“Negative roughness” and polymer drag reduction

✍ Scribed by J. W. Hoyt

• Book ID: 104657126
• Publisher: Springer
• Year: 1991
• Tongue: English
• Weight: 380 KB
• Volume: 11-11
• Category: Article
• ISSN: 0723-4864
• DOI: 10.1007/bf00190290

✦ Synopsis

Based on an analogy to the Colebrook-White equation, a technique has been developed to allow polymer-solution extrapolation or "scaling" from one pipe size to another at constant values of AB. Each experimental data point can be transferred to a new pipe size by a simple, pocket-calculator method which preserves the experimental value of AB exactly. Thus scaling can be easily accomplished, without resorting to iteration or graphical techniques. The "negative-roughness" idea can also explain the loss of AB or drag reduction with increasing flow velocity.