1. What is Mass Flow Rate in Thermodynamics?

Definition: Mass flow rate is the amount of mass passing through a given surface per unit time.

Purpose: It's crucial for designing and analyzing fluid systems, heat exchangers, and various thermodynamic processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Mass flow rate (pounds per hour)
• \( Q \) — Volumetric flow rate (gallons per minute)
• \( \rho \) — Density (pounds per gallon)
• 60 — Conversion factor (minutes to hours)

Explanation: The volumetric flow rate is multiplied by density to get mass per minute, then converted to hours.

3. Importance of Mass Flow Rate Calculation

Details: Accurate mass flow rate calculations are essential for system design, energy balance calculations, and process control in thermodynamics.

4. Using the Calculator

Tips: Enter the volumetric flow rate in GPM and density in lb/gal (default 8.34 for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 60 in the formula?
A: The factor converts minutes to hours since GPM is per minute and we typically want lb/hr.

Q2: What's a typical density for water?
A: Water at standard conditions is approximately 8.34 lb/gal.

Q3: Can I use this for gases?
A: This calculator is designed for liquids. Gases require different calculations accounting for compressibility.

Q4: How do I find volumetric flow rate?
A: Use flow meters or calculate from pipe diameter and velocity.

Q5: What units does this calculator use?
A: US customary units (GPM, lb/gal, lb/hr).