Dimensionless numbers
The examples below demonstrate various dimensionless number functions availabe in chemics.
Reynolds number
Use the reynolds()
function to calculate the Reynolds number.
u = 2.6 # flow speed in m/s
d = 0.025 # characteristic length or dimension in meters
rho = 910 # density of the fluid or gas in kg/m³
mu = 0.38 # dynamic viscosity of the fluid or gas in kg/(m⋅s)
re = cm.reynolds(u, d, rho=rho, mu=mu)
print(f'Reynolds number Re is {re:.2f}')
Reynolds number Re is 155.66
The kinematic viscosity can be used as an input parameter instead of the density and dynamic viscosity.
u = 0.25 # flow speed in m/s
d = 0.102 # characteristic length or dimension in meters
nu = 1.4e-6 # kinematic viscosity of the fluid or gas in m²/s
re = cm.reynolds(u, d, nu=nu)
print(f'Reynolds number Re is {re:.2f}')
Reynolds number Re is 18214.29