The Reynolds Number Calculator can be used to help predict flow patterns in any kind of flow situation, from pipes and tubes to completely open channels Types of flows
The corresponding consideration must be made for the hydraulic diameter as well, since the wetted perimeter is determined by the river depth and distance between the two banks.
When the Reynolds number must be determined for wide ducts or open channels like rivers, we may consider the cross-sectional area (A) as the semicircle that is formed between the river banks and the river bed. Reynolds Number for ducts or open channels The hydraulic diameter is determined with: “ D H = 4A/P” where “P” is the “wetted perimeter”, or the area that contacts the fluid flow. When we are investigating the type of flow in a pipe, we use the formula: “Re = QD H/νΑ” where “ Q” is the fluid flow rate, “ D H” is the hydraulic diameter, “ ν” is the kinematic viscosity, and “ A” is the pipe cross-sectional area. This former of these formula’s drives the above Reynolds Number Calculator. The Reynolds Number formula is: “Re = VDρ/μ” or “Re = VD/v” where “ V” is the fluid velocity, “ D” is the characteristic distance, “ ρ” is the fluid density, “ ν” is the kinematic viscosity, and “ μ” is the dynamic viscosity both of which can be acquired from data tables.