### Characteristics of Silica Slurry Flow in a Spiral Pipe

*Yanuar Yanuar, Gunawan Gunawan, Dedih Sapjah*

**Abstract**:

Silica

sand slurry is a multiphase flow that consists of liquid and

particle solids. Slurry flow characteristics are affected by particle size,

particle distribution, particle concentrate, pipe geometry, flow regime, and

viscosity factors. Spiral pipe is one of the

solutions to increase drag reduction at a certain velocity and Reynolds

number (Re). The aim of this experiment is to figure out the

influence of using spiral pipe in increasing drag reduction of silica sand

slurry flow. The pipeline used is spiral pipe with a helicial tape with two ratios of pitch per diameter (p/D), i.e.

= 4 and 7. The test loop is set up as 3,500 mm (3.5 meters) in

length. The size of the particle is 1 mm in diameter. The mean density of the

silica sand particles is 2,300 kg/m^{3}. The

velocities are set between 1m/second and 5m/second. The percentage of volumetric concentration of solids in slurry (Cw)

varies between 20%,

30%, and 50% in weight. Particle concentration, the Reynolds number and ratio of pitch and diameter give

significant impact to the drag reduction. At a ratio of pitch/diameter (p/Di) = 7, at a Reynolds number (Re) of 30,000 and at Cw 50% can increase drag

reduction to about 33%.

**Keywords**: Drag reduction; Particle concentration; Pitch ratio; Silica slurry flow; Spiral pipe

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