Isothermal flow

Isothermal flow is a model of compressible fluid flow whereby the flow remains at the same temperature while flowing in a conduit.^[1] In the model, heat transferred through the walls of the conduit is offset by frictional heating back into the flow. Although the flow temperature remains constant, a change in stagation temperature occurs because of a change in velocity. The interesting part of this flow is that the flow is choked at and not at Mach number equal to one as in the case of many other model such as Fanno flow.

For an important practical case of a gas flow throw a long tube the model has an applicability in situations which occurs in a relatively long distance and where heat transfer is relatively rapid so that the temperature can be treated, for engineering purposes, as a constant. This model has also applicability as upper boundary to Fanno flow.

See also

• Fanno flow
• Isentropic process
• Rayleigh flow

References

External links

• Fundamentals of compressible Flow