Wet steam at a pressure of 2MN/m² flows through a pipe 20m long. The pipe has an external diameter of 80mm. The pipe is covered with lagging 35mm thick which has a coefficient of thermal conductivity of 0.065W/mK. The heat transfer coefficient is 4.5W/m2K and the ambient temperature is 15°C. The steam flow rate is 300kg/h and it enters the pipe with a dryness fraction of 0.97. Assuming there is no temperature drop across the pipe, determine: 3.1 the dryness fraction of the steam as it leaves the pipe;

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter7: Forced Convection Inside Tubes And Ducts
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Wet steam at a pressure of 2MN/m² flows through a pipe 20m long.
The pipe has an external diameter of 80mm. The pipe is covered
with lagging 35mm thick which has a coefficient of thermal
conductivity of 0.065W/mK. The heat transfer coefficient is
4.5W/m²K and the ambient temperature is 15°C. The steam flow
rate is 300kg/h and it enters the pipe with a dryness fraction of
0.97. Assuming there is no temperature drop across the pipe,
determine:
3.1 the dryness fraction of the steam as it leaves the pipe;
Transcribed Image Text:Wet steam at a pressure of 2MN/m² flows through a pipe 20m long. The pipe has an external diameter of 80mm. The pipe is covered with lagging 35mm thick which has a coefficient of thermal conductivity of 0.065W/mK. The heat transfer coefficient is 4.5W/m²K and the ambient temperature is 15°C. The steam flow rate is 300kg/h and it enters the pipe with a dryness fraction of 0.97. Assuming there is no temperature drop across the pipe, determine: 3.1 the dryness fraction of the steam as it leaves the pipe;
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