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Previous analytical results on flow splitting are generalized to considermultiple boiling channels systems. The analysis is consistent with theapproximations usually adopted in the use of systems codes like RELAP5 and TRACE5, among others commonly applied to performsafety analyses of nuclear powerplants. The problem is related to multiple, identical, parallel boilingchannels, connected through common plena. A theoretical model limited inscope explains this flow splitting withoutreversal. The unified analysis performed and the confirmatory computationalresults found are summarized in thispaper. New maps showing the zones where this behavior is predicted are also shown considering again twinpipes. Multiple pipe systems have been found not easily amenable foranalytical analysis when dealing with more than four parallel pipes. However,the particular splitting found flow along N pipes dividing in one standalonepipe flow plus N -1 identical pipe flows has been verified up to fourteen pipes, involvingcalculations in systems with even and odd number of pipes using the RELAP5 systemsthermal-hydraulics code.

KEYWORDS

Multiple Parallel Boiling Channels Systems, Asymmetric Splitting Flow, Verification of Codes, Systems Thermal-Hydraulics Codes, Nuclear Engineering

Cite this paper

Lazarte, A. and Ferreri, J. 2016 Analytical and Computational Analysis of Flow Splitting in Multiple, Parallel Channels Systems. World Journal of Nuclear Science and Technology, 6, 170-190. doi: 10.4236-wjnst.2016.63019.





Autor: Alejandro I. Lazarte1, J. C. Ferreri2*

Fuente: http://www.scirp.org/



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