|Yanuar||Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok 16424, Indonesia|
|Gunawan||Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok 16424, Indonesia|
|Dedih Sapjah||Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok 16424, Indonesia|
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/m3. 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%.
Drag reduction, Particle concentration, Pitch ratio, Silica slurry flow, Spiral pipe
Abulnaga, B., 2002. P.E :Slurry Systems Handbook: McGraw-Hill
Dean, B., Bhushan, B., 2010. Shark-skin Surfaces for Fluid-drag Reduction in Turbulent Flow: A Review. Phil. Trans. R. Soc, A., Volume 368, pp. 4775–4806
Kaushal, D.R., Sato, K., Toyota, T., Funatsu, Katsuya., Tomita, Y., 2005.
Effect of Particle Size Distribution on Pressure Drop and Concentration Profile in Pipeline Flow of Highly Concentrated Slurry. International Journal of Multiphase Flow, Volume 31(7), pp. 809–823
Pinto, T.C.S., Junior, D.M., Slatter, P.T., Leal Filho, L.S., 2014. Modeling the Critical Velocity for Heterogeneous Flow of Mineral Slurries. International Journal of Multiphase Flow, Volume 65, pp. 31–37
Ravelet, F., Bakir, F., Khelladi, S., Rey, R., 2013. Experimental Study of Hydraulic Transport of Large Particles in Horizontal Pipes. Experimental Thermal and Fluid Science, Volume 45, pp. 187–197
Watanabe, K., Kamoshida, T., Kato, H., 1988. Drag Reduction on Fly Ash Slurries in a Spiral Tube. Elsevier Science. Publishing Company, Inc., 693–700
Yanuar, N., Gunawan, I., Baqi, M., 2012. Characteristics of Drag Reduction by Guar Gum in Spiral Pipes. Journal Teknologi, Volume 58(2), pp. 95–99
Yanuar., Ridwan., Budiarso., Koestoer, R.A., 2009. Hydraulics Conveyances of Mud Slurry by a Spiral Pipe. Journal of Mechanical Science and Technology, Volume 23(7), pp. 1835–1839