Exercise -1
Calculate velocity and flow rate of air leaking through an opening of rectangular cross section in a furnace wall (as shown below in the figure) from the following data:
| Figure 26.1: |
Air leakage through furnace opening |
Cross section of the opening 
Draft across the opening 
Wall thickness 
Assume turbulent flow and 
Friction losses due to contraction and expansion are 0.5 and 1 respectively.
Air is at  pressure and  temperature
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