1. What is a Velocity to Mass Flow Calculator?

Definition: This calculator converts fluid velocity to mass flow rate using density and cross-sectional area.

Purpose: It helps engineers and technicians determine mass flow rates in piping systems based on velocity measurements.

2. How Does the Calculator Work?

The calculator uses two formulas:

Where:

• \( W \) — Mass flow rate (lb/hr)
• \( \rho \) — Density (lb/gal)
• \( Q \) — Volumetric flow rate (GPM)
• \( V \) — Velocity (ft/s)
• \( A \) — Cross-sectional area (ft²)

Explanation: First converts velocity to volumetric flow rate, then calculates mass flow rate using density.

3. Importance of Mass Flow Calculation

Details: Accurate mass flow calculations are essential for system design, process control, and equipment sizing in fluid systems.

4. Using the Calculator

Tips: Enter the fluid density in lb/gal, velocity in ft/s, and cross-sectional area in ft². All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 448.83 in the flow rate formula?
A: This converts ft³/s to GPM (gallons per minute) - 1 ft³/s = 448.83 GPM.

Q2: Why multiply by 60 in the mass flow formula?
A: This converts lb/min to lb/hr (60 minutes in an hour).

Q3: What's a typical density for water?
A: Water is approximately 8.34 lb/gal at room temperature.

Q4: How do I calculate cross-sectional area?
A: For circular pipes: \( A = \pi \times (D/2)^2 \) where D is diameter in feet.

Q5: Does this work for gases?
A: Yes, but gas density varies with pressure and temperature - use appropriate density values.