An insulated pipe of inside diameter 50 mm contains steam of specific enthalpy 2·794 MJ/kg and specific volume 0·0394 m3 /kg. The pipe then reduces to 25 mm diameter, and the specific enthalpy is then 2·786 MJ /kg and the specific volume is 0·1043 m/kg. Determine the mass flow rate of the steam and its velocity in both sections of the pipe

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Q: Air at 100 kPa and 280°K is compressed steadily to 600 kPa and 400°K. The mass flow rate of the air…

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Q: The cross section of the rectangular duct of the heating system is 15 cm x 20 cm (figure shown…

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Q: Q 3. A 5-m-long section of an air heating system of a house passes through an unheated space in the…

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Q: Steam enters an isothermal compressor at 400 C and 100 kPa. The exit pressure is 10 MPa. Determine…

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Q: A long roll of 1-m-wide and 0.5-cm-thick 1-Mn manganese steel plate (ρ = 7854 kg/m3 ) coming off a…

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Q: The entropy of a cup of hot coffee decreases as it cools. Is this a violation of the increase of…

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Q: Water at 80°F and 20 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia.…

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Q: The fan on a personal computer draws 0.3 ft3 /s of air at 14.7 psia and 70°F through the box…

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Q: Steam enters a long, insulated pipe at 1200 kPa, 250°C, and 4 m/s and exits at 1000 kPa. The…

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Q: A pump increases the water pressure from 100 kPa at the inlet to 900 kPa at the outlet. Water enters…

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Q: air enters a 300-mm diameter pipe steadily at 250 KPa and 25 °C with a velocity of 4.5 m/s. Air is…

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Q: Steam enters a turbine steadily at 7 MPa and 600°C with a velocity of 60 m/s and leaves at 25 kPa…

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Q: A 4-m-long section of an air heating system of a house passes through an unheated space in the…

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Q: Air enters a 28-cm diameter pipe steadily at 200 kPa and 20°C with a velocity of 5 m/s. Air is…

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Q: Define mass and volume flow rates. How are they related to each other?

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.