1. What Is the Flow Ratio?

Definition: The flow ratio (R) is a dimensionless number that compares the actual flow rate to the target flow rate in a system.

Purpose: It helps engineers and technicians evaluate how closely a system's actual performance matches its design specifications.

2. How Does the Flow Ratio Work?

The calculator uses the formula:

Where:

• \( R \) — Flow ratio (dimensionless)
• \( Q_{actual} \) — Actual flow rate (gallons per minute, GPM)
• \( Q_{target} \) — Target flow rate (gallons per minute, GPM)

Explanation: The ratio indicates whether the system is underperforming (R < 1), meeting expectations (R ≈ 1), or overperforming (R > 1).

3. Importance of Flow Ratio

Details: Monitoring flow ratio helps in system optimization, troubleshooting, and ensuring efficient operation of fluid systems.

4. Using the Calculator

Tips: Enter the actual measured flow rate and the designed target flow rate, both in GPM. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a flow ratio of 1 mean?
A: A ratio of 1 means the actual flow exactly matches the target flow rate, indicating perfect system performance.

Q2: What's an acceptable flow ratio range?
A: Typically 0.95-1.05 is acceptable, but this varies by application. Consult system specifications.

Q3: When would the flow ratio be greater than 1?
A: This occurs when the system is delivering more flow than designed, possibly due to incorrect pump sizing or reduced system resistance.

Q4: How do I measure actual flow rate?
A: Use flow meters, ultrasonic flow detectors, or other measurement devices appropriate for your system.

Q5: Does temperature affect flow ratio?
A: Temperature can affect fluid viscosity and density, which may impact actual flow rates, especially in precision systems.