LDA measurements of coherent flow structures and cross-flow across the gap of a compound channel with two half-rods

•Cross-flow causes a peak in the stream-wise root mean square at the gap centre.•The stream-wise length of the coherent structures increases at low Reynolds.•The gap vortex streets are closer to the gap centreline for high Reynolds. The enhancement of heat transfer from fuel rods to coolant of a Liq...

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