Temperature and high pressure effects on choked flow in the microchannel

We studied the choked flow behavior of gas flow in a single microchannel at inlet pressures of up to 2.2 MPa. Fair agreement was obtained between the basic compressible flow theory, known as Fanno flow, numerical simulations, and experiments for the mass flow rate dependency on the inlet pressure. Investigation of the effect of varying the inlet temperature on the choked flow behavior revealed that the power law scaling of the maximum flow rate on the temperature varies with inlet pressure. This was suggested, using numerical simulations, to be a result of heat loss to the environment.