Ethylene Ethene Acetene C2H4 Dynamic Kinematic Viscosity Temperature Pressure

Overview

Engineering reference data for Ethylene Ethene Acetene C2H4 Dynamic Kinematic Viscosity 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	—

Ethylene Viscosity Data

Ethylene (ethene, C₂H₄) exhibits distinct viscosity behavior between its liquid and gas phases. The atmospheric boiling point of ethylene is -104 °C (-155 °F), which corresponds to a significant shift in viscosity at that temperature.

Viscosity Trends

Liquid ethylene: Dynamic viscosity decreases with increasing temperature — from 685.7 μPa·s at 104 K to 40.40 μPa·s at 275 K. This is characteristic of liquids, where higher thermal energy reduces intermolecular resistance to flow.

Gaseous ethylene: Dynamic viscosity increases with increasing temperature — from 0.773 μPa·s at 104 K to 13.77 μPa·s at 275 K. This behavior is typical for gases, where higher molecular velocities enhance momentum transfer between layers.

Dynamic Viscosity Unit Conversions

The following conversions are commonly used when working with ethylene viscosity data:

Unit	Equivalent
1 cP (centipoise)	0.001 Pa·s = 0.01 P = 0.01 g/(cm·s) = 6.72197×10⁻⁴ lb/(ft·s) = 2.4191 lb/(ft·h)
1 lb/(ft·h)	0.00027778 lb/(ft·s) = 0.00041338 Pa·s = 0.0041338 P = 0.41338 cP
1 lb/(ft·s)	3600 lb/(ft·h) = 1.48816 Pa·s = 14.8816 P = 1488.16 cP
1 kg/(m·s)	1 Pa·s = 1 (N·s)/m² = 10 P = 1000 cP = 0.672197 lb/(ft·s) = 2419.09 lb/(ft·h)

Kinematic Viscosity Unit Conversions

Unit	Equivalent
1 cm²/s	1 St (Stokes) = 100 cSt = 1×10⁻⁴ m²/s = 1.07639×10⁻³ ft²/s
1 cSt (centistokes)	1 mm²/s = 1×10⁻⁶ m²/s = 1.07639×10⁻⁵ ft²/s
1 ft²/s	3600 ft²/h = 0.09290304 m²/s = 92903.04 cSt
1 ft²/h	2.7778×10⁻⁴ ft²/s = 2.58064×10⁻⁵ m²/s = 25.8064 cSt

Related Ethylene Properties

For a complete understanding of ethylene thermophysical behavior, refer to the following companion pages:

• Density and Specific Weight — varies significantly near the boiling point
• Specific Heat (Heat Capacity) — temperature-dependent energy storage
• Thermal Conductivity — heat transfer characteristics

Interactive Charts

References

• Original Source