Flow Through Ducts
Introduction
Friction is present in all real flow passages. There
are many practical flow situations where the effect of wall friction is small
compared to the effect produced due to other driving potential like area,
transfer of heat and addition of mass. In such situations, the result of
analysis with assumption of frictionless flow does not make much deviation from
the real situation. Nevertheless; there are many practical cases where the
effect of friction cannot be neglected in the analysis in such cases the
assumption of frictionless flow leads to unrealistic influence the flow. In
high speed flow through pipe lines for long distances of power plants, gas
turbines and air compressors, the effect of friction on working fluid is more
than the effect of heat transfer ,it cannot be neglected An adiabatic flow with
friction through a constant area duct is called fanno flow when shown in h-s
diagram, curves ,obtained are fanno lines. Friction induces irreversibility
resulting in entropy increase. The flow is adiabatic since no transfer of heat
is assumed.
Fanno Flow
A steady one-dimensional flow in a constant area
duct with friction in the absence of Work and heat transfer is known as “fanno
flow”.
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