The application of the Ergun equation to predict the expansion of filter media during backwashing is investigated. Fluidization data from the literature have been analyzed and the values k1=3.519 and k2=0.266 have been found to give a very good fit to the data in the range of Reynolds numbers of interest in filter backwashing. An empirical equation that is applicable over a wider range of Reynolds numbers than the Ergun equation is also developed. New experiments have been carried out with glass spheres, plastic spheres, silica sand, and crushed glass. The effect of particle shape on expansion behaviour is investigated. It is found that the influence of particle shape is larger than previously recognized. Furthermore, the shape effect depends on the Reynolds number based on the backwash velocity. The advantages, limitations, and range of applicability of each method of calculation are delineated.
Skip Nav Destination
Article navigation
Research Article|
December 01 2004
Prediction of filter expansion during backwashing Available to Purchase
Ö. Akgiray;
*Marmara University, Faculty of Engineering, Department of Environmental Engineering, Goztepe 34722, Istanbul, Turkey (E-mail: [email protected])
E-mail: [email protected]
Search for other works by this author on:
E. Soyer;
E. Soyer
**Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, Maslak 80626, Istanbul, Turkey (E-mail: [email protected])
Search for other works by this author on:
E. Yüksel
E. Yüksel
**Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, Maslak 80626, Istanbul, Turkey (E-mail: [email protected])
Search for other works by this author on:
Water Supply (2004) 4 (5-6): 131–138.
Citation
Ö. Akgiray, E. Soyer, E. Yüksel; Prediction of filter expansion during backwashing. Water Supply 1 December 2004; 4 (5-6): 131–138. doi: https://doi.org/10.2166/ws.2004.0101
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00