Abstract
Granular matter transported by hydraulic conveying behaves under several transport regimes. The techncal challenge is to predict the dilute or dense regime of transport as well as the pressure drop required in order to design properly a granular hydraulic conveying system. We address this problem with a laboratory scale experimental setup able to reproduce the key features of hydraulic conveying of grains. Pressure drop measurements as well as image analysis have been used to characterize a slug transport regime and its crossover towards a moving bed transport regime. A dimensionless characteristic curves diagram has been established and a reasonably good pressure drop prediction with a generic power law is explained in details. This preliminary work has the potential to open perspectives for the design of a predictive tool for pressure drops in hydraulic conveying systems.
Highlights
Transporting granular material is essential for a large range of industrial activities working from granulated raw material
The pressure drop measured during the hydraulic transport of particles exhibits a clear increase of approximately one order of magnitude compared to the pure liquid flow, see Fig. 2(a)
For hydraulic regimes where the entire sedimented bed is put in motion and moves with the flow, i. e. for I0 ≥ 5 mL.min−1, the pressure drop decreases with the flow rate
Summary
Transporting granular material is essential for a large range of industrial activities working from granulated raw material. Dtube tinuous supply with a powder, to the extraction of drill cuttings from a well [2], conveying grains techniques cover very different scales. Fluidization systems such as pneu- (a) matic or hydraulic conveying represent scientifically challenging problems due to the complex interaction between the suspending fluid phase and the granular phase [3]. Authors distinguish dilute regimes from dense regimes. The concentration of solid particles matters but as dilute regime are defined with rather homogeneous concentration of solid particles in the flow. Dilute regimes are by definition close to granular suspensions [7].
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