A T-junction structure is common in nuclear reactor systems, and plays an essential role in safety operation. An accurate estimation of the resistance characteristics of a T-junction is important for both energy conservation and engineering design. In the current study, the concept of the head loss coefficient K for a local structure was proposed, and its thermodynamic definition is extended to laminar flow within a T-junction by an entropy production approach, which was initially for turbulent flows. Specific numbers of K was determined by integration of the entropy generation rate obtained from a numerical simulation. In addition, the correlation between K and Re of combining and dividing flows was also derived.

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