Multiphase Flow Analysis between Sand and Water in Horizontal Pipe and Bends
Date
2019-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Pulchowk Campus
Abstract
The deposition of impurities in pipelines is very common in various pipeline system
existing in different industries, hydropower plants. The study is an approach on developing
a model that predicts the sand particle behaviors in flowing water in closed pipelines. This
study involves Computational Fluid Dynamics (CFD)analysis and predicted flow behavior
in different conditions in a closed pipeline for sand (solid particles) and water(liquid) using
Eulerian-Eulerian multiphase flow model. The study was performed for pipe of diameter
0.3m, variable length, volume fraction (15%-35%), particles (0.02mm-0.06mm), velocity
(0.5m/s-2.5m/s).The results obtained were validated with the experimental data. Results
showed that maximum particle concentration increases with decrease in velocity, increase
in particle size and increase in volume fractions. The maximum concentration for inlet
mixture velocity of 0.5m/s and 2.5m/s velocity at outlet was found to be 0.626 and 0.515
respectively, and at midplane was found to be 0.629 and 0.498 respectively.The maximum
particle concentration for 15%, 25%, and 35% of initial mixture volume fraction was
0.586, 0.612 and 0.628 respectively at outlet and 0.536, 0.587and 0.629 at midplane
respectively.Maximum particle concentration for particle size of 0.02mm,0.04mm and
0.06mm are 0.307, 0.612 and 0.629 respectively at outlet and 0.349, 0.629, 0.629
respectively at midplane. Maximum particle concentration for 90° sharp bend, curved bend
of mean fillet radius 180mm and curved bend of mean fillet radius 210mm at bottom are
0.576, 0.476, and 0.466 respectively. Change in length of pipe didn’t have any effect on
concentration at certain point of pipe.
Description
The deposition of impurities in pipelines is very common in various pipeline system
existing in different industries, hydropower plants. The study is an approach on developing
a model that predicts the sand particle behaviors in flowing water in closed pipelines.
Keywords
Citation
MASTER OF SCIENCE IN ENERGY SYSTEM PLANNING AND MANAGEMENT