Hold-up in multi-sized particulate solid-liquid flow through horizontal pipes

Hold-up is an important design parameter for pipelines transporting solid l iquid mixture as it correctly determines the bl situ volume fraction of dif ferent phases. Extensive experiments have been reported to establish the ef fect of solid concentration, flow velocity and particle size on hold-up. Ba sed on the data base, a simple correlation has been proposed for determinat ion of hold-up for multi-sized solid-liquid flow through pipes. The propose d correlation [HR = 1+ 0.64(W-0/ U*)(1.50)] incorporates the effect of all the factors affecting hold-up such as solid concentration, flow velocity, p article size, pipe diameter, etc. The predictions based on the proposed cor relation match reasonably well with the experimental data.