As described in Chapter VIb, one way to measure the mass flow rate is to use a heated duct. Consider

As described in Chapter VIb, one way to measure the mass
flow rate is to use a heated duct. Consider the flow of air in a duct. To
measure the air flow rate, we first raise the temperature of a segment of this
duct and maintain the wall temperature at a desired value. We then measure the
air pressure and temperature at the inlet and exit of the heated segment. Use
this technique and the given data to find the air flow rate in the duct. Data:
Air pressure: 17 psia, air temperature at the inlet: 65 F, air temperature at
the exit: 125 F, duct wall temperature 230 F, duct cross section is 1.5
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As described in Chapter VIb, one way to measure the mass
flow rate is to use a heated duct. Consider the flow of air in a duct. To
measure the air flow rate, we first raise the temperature of a segment of this
duct and maintain the wall temperature at a desired value. We then measure the
air pressure and temperature at the inlet and exit of the heated segment. Use
this technique and the given data to find the air flow rate in the duct. Data:
Air pressure: 17 psia, air temperature at the inlet: 65 F, air temperature at
the exit: 125 F, duct wall temperature 230 F, duct cross section is 1.5 ft by 1
ft, and the length of the heated segment is: 8 ft.

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