1- Nitrogen is stored in a large chamber under conditions of 450 K and 1.5 x 105 N/m. The gas leaves the chamber through a convergent-only nozzle whose outlet area is 30 cm .The ambient room pressure is 1 × 105 N/m, and there are no losses. (a) What is the velocity of the nitrogen at the nozzle exit? (b) What is the mass flow rate? (c) What is the maximum flow rate that could be obtained by lowering the ambient pressure? ERING

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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.