Ammonia  Prandtl Number vs. Temperature and Pressure
Figures and table with changes in Prandtl number for ammonia with changes in 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} ^{o}F))
k = thermal conductivity (W/m K, Btu/(h ft^{2}^{o}F/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 GasLiquid Equilibrium pressure , Specific Heat (Heat Capacity) and Thermal Conductivity , and Thermophysical properties at standard conditions and Vapour pressure at gasliquid equilibrium ,
as well as Prandtl number of Air , Carbon dioxide , Methane , Nitrogen , Propane and Water .
Ammonia Prandtl number at gasliquid 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:
Temperature  Prandtl number at given pressures  
[K]  [°C]  [°F]  1 bara  10 bara  50 bara  100 bara 
200  73.2  8.6  2.67  2.67  2.69  2.72 
239.56  33.6  13.3  1.71(liq)  
239.56  33.6  13.3  0.881(g)  
298.05  24.9  45.8  1.30 (liq)  
298.05  24.9  45.8  1.18 (g)  
300  26.9  46.9  0.876  1.16  1.29  1.29 
362.03  88.9  81.4  1.41 (liq)  
362.03  88.9  81.4  1.84 (g)  
398.32  125  102  3.59 (liq)  
398.32  125  102  4.85 (g)  
400  127  102  0.857  0.894  1.11  3.24 
500  227  158  0.835  0.846  0.903  0.998 
600  327  214  0.855  0.860  0.883  0.913 
700  427  269  0.952  0.955  0.965  0.976 
Related Topics

Fluid Mechanics
The study of fluids  liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time. 
Material Properties
Properties of gases, fluids and solids. Densities, specific heats, viscosities and more. 
Thermodynamics
Work, heat and energy systems.
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