Abstract
The validity of the “theorem” of minimum entropy production (per unit time) is assessed for the well documented case of single-phase fluid tube flow bifurcations from laminar to turbulent regimes, with and without external heat exchange. The analysis leads to the following main conclusions. (1): This “theorem” is not generally valid. (2): The stable type of flow regime is associated with a maximum specific (per unit mass) entropy change. The second conclusion provides additional empirical support for the analytical methods based on an “entropy maximizing principle” proposed by several researchers to predict stable flow regimes and/or void fractions in highly complex two-phase flow situations.
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