Ammonia - Prandtl Number vs. Temperature and Pressure

Figures and table with changes in Prandtl number for ammonia with changes in temperature and pressure.

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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 ft²^oF/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:

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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

Ammonia phase diagram

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Ammonia - Prandtl Number vs. Temperature and Pressure

Figures and table with changes in Prandtl number for ammonia with changes in temperature and pressure.

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