drag-reducing ability after a period of continuous circulation. The effect of various metal ions and compounds on the viscoelas-The effective time varied from a few days to tens of days, ticity of a 12.5/5 m M sodium salicylate (NaSal)/tris(2-hydroxydepending on the components present in the loop. T
Experimental study on the effects of shear induced structure in a drag-reducing surfactant solution flow
β Scribed by Hongxia Zhang; Dezhong Wang; Hanping Chen
- Publisher
- Springer
- Year
- 2008
- Tongue
- English
- Weight
- 355 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0939-1533
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A second-order finite difference scheme was employed for the DNS study of drag-reducing flow with surfactant additives. We focus on the effect of Weissenberg number (nondimensional relaxation time) on the flow structures. The instantaneous flow structures and stress distribution at different elastic
The turbulent frictional drag of water can be reduced dramatically by adding small amounts of drag-reducing materials, such as polymers or surfactants. As a percentage drag reduction of 80% can easily be achieved, this technique is thought to be the most practical method of reducing turbulent fricti