Liquid Dielectric Constants

Overview

Engineering reference data for Liquid Dielectric Constants 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

Factors Affecting Dielectric Constant

The dielectric constant of a material is not fixed but can be influenced by several environmental and operational factors:

• Temperature: Most materials show changes in dielectric constant with temperature variations.
• Moisture levels: Absorbed moisture can significantly alter dielectric properties.
• Electrical frequency: The dielectric constant often varies with the frequency of the applied electric field.
• Part thickness: In some cases, the thickness of the insulating material can affect measurements.

Liquid Dielectric Constants

The table below provides dielectric constants for various liquids at specified temperatures. This data is valuable for selecting insulating materials in electrical applications, capacitors, and transformers.

Plastic Dielectric Constants

Dielectric constants for common plastic materials are typically given as ranges due to variations in composition and processing.

Interactive Charts

References

• Original Source