Related questions with answers


Combustion gases passing through a 55-cm-internaldiameter circular tube are used to vaporize wastewater at atmospheric pressure. Hot gases enter the tube at 115 kPa115\ \mathrm{kPa} and 250C250^{\circ} \mathrm{C} at a mean velocity of 5 m/s5 \mathrm{~m} / \mathrm{s} and leave at 150C150^{\circ} \mathrm{C}. If the average heat transfer coefficient is 120 W/m2K120 \mathrm{~W} / \mathrm{m}^2 \cdot \mathrm{K} and the inner surface temperature of the tube is 110C110^{\circ} \mathrm{C}, find (a) the tube length and (b) the rate of evaporation of water. Use air properties for the combustion gases.


Answered 2 years ago
Answered 2 years ago
Step 1
1 of 12


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.

Create an account to view solutions

Create an account to view solutions

More related questions