The influence of local hindered settling on the concentration distribution in slurry transport

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

For determining the concentration distribution in slurry transport in pipes, often the solution of the 2D advection diffusion equation is used. The solution contains the terminal settling velocity, which is often replaced by the global hindered settling velocity, based on the cross sectional averaged spatial volumetric concentration. The fact that a concentration distribution is determined implies that the local concentration depends on the vertical coordinate in the pipe and is not equal to the cross sectional averaged concentration. With CFD this influence can be determined, however it’s interesting to see if there is also an analytical solution to this. The paper describes this analytical model based on local concentration. The method is iterative and requires about 4-12 iterations to find a stable solution. The hindered settling equation of Richardson and Zaki is modified to find a correct hindered settling velocity for high concentrations. In fact, if the spatial concentration approaches 50% one cannot speak of hindered settling anymore, but its closer to consolidation. The new equation behaves according to Richardson & Zaki for small concentrations and to consolidation for large concentrations. The model is validated with measured concentration profiles from literature, which will be shown.
Original languageEnglish
Title of host publicationProceedings 18th International Conference on Transport and Sedimentation of Solid Particles (T&S 2017)
EditorsV Matousek, J Sobota, P Vlasak
Place of PublicationWroclaw, Poland
PublisherWroclaw University of Environmental and Life Sciences
Pages225-232
ISBN (Print)978-83-7717-269-8
Publication statusPublished - 2017
EventT&S 2017: 18th International Conferences on Transport and Sedimentation of Solid Particles - Prague, Czech Republic
Duration: 11 Sep 201715 Sep 2017
Conference number: 18
http://c6.aqua.up.wroc.pl/ts18/

Conference

ConferenceT&S 2017: 18th International Conferences on Transport and Sedimentation of Solid Particles
Abbreviated titleT&S 2017
CountryCzech Republic
CityPrague
Period11/09/1715/09/17
Internet address

Keywords

  • slurry transport
  • concentration distribution
  • hindered settling

Fingerprint Dive into the research topics of 'The influence of local hindered settling on the concentration distribution in slurry transport'. Together they form a unique fingerprint.

Cite this