Kinematic Viscosity Given Power Loss Due To Leakage Of Fluid Through Face Seal Calculator

Formula Used:

\[ \nu = \frac{13200 \times P_l \times t}{\pi \times w^2 \times (r_2^4 - r_1^4)} \]

Power Loss For Seal (P_l):

Thickness of Fluid Between Members (t):

Nominal Packing Cross Section (w):

Outer Radius of Rotating Member (r₂):

Inner Radius of Rotating Member (r₁):

Kinematic Viscosity (ν):

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1. What is Kinematic Viscosity?

Kinematic Viscosity of Bush Seal Fluid is an atmospheric variable defined as the ratio between the dynamic viscosity μ and the density ρ of the fluid. It represents the fluid's resistance to flow under gravity.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \nu = \frac{13200 \times P_l \times t}{\pi \times w^2 \times (r_2^4 - r_1^4)} \]

Where:

\( \nu \) — Kinematic Viscosity of Bush Seal Fluid (m²/s)
\( P_l \) — Power Loss For Seal (W)
\( t \) — Thickness of Fluid Between Members (m)
\( w \) — Nominal Packing Cross Section of Bush Seal (m)
\( r_2 \) — Outer Radius of Rotating Member Inside Bush Seal (m)
\( r_1 \) — Inner Radius of Rotating Member Inside Bush Seal (m)
\( \pi \) — Archimedes' constant (approximately 3.1416)

Explanation: This formula calculates the kinematic viscosity based on power loss due to fluid leakage through a face seal, considering the geometric parameters of the sealing system.

3. Importance of Kinematic Viscosity Calculation

Details: Accurate kinematic viscosity calculation is crucial for designing efficient sealing systems, predicting fluid behavior in mechanical components, and minimizing power losses in rotating machinery.

4. Using the Calculator

Tips: Enter all values in appropriate SI units. Ensure that the outer radius is greater than the inner radius. All input values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between kinematic and dynamic viscosity?
A: Dynamic viscosity measures a fluid's resistance to flow when an external force is applied, while kinematic viscosity is the ratio of dynamic viscosity to density and represents resistance under gravity.

Q2: Why is kinematic viscosity important in seal design?
A: Kinematic viscosity affects fluid leakage rates, friction losses, and overall efficiency of sealing systems in mechanical applications.

Q3: What are typical units for kinematic viscosity?
A: The SI unit is m²/s, but Stokes (St) and centistokes (cSt) are also commonly used (1 St = 10⁻⁴ m²/s, 1 cSt = 10⁻⁶ m²/s).

Q4: How does temperature affect kinematic viscosity?
A: For most fluids, kinematic viscosity decreases as temperature increases. This temperature dependence is particularly important in sealing applications.

Q5: What factors influence power loss in seal systems?
A: Power loss is influenced by fluid viscosity, seal geometry, rotational speed, pressure differential, and surface roughness of sealing components.