کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
670922 | 1459073 | 2010 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Criteria for the appearance of recirculating and non-stationary regimes behind a cylinder in a viscoplastic fluid Criteria for the appearance of recirculating and non-stationary regimes behind a cylinder in a viscoplastic fluid](/preview/png/670922.png)
The appearance of a recirculation zone and the formation of non-stationary vortices behind a cylinder in the unconfined flow of a Herschel–Bulkley fluid have been studied by numerical simulation. The Herschel–Bulkley constitutive equation was regularised by using the Papanastasiou model. Special attention was paid to determining the numerical parameters and comparing them to existing results. The influence of the Oldroyd number and power-law index on flow morphology and, in particular, on the unyielded zones was studied over a wide spectrum (0 ≤ Od ≤ 10) and (0.3 ≤ n ≤ 1.8). It was seen that the greater the Oldroyd number, the greater the critical Reynolds numbers and Strouhal number for the two flow regimes. The influence of the power-law index is more complex.
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 165, Issues 21–22, November 2010, Pages 1525–1535