Adapting the Forchheimer equation for the flow of air through wheat straw beds

The paper presents the results of an experimental investigation of air pressure drop while flowing through wheat straw beds. According to Darcy?s law, the smaller the porosity of the bed is, the bigger the pressure drop will be. The investigation was conducted using three different porosities (or th...

Full description

Saved in:
Bibliographic Details
Published in:Thermal science 2016, Vol.20 (suppl. 2), p.463-470
Main Authors: Doder, Djordjije, Miljkovic, Biljana, Stepanov, Borivoj, Pesenjanski, Ivan
Format: Article
Language:English
Subjects:
Air flow
Biomass burning
Flow velocity
Measurement methods
Permeability
Porosity
Porous media
Pressure drop
Tensors
Wheat
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The paper presents the results of an experimental investigation of air pressure drop while flowing through wheat straw beds. According to Darcy?s law, the smaller the porosity of the bed is, the bigger the pressure drop will be. The investigation was conducted using three different porosities (or three bed densities), and for two different air flow rates. After determining porosity (which is directly measurable), the permeability of straw could be found. For high flow velocities, such as the velocity of air flowing through a straw bale, the Forchheimer equation becomes more relevant as a correction of Darcy?s law with inertial effects included. Otherwise, the permeability tensor depends only on the geometry of the porous medium. With permeability known, the Forchheimer equation coefficients can be easily estimated. These results may be important for the future development of efficient biomass combustion facilities. The measurement methods and facility characteristics are described in more detail. nema
ISSN:0354-9836
2334-7163
DOI:10.2298/TSCI151005030D