| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Research Abstract |
Many attempts to date have been directed to develop a relationship for the prediction of the hydraulic gradient im in heterogeneous flow of settling slurry having coarse solid particles. This fact indicates clearly that existing correlations lack the universality, and often provide poor im prediction results due to the great diversity of flow conditions.
In this study a heterogeneous suspensions model was developed for the flow simulation and scale-up of slurry pipelines in the deposit regime. Our analytical work has three main steps: In the first part, the relationship between the in situ concentration and the delivered concentration was derived, and solved mathematically. Secondly, the mean velocity-hydraulic gradient correletion was determined in treory. The purpose of the third stop research was to derive the general correlation which determine the relationship between the bed thickness and the corresponding flow condition
The predictions for the concentration distributions and hydraulic gradient from the model were in good agreement with experimental results taken from the published literature for a variety of flow conditions of slurries. Based on the above analyses, we also discussed specific energy, Batchelor's dimensionless number, and Durand-Condolios equation.
As a result, it was confirmed that in the design of slurry pipelines for the commercial transportation of any materials our study made possible to predict the hydraulic gradients and the bed thicknesses precisely in the deposit regime without laboratory flow loop tests.
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