Titlebook: Viscous Drag Reduction; Proceedings of the S C. Sinclair Wells Conference proceedings 1969 Springer Science+Business Media New York 1969 re

調(diào)情

Turbulent Skin Friction of Dilute Polymer Solutions in Rough Pipestive in smooth than in rough pipes. For example, addition of 500 wppm of CMC reduced drag in the smooth pipe system by 19.3 percent at a Reynolds number of 5 × 10., whereas in the roughest pipe tested drag was reduced only 1.4 percent.

彩色的蠟筆

Contrasts in the Solution Drag Reduction Characteristics of Polymeric Solutions and Micellar Systemsistics are discussed in detail. The morphology of micellar-type drag reducer systems is also discussed, and estimates are presented of morphological parameters for conditions corresponding to the threshold shear stress where maximum drag reduction activity occurs.

parallelism

飛鏢

Boundary-Layer Tripping with Emphasis on Hypersonic Flowsre drag of the trip is investigated at local Mach numbers of 4.7 and 5.5. Based on test results, a flow model was constructed which includes trip-produced multiple vortex filaments similar to those found at supersonic speeds that are assumed to be responsible for introducing the disturbances that le

dialect

Ballistics Range Boundary-Layer Transition Measurements on Cones at Hypersonic Speeds the boundary-layer transition on conical bodies. The parameters investigated include Mach number, cone angle, nose bluntness, and ratio of wall-to-recovery temperature. The tests were conducted on 3-, 5-, 6.3-, and 9-degree half-angle cones. The test Mach number varied from 3 to 15, and the ambient

落葉劑

Stable-Angina

The Onset of Dilute Polymer Solution Phenomenaent pipe flow is reviewed and the observed effects of flow and polymeric parameters summarized. Theoretical approaches to pipe flow onset are analysed and three types of onset hypotheses are evaluated against experimental data. A semi-empirical correlation is presented for onset in pipes. Onset resu

Celiac-Plexus

infinite

Turbulent Skin Friction of Dilute Polymer Solutions in Rough Pipesd roughened with silicon carbide particles in 60, 100, and 120 grit sizes. Each pipe system was tested with polymer concentrations of 0, 100, 250, and 500 ppm of CMC by weight..The results show that flow properties are extensively influenced by polymer addition and surface roughness. In the transiti

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