Rotational and axial flow through the gap between eccentric cylinders, of which the outer one rotates

This paper studies the pressure distribution around an inner cylinder and the pressure drop in the annular gap between eccentric cylinders, of which the outer one rotates and the inner one is stationary, under fully developed conditions. The relations between friction factor and a few parameters such as axial-flow Reynolds number, rotating Reynolds number, clearance ratio and eccentricity ratio, are investigated and compared with the previous results obtained for a rotating inner cylinder. The effect of axial-flow Reynolds number on the pressure distribution is investigated at some rotating Reynolds numbers, where the rotational flow without the axial one belongs to a laminar-flow region, either of transitional or turbulent type.