Liquid is filled inside a thermal flask at room temperature and it is closed with a two-hole rubber stopper. A U shaped pipe was immersed in water and its two ends were passing through the two holes in the stopper. Hot air (above boiling point of liquid) is passed through the U shaped tube at a rate of Q lt/min.
Capasity of container: 20L
Dia: 0.1m
Height: 0.65m
Liquid filled: 10L
U shaped pipe:
Outer dia : 4mm
Inner dia: 2mm
Material: copper
Overall Length: 1.5m
Immersion overall legth: 0.652m
Flow rate of hot air: 10 L/min
To connect an U-shaped pressure gauge to the flask head may help you measure the pressure building up inside the thermal flask. Keeping sealing well is important for this measurement.
To find the weight difference of flask at different time may tell you how much liquid has evaporated.
Pressure build up should be measured using a gauge. Be sure and select the right type of pressure transducer which is safe for use under the conditions chosen.
Regarding evaporation, the system you describe appears to be sealed so no evaporation and loss would occur. If there is any opening somewhere, then a mass tare of before and after would be the simplest technique to use.
I think the U-shaped pressure gauge is sensitive enough for you experiment. I had used here for impinger performance checking "Effect of back-pressure on absorption efficiency of impingers used for air sampling".
Thanks you for the response (bill and xinguang)
Experimentally pressure has already determined using gauges.
Actually, i am intended towards theoretical way.
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