Abstract
The development of empirical model for the hydraulic transport of sand-water mixtures is important for the design of economical solid-liquid transportation system in chemical and waste-disposal industries. The hydraulic transport characteristics of sand-water mixtures in circular pipelines are numerically investigated by using the FLUENT commercial software. Eulerian granular multiphase (EGM) model with the k-e turbulent model is used for the computation. Present method is validated by the computed values with the measured data. The effect of the concentration and pipe sizes on the relative solid effect is numerically investigated. It is found that the effect of the volumetric delivered concentration on both hydraulic gradient and solid effect increases as the Reynolds number decreases. When the Reynolds number is small, the increase in the volumetric delivered concentration has an effect of decreasing the hydraulic gradient whereas the solid effect increases with the volumetric delivered concentration stepping up. The effect of the pipe diameter is not the critical parameter for deciding the values of the relative solid effect in the sand-water mixture transportation.
Highlights
Solid-liquid flow in pipelines has been a popular mode of transportation in chemical and waste-disposal industries
Present method is validated by the computed values with the measured data
It is found that the effect of the volumetric delivered concentration on both hydraulic gradient and solid effect increases as the Reynolds number decreases
Summary
Solid-liquid flow in pipelines has been a popular mode of transportation in chemical and waste-disposal industries. Circular pipes are normally used for long distance transportation of variety of materials in bulk quantities [1]. Both time and pumping power required for hydraulically transporting huge amounts of soils in a state of slurry (sand-water mixture) are crucial factors for successful dredging and reclaiming projects [2]. During the several past decades, the complex computational scheme describing the microscopic processes in the solid-liquid flow and the computing costs has been a drawback to the development and use of commercial softwares. Lin and Ebadian [7] used a simplified three-dimensional algebraic slip mixture (ASM) model [8] and the RNC k-e turbulent model [9] while focusing on the developing process of volume of fraction and density distributions, mean velocity profiles
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