Developments in the design of installations for pneumatic transport
Report 2007.TEL.7145, Transport Engineering and Logistics.
Pneumatic transport in bulk solid handling is transporting small particles
in a pipe. In this pipe there is an airflow which has higher speeds than the
particles themselves and the friction of air will propel the particles.
In 1982 a thesis is written about a model that calculates pressure losses in
dilute phase pneumatic transport [J.A. Ottjes "Pressure losses
in pneumatic transport. " A model based on particle-wall interactions
and particle density distribution", PhD-thesis TU Delft (1982)]
In this report an overview is presented of the developments since 1982 in
dilute phase transport models.
A literature study has been done to collect information about pressure loss
calculations, particle forces and effects of particle properties that are
used after 1982.
There are five pressure loss model found.
The traditional methods to calculate pressure drop are still being used. The
effects of particle properties are investigated by researchers by using
computer models or measurement results.
- A calculation using correlation coefficients based on phase diagrams
- The total friction factor model, which is a darcy gas model with the
mixture being modelled as one gas.
- The air and solids friction factor, which is the gasmodel with two
seperate parts, one of gas properties and the other of solids properties
- The granular theory, this is a 1D-model with the particle pressure drop
based on the kinetic gas theory.
- The computer models: Discrete Element Modelling and Computional Fluid
Dynamics, these models calculates pressure drop using numerical particles
or finite volume units.
Reports on Transport Engineering and Logistics (in Dutch)
, TU Delft