scholarly journals Estimating the Influence of Surface Characteristics of Rock Joint on Shear Behavior and Coupled Shear-Flow Characteristics

2007 ◽  
Vol 56 (9) ◽  
pp. 796-802
Author(s):  
Yuijing JIANG ◽  
Ryosuke SAHO ◽  
Yusuke TASAKU ◽  
Bo LI ◽  
Yoshihiko TANABASHI
Keyword(s):  
Shear Flow ◽  
Rock Joint ◽  
Flow Characteristics ◽  
Surface Characteristics ◽  
Shear Behavior

scholarly journals Effect of rock joint roughness on its cyclic shear behavior

2017 ◽  
Vol 9 (6) ◽  
pp. 1071-1084 ◽  
Author(s):  
S.M. Mahdi Niktabar ◽  
K. Seshagiri Rao ◽  
Amit Kumar Shrivastava
Keyword(s):  
Rock Joint ◽  
Shear Behavior ◽  
Joint Roughness ◽  
Cyclic Shear

Effect of grouting on shear behavior of rock joint

2017 ◽  
Vol 98 ◽  
pp. 159-166 ◽  
Author(s):  
M.H. Salimian ◽  
A. Baghbanan ◽  
H. Hashemolhosseini ◽  
M. Dehghanipoodeh ◽  
S. Norouzi
Keyword(s):  
Rock Joint ◽  
Shear Behavior

Effect of contact state on the shear behavior of artificial rock joint

2015 ◽  
Vol 75 (2) ◽  
pp. 761-769 ◽  
Author(s):  
Zhi Cheng Tang ◽  
Run Qiu Huang ◽  
Quan Sheng Liu ◽  
Louis Ngai Yuen Wong
Keyword(s):  
Rock Joint ◽  
Shear Behavior ◽  
Contact State ◽  
Artificial Rock

scholarly journals Dynamic Flow Characteristics and Design Principles of Laminar Flow Microbial Fuel Cells

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 479 ◽  
Author(s):  
Way Cheng ◽  
Celal Erbay ◽  
Reza Sadr ◽  
Arum Han
Keyword(s):  
Fuel Cells ◽  
Laminar Flow ◽  
Microbial Fuel Cells ◽  
Rectangular Cross Section ◽  
Fluid Velocity ◽  
Flow Characteristics ◽  
Surface Characteristics ◽  
Substantial Effect ◽  
Design Guidelines ◽  
Bacterial Attachment

Laminar flow microbial fuel cells (MFCs) are used to understand the role of microorganisms, and their interactions with electrodes in microbial bioelectrochemical systems. In this study, we reported the flow characteristics of laminar flow in a typical MFC configuration in a non-dimensional form, which can serve as a guideline in the design of such microfluidic systems. Computational fluid dynamics simulations were performed to examine the effects of channel geometries, surface characteristics, and fluid velocity on the mixing dynamics in microchannels with a rectangular cross-section. The results showed that decreasing the fluid velocity enhances mixing but changing the angle between the inlet channels, only had strong effects when the angle was larger than 135°. Furthermore, different mixing behaviors were observed depending on the angle of the channels, when the microchannel aspect ratio was reduced. Asymmetric growth of microbial biofilm on the anode side skewed the mixing zone and wall roughness due to the bacterial attachment, which accelerated the mixing process and reduced the efficiency of the laminar flow MFC. Finally, the magnitude of mass diffusivity had a substantial effect on mixing behavior. The results shown here provided both design guidelines, as well as better understandings of the MFCs due to microbial growth.

Characteristics of Planar Counter Current Shear Flow in Dump Geometry

2011 ◽  
Author(s):  
Prasad Kalghatgi ◽  
Sumanta Acharya ◽  
Paul Strykowski ◽  
Matt Anderson
Keyword(s):  
Shear Flow ◽  
Mass Flow ◽  
Velocity Ratio ◽  
Spectral Characteristics ◽  
Flow Characteristics ◽  
Control Flow ◽  
Mean Flow ◽  
Global Mode ◽  
Instability Modes ◽  
Countercurrent Shear

Countercurrent shear can be used in engineering applications to control flow structure and mixing. In the present paper a planar countercurrent shear flow is studied numerically using Large Eddy Simulation. Mean flow characteristics at a primary-jet Reynolds number of 14700 are studied for three values of a key parameter, the secondary to primary jet mass flow ratio (m˙s/m˙p), chosen to match reported measurements. The predicted flow results of time averaged flow field, Strouhal number and turbulence characteristics are compared with the experimentally available data. A change in instability modes is observed at mass flow ratios above m˙s/m˙p = 0.27 with more than 100% increase in the turbulence levels and distinct changes in spectral characteristics. Detailed spectral records along with landau modeling are used as evidence of existence of self excited global mode beyond a critical velocity ratio in the flow.

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