Nitrogen N2 Thermal Diffusivity Temperature Pressure

Overview

Engineering reference data for Nitrogen N2 Thermal Diffusivity Temperature Pressure in fluid mechanics.

Key Formulas

Reynolds Number

$Re = \frac{\rho v D}{\mu}$

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

$P + \frac{1}{2}\rho v^2 + \rho g h = \text{const}$

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

$A_1 v_1 = A_2 v_2$

Conservation of mass for incompressible flow.

Darcy-Weisbach

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Pressure drop due to friction in a pipe.

Variables

Symbol	Description	Unit
$Re$	Reynolds number	—
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s
$D$	Characteristic dimension	m
$\mu$	Dynamic viscosity	Pa·s
$P$	Pressure	Pa
$f$	Darcy friction factor	—

Definition and Formula

Thermal diffusivity (α) quantifies the rate at which heat propagates through a material. It is defined as the ratio of thermal conductivity (k) to the product of density (ρ) and specific heat capacity at constant pressure (C_P).

$\alpha = \frac{k}{\rho C_P}$

Where:

• α = thermal diffusivity (m²/s)
• k = thermal conductivity (W/(m·K))
• ρ = density (kg/m³)
• C_P = specific heat capacity at constant pressure (J/(kg·K))

Unit Conversion Factors

The following conversion factors are applicable for thermal diffusivity:

• 1 ft²/h = 2.7778×10⁻⁴ ft²/s = 0.09290 m²/h = 2.581×10⁻⁵ m²/s
• 1 ft²/s = 3600 ft²/h = 334.45 m²/h = 0.09290 m²/s
• 1 m²/h = 2.7778×10⁻⁴ m²/s = 10.7639 ft²/h = 0.002990 ft²/s
• 1 m²/s = 3600 m²/h = 38750.1 ft²/h = 10.7639 ft²/s

Thermal Diffusivity at Atmospheric Pressure

Thermal Diffusivity vs. Temperature and Pressure

Interactive Charts

References

• Original Source