Lapple cyclone

Description

The Lapple cyclone is a widely used device for separating solid particles from gases through centrifugal force. It provides a simplified yet effective model to estimate separation efficiency, pressure drop, and power requirements in ventilation and exhaust systems.

Lapple Cyclone Lapple Cyclone

Available calculation methods:

Dimensions – computes main geometric parameters, cut diameter, pressure drop, and power.
Granulometric curve – generates the grade efficiency curve as a function of particle size.
Granulometry from the cyclone diameter – calculates the outlet granulometric distribution based on the cyclone diameter.
Granulometry from the diameter cut – estimates outlet granulometric distribution using a predefined cut diameter.

Inputs and outputs of the dimension calculation

Inputs

Parameter	Default units	Description
Cyclone diameter ( $dc$ )	m	Main dimension of the cyclone
Particle density ( $\rho_p$ )	kg/m³	Solid particle density
Air flow ( $Q$ )	m³/s	Volumetric airflow
Air density ( $\rho$ )	kg/m³	Carrier fluid density
Air viscosity ( $\mu$ )	Pa·s	Dynamic viscosity of air
Blower efficiency ( $\eta$ )	%	Efficiency of the fan

Outputs

Parameter	Default units	Description
Cut diameter ( $d_p$ )	m	Particle diameter at 50% collection efficiency
Head loss ( $\Delta P$ )	Pa	Pressure drop across the cyclone
Power ( $P$ )	W	Power required for operation
L1, L2, L3	m	Characteristic heights of the cyclone
W	m	Inlet width
Dd	m	Discharge duct diameter
H	m	Cylindrical body height
De	m	Exit diameter

Calculations

Input data

Output data

Input data

Diameter cut

Minimum particle diameter to be plotted

Maximum particle diameter to be plotted

Graph points

Output data

Graph

Efficiency values

Particles size ratio

Input data

Output data

Input data

Output data

Description

Inputs and outputs of the dimension calculation

References