Answer Posted / kumar

Take 2" pipe, and place an 2mm orifice in the pipe line.
Suppose that the pressure before orifice is 5bar. Due to
this obstruction to the flow(in the form of orifice), the
energy of the fluid will decrease. Wherever pressure is
high, there automatically quantity of the fluid also high.
So that before orifice, assume that hot fluid flowing
throughout the circumference of the pipe line. After
orifice there is less chance to flow of the fluid due to
area restriction. Here after orifice, the fluid is flowing
only 30% of the circumference of the pipe. Here large area
is available for heat tranfer. So that there is a chance
of decreasing in temperature.

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