A Thomas flowmeter is a device in which heat is transferred at a measured rate from an
Chapter 7, Problem 7.22(choose chapter or problem)
A Thomas flowmeter is a device in which heat is transferred at a measured rate from an electric coil to a flowing fluid, and the flow rate of the stream is calculated from the measured increase of the fluid temperature. Suppose a device of this sort is inserted in a stream of nitrogen, the current through the heating coil is adjusted until the wattmeter reads 1.25 kW, and the stream temperature goes from 30C and 110 kPa before the heater to 34C and 110 kPa after the heater. (a) If the specific enthalpy of nitrogen is given by the formula H^kJ/kg 1:04TC 25 what is the volumetric flow rate of the gas (L/s) upstream of the heater (i.e., at 30C and 110 kPa)? (b) List several assumptions made in the calculation of Part (a) that could lead to errors in the calculated flow rate.
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