1. What is the Pressure Change Formula?

The pressure change formula calculates the differential pressure in fluid systems based on incremental length, viscosity, velocity, and seal radius. It's particularly useful in seal design and leakage analysis in mechanical systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \Delta p \) — Pressure change (Pa)
• \( dl \) — Incremental length in direction of velocity (m)
• \( \mu \) — Absolute viscosity of oil in seals (Pa·s)
• \( v \) — Velocity (m/s)
• \( rs \) — Radius of seal (m)

Explanation: This formula describes the relationship between pressure drop and various fluid and geometric parameters in seal systems.

3. Importance of Pressure Change Calculation

Details: Accurate pressure change calculation is crucial for seal design, leakage prevention, and ensuring proper functioning of hydraulic and pneumatic systems.

4. Using the Calculator

Tips: Enter all values in appropriate SI units. Ensure all inputs are positive values for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the 8 in the formula?
A: The constant 8 comes from the derivation of the formula for pressure drop in circular conduits and is specific to this particular flow configuration.

Q2: How does viscosity affect pressure change?
A: Higher viscosity fluids create greater resistance to flow, resulting in higher pressure drops for the same flow conditions.

Q3: Why is seal radius squared in the denominator?
A: The radius appears squared because the cross-sectional area through which flow occurs is proportional to the square of the radius.

Q4: What are typical viscosity values for seal oils?
A: Viscosity values typically range from 0.01 to 1.0 Pa·s depending on the specific oil and operating temperature.

Q5: When is this formula most applicable?
A: This formula is most applicable for laminar flow conditions in seal gaps and small clearances where the flow is well-defined.