Transition of Pumping-up Behavior for High Viscosity Solution Using Rotating Cone and Visualization of Internal Circulation Flow

2017 ◽  
Vol 2017.53 (0) ◽  
pp. 311
Author(s):  
Yutaro Takahashi ◽  
Takahiro Adachi
Keyword(s):  
Viscosity Solution ◽  
High Viscosity ◽  
Circulation Flow ◽  
Internal Circulation ◽  
Rotating Cone

Evidence of re-entrant behavior in laponite-PEO systems

2005 ◽  
Vol 899 ◽  
Author(s):  
Hossein Baghdadi ◽  
Surita R. Bhatia ◽  
Elizabeth E. C. Jensen ◽  
Nalini Easwar
Keyword(s):  
Molecular Weight ◽  
Viscosity Solution ◽  
High Viscosity ◽  
Polymer Chains ◽  
Low Viscosity ◽  
End Distance ◽  
Depletion Force ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Electrostatic Repulsions

AbstractRheology and dynamic light scattering capture re-entrant behavior of laponite-polymer systems. Neat laponite under basics conditions and concentrations of 2wt% or greater forms a viscoelastic soft glass due to electrostatic repulsions. We show that that addition of low molecular weight poly(ethylene oxide) (PEO) melts the glass due to a depletion force. The depletion force speeds up dynamics in the system resulting in a low viscosity solution. A re-entrant viscoelastic solid is formed with the addition of high molecular weight PEO due to the polymer chains bridging between laponite particles. As expected the transition from a low to high viscosity solution scales with the polymer mean square end-to-end distance and gap between laponite particles.

Analysis and Calculation of Vacuum Film Deaeration for High Viscosity Liquids

2011 ◽  
Vol 141 ◽  
pp. 76-82 ◽  
Author(s):  
Xiao Bo Liu ◽  
Jian Run Zhang ◽  
Pu Li ◽  
Xin Hua Wang
Keyword(s):  
High Viscosity ◽  
Main Flow ◽  
Growth Time ◽  
Relative Slip ◽  
Removal Time ◽  
Rotating Surface ◽  
Rest Time ◽  
Cone Surface ◽  
Rotating Cone ◽  
Film Flows

A theoretical analysis of Vacuum Film Deaeration(VFD) based on the characteristics of fluid film on a rotating cone surface is carried out. The motion equation of bubble is derived to find out its relative slip velocity in the flowing film. And the bubbles removal time from the high viscosity liquid is discussed. The thickness model of liquid film on the rotating surface and the residence time of the film flows over the surface are built in this paper. It is found that the thickness and the velocity of the flowing film on the rotating cone surface are the key parameters for VFD; the time of bubble remove mainly includes the growth time and the rest time; the velocity of bubble is slightly lagging behind the main flow; the low angular velocity has little effect on the film thickness; and the time of VFD for flowing film is less than that of static film.

scholarly journals CFD Study of Gas Holdup and Frictional Pressure Drop of Vertical Riser Inside IC Reactor

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 936 ◽  
Author(s):  
Sheng Wang ◽  
He Dong ◽  
Zhongfeng Geng ◽  
Xiuqin Dong
Keyword(s):  
Pressure Drop ◽  
Flow Rate ◽  
Phase Interface ◽  
Gas Holdup ◽  
Circulation System ◽  
Circulation Flow ◽  
Internal Circulation ◽  
Frictional Pressure Drop ◽  
Volumetric Loading ◽  
Circulation Flow Rate

The internal circulation system in Internal Circulation (IC) reactor plays an important role in increasing volumetric loading rate and promoting the mixing between sludge and wastewater. In order to design the internal circulation system, the flow behaviors of gas-liquid inside vertical riser should be studied in detail. In the present study, the Multiple Flow Regimes model is adopted to capture the phase interface for different flow conditions. The flow patterns, internal circulation flow rate, gas holdup, and frictional pressure drop of vertical riser are investigated. The results show that the bubble flow inside a vertical riser is in a stable flow condition. There exists a maximum value for internal circulation flow rate with the increasing superficial gas velocity. The parameters of Martinelli models for gas holdup and frictional pressure drop are improved based on Computational Fluid Dynamics (CFD) results. The deviations between the calculated gas holdup and frictional pressure drop by improved model and experimental value are reduced to 14% and 13.2%, respectively. The improved gas holdup and frictional pressure drop model can be used for the optimal design of internal circulation system.

The microscale Weissenberg effect for high-viscosity solution pumping at the picoliter level

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 7127-7137 ◽  
Author(s):  
Xuecui Mei ◽  
Qinnan Chen ◽  
Shihu Wang ◽  
Wei Wang ◽  
Dezhi Wu ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Viscosity Solution ◽  
High Viscosity ◽  
Nano Fabrication ◽  
Weissenberg Effect ◽  
Viscous Solutions

Microscale Weissenberg effect based pumping of highly viscous solutions at the picoliter level with a rapid dynamic response is paramount for micro/nano-fabrication.

Electrospun Fibrous Films with Sub-Micrometer Structure in Biomedical Applications

2011 ◽  
Vol 332-334 ◽  
pp. 977-980
Author(s):  
Chao Feng ◽  
Lu Feng Mo ◽  
Fu Juan Liu
Keyword(s):  
Viscosity Solution ◽  
Biomedical Applications ◽  
High Viscosity ◽  
Manufactured Nanomaterials ◽  
Adverse Impacts ◽  
Viscosity Polymer

Although manufactured nanomaterials have a great many of fantastic functions，the adverse impacts about them have been observed. As a kind of nanomaterial, biomedical films obtained from electrospinning are valued greatly, and the sizes of the diameters in electrospun films plays a fundamental role in enhancing the safety of films. When the diameter of fibers increased to hundreds of nanometers, it will become difficult for fibers to diffuse and infiltrate into human’s body, and then the security of the biomedical films is enhanced greatly. In our work, high viscosity polymer and high viscosity solution are electrospun to increase the diameter of fibers. Besides, melt-eletrospinning is introduced as an alternative candidate for improving the security of biomedical films, especially no poisonous solvent exists.

Ultra low aluminium DWI grade development of an atypical continuous casting powder with high viscosity

2009 ◽  
Vol 106 (6) ◽  
pp. 242-247
Author(s):  
C. Damerval ◽  
H. Tavernier ◽  
L. Avedian ◽  
P. Disant ◽  
P. Delfosse ◽  
...  
Keyword(s):  
Continuous Casting ◽  
High Viscosity
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