Oton Mazur

Some properties of boundary layer under the joint effect of external flow turbulence and surface roughness

Experimental investigation of the boundary layer development on the rough plate (80-grits sandpaper) under external turbulent flows with a grid turbulence of various turbulence scales proved existence of the laminar/transitional region, regardless the surface roughness. Both the outset and the length of the transitional region are affected by the external flow turbulence.

The Jet in Cross-Flow: A Few Remarks on the Cross-Flow Structure Influence

The results of an experimental investigation of the jet in cross-flow mixing zone are presented. The jet emanates perpendicularly from a circular nozzle in a wall with parallel cross-flow, and a jet to cross-flow velocity ratio of 4 is chosen. The cross-flow was of either low turbulence or high turbulence in nature. The influence of the turbulence level on structures arising in the mixing zone has been studied in detail.