Abstract
Poiseuille flow in a two-dimensional channel with the special boundary condition of constant wall temperature on both sides is used to demonstrate the important role of reference temperature T R . The local bulk temperature is shown to be the natural choice. Only with this reference temperature the physics of flow stability is clearly revealed. General results are gained by an asymptotic expansion method which is demonstrated to be equivalent to a so-called combined method. This method combines asymptotic considerations and highly accurate numerical solutions of the non-expanded basic equations.
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