Slurry transport, a study in continuity, fully stratified flow

S. A. Miedema*

*Corresponding author for this work

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

Abstract

In the past years a new slurry transport model has been developed, based on an extensive literature survey, 5 different flow regimes and a constant spatial volumetric concentration (in time and space). This model is named the Delft Head Loss & Limit Deposit Velocity Framework or DHLLDV. Since the previous WODCON in 2016 in Miami, DHLLDV has been modified and extended. The paper will describe the most important addition to DHLLDV. The most important addition is the criterion determining which of two models should be used, the heterogeneous flow regime model or the sliding flow regime model. The large particle model results in fully stratified flow for which Wilson determined a simple criterion, the particle diameter should be larger than 0.015 times the pipe diameter. Evidence for this criterion could not be found. Based on an old Bagnold criterion for the occurrence of suspension, a new criterion for fully stratified flow has been derived. Fully stratified flow is also named Sliding Flow in the DHLLDV Framework. Experimental data validating the transition between the two models is shown, also showing data for the heterogeneous flow regime and the homogeneous flow regime. The data matches the new development very well and proves the Wilson criterion is correct, but now with a physical basis. It is remarkable that this criterion does not seem to depend on the particle density or submerged density and hardly on the line speed.

Original languageEnglish
Title of host publicationProceedings 22nd World Dredging Congress
Subtitle of host publicationWODCON 2019
PublisherChinese Dredging Association (CHIDA)
Pages177-192
Publication statusPublished - 2019
Event22nd World Dredging Congress and Exposition, WODCON 2019 - Shanghai, China
Duration: 22 Apr 201926 Apr 2019

Conference

Conference22nd World Dredging Congress and Exposition, WODCON 2019
CountryChina
CityShanghai
Period22/04/1926/04/19

Keywords

  • Concentration distribution
  • Fully stratified flow
  • Sliding flow
  • Slurry transport

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