$-cm-internaldiameter circular tube are used to vaporize wastewater at atmospheric pressure. Hot gases enter the tube at $115\ \mathrm{kPa}$ and $250^{\circ} \mathrm{C}$ at a mean velocity of $5 \mathrm{~m} / \mathrm{s}$ and leave at $150^{\circ} \mathrm{C}$. If the average heat transfer coefficient is $120 \mathrm{~W} / \mathrm{m}^2 \cdot \mathrm{K}$ and the inner surface temperature of the tube is $110^{\circ} \mathrm{C}$, find (a) the tube length and (b) the rate of evaporation of water. Use air properties for the combustion gases.

Solution

Verified$\text{\textcolor{#c34632}{(a)}}$

To find the tube length we need to calculate the surface area of the tube which we can get with the heat rate of combustion gases and log mean temperature difference. For combustion gases, we use air properties, but first, we should find the average temperature to find all needed air properties.

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