Ammonia - Prandtl Number vs. Temperature and Pressure

The Prandtl Number - Pr - is a dimensionless number approximating the ratio of momentum diffusivity (kinematic viscosity) to thermal diffusivity - and is often used in heat transfer and free and forced convection calculations.

The Prandtl number can for calculations be expressed as

Pr =  μ C_p / k                           (1)

where

μ = absolute or dynamic viscosity (kg/m s, lb_m/(ft h))

C_p = specific heat (J/kg K, Btu/lb_m^oF)

k = thermal conductivity (W/m K, Btu/(h ft^2oF/ft))

Below, Prandtl numbers for ammonia at varying temperatures and pressures are given in figures and table.

See also other properties of Ammonia at varying temperature and pressure: Density and specific weight, Dynamic and kinematic viscosity, Prandtl Number, Properties at Gas-Liquid Equilibrium pressure, Specific Heat (Heat Capacity) and Thermal Conductivity, and Thermophysical properties at standard conditions and Vapour pressure at gas-liquid equilibrium,
as well as Prandtl number of Air, Carbon dioxide, Methane, Nitrogen, Propane and Water.

Ammonia Prandtl number at gas-liquid equilibrium pressure, temperature given as °C or °F:

Ammonia Prandtl number at atmospheric pressure, temperature given as °C:

Ammonia Prandtl number at varying temperatures at given constant pressures, SI and Imperial units:

Ammonia Prandtl number at given temperatures and 1, 10, 50 and 100 bara presure:

Ammonia phase diagram