Vibrational flow of non-Newtonian fluids

✍ Scribed by N.S Deshpande; M Barigou

• Book ID: 108309926
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 151 KB
• Volume: 56
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/s0009-2509(01)00059-8

✦ Synopsis

The ow of a time-independent uid through a vibrated tube is studied both numerically by CFD simulation and experimentally. The e ects are studied for Newtonian and non-Newtonian uids which obey Bingham plastic, power-law or Herschel-Bulkley behaviour. The superimposed mechanical oscillations have no e ect on the ow of Newtonian uids, but can greatly in uence that of shear-dependent uids. Flow enhancement is obtained with shear-thinning uids whereas ow reduction occurs when a shear-thickening uid is vibrated. The e ects of the various rheological parameters are investigated, and the ow behaviour index emerges as the most in uential. The enhancement is a function of both vibration frequency and amplitude, but the same enhancement is generated with di erent amplitude-frequency combinations that correspond to the same peak acceleration. The CFD predictions are in both qualitative and quantitative agreement with experimental measurements.