کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
773161 | 1463315 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Deformation of bubbles in a highly viscous pipe flow
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The rheology of bubble-bearing magma is important in volcanic conduit flow. Its rheological properties strongly depend on the deformation of bubbles in highly viscous liquid. Here we conduct an experimental investigation on the deformation of bubbles in a Stokes pipe flow, in which the shear rate is non-uniform. The deformation of the bubbles in various shear rates is observed by high-speed photography. The deformed shape is classified using the capillary number, Ca, the ratio of viscous shear stress that promotes bubble deformation to surface tension that resist deformation. We find that the length of the elongated bubbles due to shear at Ca>1 is smaller than that in a simple shear field whose capillary numbers are equal to each other. In such a case, the bubbles have an asymmetric shape like the section of a two-dimensional airfoil with camber. Implication to the effective viscosity of the suspensions with such a wing-shaped bubble is briefly discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Dynamics Research - Volume 40, Issues 7â8, JulyâAugust 2008, Pages 576-584
Journal: Fluid Dynamics Research - Volume 40, Issues 7â8, JulyâAugust 2008, Pages 576-584
نویسندگان
M. Kameda, T. Katsumata, M. Ichihara,