Reynolds Number Calculator

Reynolds number can be defined as the number which can be used to find out whether the flow is laminar or turbulent. The Reynold number is denoted by the letter R suffix e. The value of the Reynold number can be obtained by dividing inertial force with a viscous force that is Reynolds number = Inertial force / Viscous force. The formula is given as Re = pVL / u where p is given as the density of the fluid calculated in kg/m^3, V is the velocity of the fluid calculated in m/s, u is the viscosity which is calculated in N.s/m^2 and L is given as the length of the diameter of the fluid which is calculated in m.

Example 1: Find out the Reynolds number if a fluid has the viscosity as 0.5 N.s/m^2, density is 1000 kg/m^3 and the length

of the diameter of the pipe is 30 mm and velocity is 2.5 m/s.

For a given equation if the value of a variable is unknown, then the equation is solved in order to find the value of the variable.

The formula is given as Re = pVL / u

Re = 1000*2.5*30*10^-3/0.5

Re = 150

Hence the Reynolds number is 150

Example 2: Calculate the Reynolds number of a fluid passing through the pipe of diameter 10cm, the fluid has the viscosity

0.27 N.s/m^2 and density 900 kg/m^3 and it is flowing with the velocity of 3.8 m/s.

For a given equation if the value of a variable is unknown, then the equation is solved in order to find the value of the variable.

The formula is given as Re = pVL / u

Re = 900*3.8*10*10^-2/0.27

Re = 1266.67

Hence the Reynolds number is 1266.67

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