Rayleigh flow
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Rayleigh flow is (frictionless) flow with heat transfer through a pipe of constant cross sectional area. In practice Rayleigh flow is difficult to achieve, yet practical and a useful concept in an obtaining trends and limits. The density and pressure change due to external cooling or heating. This model applied to the case where the heat transfer is significant. The heat transfer in Rayleigh flow occurs either between unknown temperature to tube but the heat flux maintained constant.