Bioinspired Universal Approaches for Cavity Regulation during Cylinder Impact Processes for Drag Reduction in Aqueous Media: Macrogeometry Vanquishing Wettability

Novel and Enviromentaly Friendly Mechanical Technique to Improve the Flow in Water Pipelienes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.3029 ◽

2011 ◽

Vol 347-353 ◽

pp. 3029-3035

Author(s):

Hayder A. Abdulbari ◽

Rosli Bin Mohd Yunus ◽

Zulkafli Bin Hassan ◽

Wafaa Kamil Mahmood ◽

C Hooi

Keyword(s):

Experimental Investigation ◽

Stainless Steel ◽

Shear Stress ◽

Fluid Flow ◽

Drag Reduction ◽

Stress Reduction ◽

Aqueous Media ◽

Turbulent Channel Flow ◽

Friction Drag ◽

Set Up

The paper is concerned with an experimental investigation of the drag reduction in turbulent channel flow over the mechanical chain. A circulating loop for the fluid flow with 0.0381 inside diameter of pipe is set up. The testing length of the system is 1.5m.Wall shear stress reduction performance has been investigated experimentally for various design geometry surfaces including a replica of bent consisting of stainless steel model scales. Attempts to optimize the net drag reduction by varying the design geometry and alignment are also discussed. The study indicated that the mechanical chain taken in water flow is capable to decrease the friction drag of a turbulent flow up to 40%. The maximum percentage was achieved in 39.37L/D at RE equal to 56733. The results show that a substantial drag reduction can be achieved by this mechanical chain in aqueous media.

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Glycolic Acid Ethoxylate 4-Tert-Butylphenyl Ether as Drag Reducing Agent in Aqueous Media Flow

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.297-301.40 ◽

2010 ◽

Vol 297-301 ◽

pp. 40-45

Author(s):

Hayder A. Abdul Bari ◽

Emma Suali ◽

Zulkafli Bin Hassan

Keyword(s):

Turbulent Flow ◽

Drag Reduction ◽

Experimental Work ◽

Anionic Surfactant ◽

Glycolic Acid ◽

Anionic Surfactants ◽

Aqueous Media ◽

Reducing Agent ◽

Pipe Length ◽

Flow Rates

Glycolic acid ethoxylate 4-tert-butylphenyl ether was used as investigated anionic surfactants in this experimental work. A built up rig with ratio of pipe length to diameter (L/D) is equal to 59 was used to achieve the purpose of this work which is to investigate the drag reduction in turbulent flow with different flow rates and concentration of additive. In the present study, the concentrations (ppm) of additive were analyzed starting from 200, 300, 400, 500 and 600, respectively. The flow rates (Re) of the solution were from 11235, 22470, 33705, 44940, 56175, 67410 and 78645, respectively. It was found that glycolic acid ethoxylate 4-tert-butylphenyl ether is capable to reduce the drag less than 10 %. The highest drag reduction is 8 % was achieved in 600 ppm of solution for turbulent flow with Re within the range 44940 to 56175. The results of experimental work shows that this anionic surfactant perform as a poor drag reducing agent due to its drag reduction values increases only 1 to 3 % even though the concentration of solution was added about 100 ppm. This occurred probably because of the formation of micelle in the solution which is not in a fully threadlike forms and the micelle networks are not fully established in solution to surpassed the degree of turbulent flow.

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Cocoa Husk Waste Mucilage as New Flow Improver in Pipelines

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.312-315.1063 ◽

2011 ◽

Vol 312-315 ◽

pp. 1063-1067 ◽

Cited By ~ 1

Author(s):

Hayder A. Abdulbari ◽

K.H. Hamad ◽

Rosli Bin Mohd Yunus

Keyword(s):

Drag Reduction ◽

Power Dissipation ◽

Aqueous Media ◽

Environmentally Friendly ◽

Reynolds Numbers ◽

Internal Diameter ◽

Fluid Velocities ◽

Maximum Drag Reduction ◽

Flow Improver ◽

Reduction Percentage

Liquid transportation through pipelines for very long distances is one of the most power consuming sectors in the industry. Synthetic polymers were used as flow improvers for many years to solve the power dissipation problem. These polymers are toxic and expensive. An environmentally friendly and more natural product that can replace the usage of polymers as flow improvers is needed. The present study focused on a new, cheap, natural and environmentally friendly flow improver that was extracted from the cocoa husk wastes. Mucilage was prepared from the cocoa husk waste and tested in aqueous media at concentrations between 100 ppm and 400 ppm using pipes with an internal diameter of 0.0125, 0.0254 and 0.0381 m and five different fluid velocities represented by the corresponding Reynolds Numbers (Re). It was found that the cocoa husk mucilage was an effective drag reducing agent. A maximum drag reduction percentage of 44% could be achieved by adding as little as 400 ppm of mucilage. Drag reduction was found to increase by increasing Reynolds Numbers, additive concentrations and pipe lengths. It also increased with decreasing pipe diameters.

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