Contribution of Perforated Pipe Roughness to Improve Sediment Transport in Hybrid Fluidization Method as an Alternative Dredging Technique

Abstract

The slurry discharge (Qs) through the pump is made possible by the roughness of the perforation pipe during the dredging technique with the hybrid fluidization method. This study purposes to find the relationship between pipe roughness formed based on the physical parameters of the hole (Df/a) expressed through the equation of Darcy friction factor (fD) to the value of Reynold (Re) and Qs. Physical simulations in the laboratory with sediment variations in characteristics (ρ, d50), sediment thickness over the fluidization pipe (db), and variations in perforation hole spacing (a), and constant hole diameter (Df) were the experimental sets used. The dimensionless analysis method was used to analyze the correlation between flow parameters (vt/v) and the physical parameters of the pipe (Df/a). The fD equation was utilized by Colebrooke and Haaland to analyse the pipe's roughness in relation to the flow condition, which resulted in the formation of the friction relationship (f), k/D, and Re. The results of the analysis found the relationship between the ratio of vt/v and Df/a had a positive impact on the sediment transport process around the perforation pipe which resulted in a friction that was expressed as fD equation. The fD equation has been developed in an experimental and gives an empirical equation ( ) is a theoretical contribution to the developed simple dredging technology. The empirical equation fD finding the relationship of the slurry discharge and the darcy friction factor by meeting the criteria of the physical parameters of the perforation hole (Df/a).

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