Title
Transient Slurry Flow Phenomena after Bends in the Vertical Plane: An experimental study and analysis into the origin and development of density waves within pipeline systems using a sedimentation and erosion unbalance model
Author
van der Voort, Tjalie (TU Delft Civil Engineering and Geosciences; TU Delft Hydraulic Engineering)
Contributor
van Rhee, C. (graduation committee)
Talmon, A.M. (graduation committee)
de Hoog, E. (mentor)
Degree granting institution
Delft University of Technology
Programme
Civil Engineering | Hydraulic Engineering
Date
2021-07-05
Abstract
Density waves inhibit the stability of (long) pipelines, which cannot be predicted using current day design tools. Density waves are formed due to an inverse relationship between sand eroding and settling in a pipeline. By designing and building a dedicated flow loop, an experimental study on how the erosion and sedimentation of sand in a pipe is influenced by particle size and concentration is conducted. Moreover, it is determined whether the erosion and sedimentation process can be modeled numerically using existing analytical pick-up functions. This could be applied for predicting density waves in horizontal pipelines.
From the experimental study it is found that at higher concentrations, the caterpillar-like movements of the bed, associated with the sedimentation and erosion unbalance at high concentrations, were observed more and more frequently. The influence of the mean grain size diameter can be characterised as the ability of the mixture to trigger amplifying density waves in the horizontal measurement section. Only the coarser sands used in the experiments were found to experience the sliding-stopping behaviour. Implementing different analytical pick-up functions to simulate the experimental study resulted in sufficiently accurate results. Depending on the pick-up function on how much calibration was required the measurements could be simulated adequately.
Subject
Density waves
Slurry
Mixture
Erosion
Hindered erosion
Two-Layer Model
Erosion-Sedimentation Unbalance
Experimental study
Slurry flow
Hindered sedimentation
To reference this document use:
http://resolver.tudelft.nl/uuid:25f4c9ef-8d12-4c89-a30c-d725479393f3
Embargo date
2024-07-05
Part of collection
Student theses
Document type
master thesis
Rights
© 2021 Tjalie van der Voort