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Reference.org
Stream thrust averaging
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<p>In <a href="/facts/Fluid_dynamics/y7uzSCfg">fluid dynamics</a>, stream thrust averaging is a process used to convert three-dimensional flow through a duct into one-dimensional uniform flow. It makes the assumptions that the flow is mixed <a href="/facts/Adiabatic/rJj42U5h">adiabatically</a> and without <a href="/facts/Friction/d0108Rpu">friction</a>. However, due to the mixing process, there is a net increase in the entropy of the system. Although there is an increase in <a href="/facts/Entropy/s52IXeFz">entropy</a>, the stream thrust averaged values are more representative of the flow than a simple average as a simple average would violate the <a href="/facts/Second_law_of_thermodynamics/m7SJ2eeH">second law of thermodynamics</a>. </p>