Experimental study of submerged hydraulic jumps generated downstream of rectangular plunging jets

This experimental study analyzes submerged hydraulic jumps generated in a 1.05-m wide stilling basin that receives overflow rectangular impinging jets, with the vertical distance between sharp-crested weir and bottom of plunge pool being 2.20 m. Five downstream non-developed nappe jets were analyzed, falling distances to break-up length ratios 0.76 0.78. The impingement velocity range was from 6.12 6.33 m/s, while water depth / jet thickness 8.45 15.00. field air entrapped measured several cross sections, farthest sections located 1.0 m stagnation point. (void fraction phase change detection) behavior phase-detection probe classified as function point ratio and/or mean void profiles. maximum fractions observed near free surface. However, higher detection frequencies (up 130-140 Hz) obtained for local smaller than 0.15-0.20. non-dimensional distribution seems be similar previous published studies, extending their validity range. Furthermore, formula has been adapted estimate rate shear stress layer growth characteristic pool.