Flow behavior of Cellulose Nano Fiber Suspension in Planar Channels with an Abrupt Contraction

2020 ◽  
Vol 2020 (0) ◽  
pp. OS01-05
Author(s):  
Syuya NAMATAME ◽  
Taisuke SATO ◽  
Takatsune NARUMI ◽  
Akiomi USHIDA
Keyword(s):  
Flow Behavior ◽  
Fiber Suspension ◽  
Nano Fiber ◽  
Abrupt Contraction

scholarly journals Fiber orientation in Fiber Suspension Flow through a Parallel Plate Channel and an Abrupt Contraction Channel

1991 ◽  
Vol 37 (3) ◽  
pp. 67-72 ◽  
Author(s):  
Kunji Chiba ◽  
Shigetoshi Hayashi ◽  
Kunio Kojima ◽  
Ki-Won Song ◽  
Kiyoji Nakamura ◽  
...  
Keyword(s):  
Fiber Orientation ◽  
Parallel Plate ◽  
Fiber Suspension ◽  
Suspension Flow ◽  
Fiber Suspension Flow ◽  
Flow Through ◽  
Abrupt Contraction ◽  
Plate Channel

Effects of Contraction Ratio on Elastic Instability of Hyaluronate Solution in a Micro Channel

2015 ◽  
Author(s):  
Taiki Oka ◽  
Ruri Hidema ◽  
Hiroshi Suzuki ◽  
Yoshiyuki Komoda
Keyword(s):  
Water Solution ◽  
Flow Behavior ◽  
Sodium Hyaluronate ◽  
Flow Characteristics ◽  
Micro Channel ◽  
Elastic Instability ◽  
Channel Geometry ◽  
Contraction Ratio ◽  
Abrupt Contraction ◽  
Phosphate Buffered Saline

Flow behaviors of sodium hyaluronate (HA-Na) in water solution and in phosphate buffered saline (PBS) solution as a viscoelastic fluids in planer abrupt contraction-expansion channels has been observed in this study. Especially, the effect of the geometry of the flow path on the flow behavior was focused on. The corner vortices in the corner of the upper region in the abrupt contraction-expansion channels were also analyzed to quantify the flow characteristics. The elasticity numbers of the solution, which is affected by rheological properties of the solution and the channel geometry had a big influence on the fluidity, that is, stable or unstable, when the concentration of the solution in lower. It was concluded that such stable and unstable flows are categorized on Wissenberg-Reynolds number space.

S0501-2-6 Abrupt Contraction Flow of Bacterial Cellulose Fiber Suspension

2009 ◽  
Vol 2009.2 (0) ◽  
pp. 85-86
Author(s):  
Kazunori YASUDA ◽  
Kunji CHIBA ◽  
Yukiharu IWAMOTO ◽  
Motosuke SOGO
Keyword(s):  
Bacterial Cellulose ◽  
Cellulose Fiber ◽  
Fiber Suspension ◽  
Contraction Flow ◽  
Abrupt Contraction

Reactivity of Pulmonary Alveolar Cells to Crocidolite Asbestos Fibers

1982 ◽  
Vol 40 ◽  
pp. 334-335
Author(s):  
Charles L. Sanders ◽  
Roy R. Adee
Keyword(s):  
Osmium Tetroxide ◽  
Intratracheal Instillation ◽  
Uranyl Acetate ◽  
Fiber Suspension ◽  
Nacl Solution ◽  
Alveolar Cells ◽  
Asbestos Fibers ◽  
Fischer Rats ◽  
Mineral Silicates

Asbestos is a generic name for a group of hydrated mineral silicates that occur naturally in a fibrous form. The early interactions of asbestos fibers with alveolar cells in large part determines their long-term toxicity. Young adult, SPF, Fischer rats were given a single intratracheal instillation of 2 mg crocidolite asbestos suspended in 0.5 ml of 0.9% NaCl solution. About 80% of the fibers had lengths of less than 10 ym as measured on light micrographs of the fiber suspension. Two rats were killed at 3 hr, 1 d and 1, 4, 8, 12 and 16 wk after instillation and the lungs instilled with 8 ml McDowell - Trumps at 20 cm H2O. Lung tissue was dehydrated and sputtered coated with palladium-gold for SEM or post-fixed in osmium tetroxide, embedded in epoxy resin and sections stained with uranyl acetate and lead citrate for TEM.

Investigation on the control of multiphase flow behavior in a continuous casting tundish during ladle change

2020 ◽  
Vol 117 (6) ◽  
pp. 619
Author(s):  
Rui Xu ◽  
Haitao Ling ◽  
Haijun Wang ◽  
Lizhong Chang ◽  
Shengtao Qiu
Keyword(s):  
Multiphase Flow ◽  
Flow Behavior ◽  
Rolled Strip ◽  
Impact Zone ◽  
Steel Cleanliness ◽  
Carry Over ◽  
Slag Carry Over ◽  
Hot Rolled ◽  
Turbulence Inhibitor ◽  
The Impact

The transient multiphase flow behavior in a single-strand tundish during ladle change was studied using physical modeling. The water and silicon oil were employed to simulate the liquid steel and slag. The effect of the turbulence inhibitor on the slag entrainment and the steel exposure during ladle change were evaluated and discussed. The effect of the slag carry-over on the water-oil-air flow was also analyzed. For the original tundish, the top oil phase in the impact zone was continuously dragged into the tundish bath and opened during ladle change, forming an emulsification phenomenon. By decreasing the liquid velocities in the upper part of the impact zone, the turbulence inhibitor decreased considerably the amount of entrained slag and the steel exposure during ladle change, thereby eliminating the emulsification phenomenon. Furthermore, the use of the TI-2 effectively lowered the effect of the slag carry-over on the steel cleanliness by controlling the movement of slag droplets. The results from industrial trials indicated that the application of the TI-2 reduced considerably the number of linear inclusions caused by ladle change in hot-rolled strip coils.

Microstructure simulation of early paper forming using immersed boundary methods

TAPPI Journal ◽  
2011 ◽  
Vol 11 (11) ◽  
pp. 23-30 ◽  
Author(s):  
ANDREAS MARK ◽  
ERIK SVENNING ◽  
ROBERT RUNDQVIST ◽  
FREDRIK EDELVIK ◽  
ERIK GLATT ◽  
...  
Keyword(s):  
Early Paper ◽  
Contact Model ◽  
Fiber Suspension ◽  
Beam Equation ◽  
Immersed Boundary ◽  
Paper Machine ◽  
Immersed Boundary Methods ◽  
Element Discretization ◽  
Microstructure Simulation ◽  
Boundary Methods

Paper forming is the first step in the paper machine where a fiber suspension leaves the headbox and flows through a forming fabric. Complex physical phenomena occur as the paper forms, during which fibers, fillers, fines, and chemicals added to the suspension interact. Understanding this process is important for the development of improved paper products because the configuration of the fibers during this step greatly influences the final paper quality. Because the effective paper properties depend on the microstructure of the fiber web, a continuum model is inadequate to explain the process and the properties of each fiber need to be accounted for in simulations. This study describes a new framework for microstructure simulation of early paper forming. The simulation framework includes a Navier-Stokes solver and immersed boundary methods to resolve the flow around the fibers. The fibers were modeled with a finite element discretization of the Euler-Bernoulli beam equation in a co-rotational formulation. The contact model is based on a penalty method and includes friction and elastic and inelastic collisions. We validated the fiber model and the contact model against demanding test cases from the literature, with excellent results. The fluid-structure interaction in the model was examined by simulating an elastic beam oscillating in a cross flow. We also simulated early paper formation to demonstrate the potential of the proposed framework.

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