Specific Gravity Of Particle Given Settling Velocity Calculator

Specific Gravity of Sediment Formula:

\[ G = \frac{(v_s)^2}{\left(\frac{4}{3} \cdot g \cdot D / C_D\right)} + 1 \]

Settling Velocity (v_s):

m/s

Acceleration due to Gravity (g):

m/s²

Diameter (D):

Coefficient of Drag (C_D):

Specific Gravity of Sediment (G):

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1. What is Specific Gravity of Sediment?

Specific Gravity of Sediment is the ratio of the density of sediment particles to the density of water. It provides important information about the relative weight of sediment particles compared to water.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ G = \frac{(v_s)^2}{\left(\frac{4}{3} \cdot g \cdot D / C_D\right)} + 1 \]

Where:

\( G \) — Specific Gravity of Sediment
\( v_s \) — Settling Velocity (m/s)
\( g \) — Acceleration due to Gravity (m/s²)
\( D \) — Diameter (m)
\( C_D \) — Coefficient of Drag

Explanation: This formula calculates the specific gravity of sediment particles based on their settling velocity, diameter, and drag characteristics in fluid.

3. Importance of Specific Gravity Calculation

Details: Calculating specific gravity of sediment is crucial for understanding sediment transport, erosion processes, and designing effective sediment control measures in hydraulic engineering.

4. Using the Calculator

Tips: Enter settling velocity in m/s, acceleration due to gravity in m/s² (default 9.8), diameter in meters, and coefficient of drag. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for specific gravity of sediment?
A: Most natural sediments have specific gravity values between 2.5-2.7, with quartz sand typically around 2.65.

Q2: How does particle shape affect the coefficient of drag?
A: Spherical particles have lower drag coefficients than irregularly shaped particles, which experience more resistance when settling.

Q3: Why is specific gravity important in sediment transport?
A: Specific gravity directly influences the settling velocity and transportability of sediment particles in flowing water.

Q4: Can this formula be used for all particle sizes?
A: The formula works best for spherical particles and may require adjustments for highly irregular shapes or very fine particles.

Q5: How does temperature affect the calculation?
A: Temperature affects water density and viscosity, which indirectly influence settling velocity and should be considered for precise calculations.