Comparisons of analytical and experimental results are presented for the fluid jetting resulting from the existence of small gaps between parallel flow regions with dissimilar hydraulic characteristics. The experiment simulates the baffle gaps between a nuclear reactor core and the peripheral region around it, called the barrel-baffle region. Baffle gap fluid velocities are measured by a technique in which the only disturbance to the gap flow is a small pressure tap in the gap wall. The analysis uses an iterative, hydraulic network approach and is shown to yield good results when compared to the measured gap jet velocity and pressure drop distributions.