OSBORN REYNOLD TRAINING SET
Reynolds applied this experiment to different cross-sections of the pipe and observed that the flow lines of the colored water remained intact in these sections, indicating that the flow moved along straight and parallel lines. When the flow velocity of the fluid increased, it was seen that after a certain velocity, the flow lines of the colored water disappeared and the entire water mass became colored. In other words, at high flow velocities, the particles forming the water do not move parallel along the pipe axis but also start to move radially within the pipe, resulting in complete mixing (i.e., turbulence). The fluid flow velocity at the moment the flow changes from one type to another is called the "critical velocity." In subsequent experiments, Reynolds examined the conditions under which these two flow types occur and found that the critical velocity depends on the pipe diameter, the fluid flow velocity, density, and absolute (dynamic) viscosity, and demonstrated that these four factors can be grouped in some way. The Reynolds number is of great importance in fluid mechanics and is widely used in engineering applications.
