Question

A diffuser, flowing R134a, has a mass flow rate of 5.0 kg/s. At the inlet, the R134a is a saturated vapor at 20°C with a velocity of 100 m/s. The area of the diffuser at the inlet is closest to: Diffuser

Answer 1

So mass flow rate of saturated vapoue is given by

dm dt = PsAv

here $\rho _s$ is density of saturated vapour at 20 degree centigrad which is from table we get 17.3 gm /m^3 or

=0.0173 kg/m^3

and

v is velocity of flow =100m/s

and mass flow rate is 5kg/s

so we solve for A and get

so, area of diffuser