Gravitational Settling Chambers

Front

Gravitational settling chambers are used to remove particles from gas streams by allowing them to settle due to gravity.

Back

Front

Diagram of a Gravitational Settling Chamber showing gas flow, inlet and outlet baffles, and dimensions (W, H, L).

Back

Front

Gravitational settling chambers have a cross-sectional area that is much larger than the ducts approaching or leading away from it.

Back

This design reduces the gas velocity inside the chamber compared to the ducts.

Front

Baffles are used in gravitational settling chambers.

Back

They spread the incoming flow evenly across the chamber to improve particle collection.

Front

Without baffles, the flow in a settling chamber results in poor particle collection.

Back

Most of the flow goes through the middle, resulting in poor particle collection.

Front

A particle enters the chamber at a height h above the floor.

Back

Height of the particle above the floor is h.

Front

Time to traverse the chamber is given by t = L/V_{avg}.

Back

The length of time the gas parcel takes to traverse the chamber in the flow direction.

Front

Vertical settling distance formula: Vertical settling distance = tVₜ = Vₜ (L / V_avg)

Back

The formula for vertical settling distance is used to calculate the distance a particle settles by gravity over time.

Front

Fraction captured formula: Fraction captured = η = LVₜ / (H V_avg) for block flow

Back

Front

Uniform distribution and size assumption of particles.

Back

Uniform distribution and size assumption of particles help in calculating fractional collector efficiency.