Target Flow Meters

Overview

Engineering reference data for Target Flow Meters 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	—

Advantages of Target Flow Meters

• Suitable for any type of liquid, gas, or steam, including cryogenic applications.
• No moving parts, such as bearings, minimizes wear and enhances reliability.
• Demonstrated high reliability with life tests reaching up to 20,000,000 cycles.
• Compatible with line sizes from 0.5 inches and upward, supporting various mounting configurations.
• Allows easy range or fluid changes by simply swapping the target.
• Approximately 15:1 turndown ratio.
• Supports bi-directional flow, with direction indicated by signal polarity.
• Available in materials like 303/304 SS, 316 SS, Hastelloy, and Inconel for corrosion resistance and durability.

Disadvantages of Target Flow Meters

• Calibration must be verified in the field, which may require additional setup and validation efforts.

References

• Original Source