AR channel aspect ratio

Dh, D hydraulic diameter e rib height h heat transfer coefficient k thermal conductivity of coolant

Nu local Nusselt number, hD/k

Nuo Nusselt number in fully-developed turbulent non-rotating tube flow, hD/k

Pr Prandtl number

Re Reynolds number, pWbDh /m

Ro rotation number, WDh/Wb

Rr radius from axis of rotation

S streamwise distance

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