scholarly journals Response of granular-material flow to abrupt change of surface-shear force

1996 ◽  
Vol 40 ◽  
pp. 1045-1050
Author(s):  
Hitoshi GOTOH ◽  
Tetsuo SAKAI ◽  
Yasuharu TOYOTA ◽  
Atsushi SAKAI
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Shear Force ◽  
Abrupt Change ◽  
Surface Shear

Elimination of Vibrations in an Ore Unloading Bin

1974 ◽  
Vol 96 (3) ◽  
pp. 761-764 ◽  
Author(s):  
M. L. Wei ◽  
J. R. Johanson
Keyword(s):  
Granular Material ◽  
Flow Control ◽  
Material Flow ◽  
Natural Frequencies ◽  
Flow Patterns ◽  
Corrective Measures

Problems of undesirable vibrations in an ore unloading structure are described. Earlier unsuccessful attempts to eliminate vibrations by changing allegedly exciting frequencies mechanically and by increasing natural frequencies structurally are cited. Scientific evaluations of granular material flow patterns in the bin are presented, which identify possible causes of and methods to alleviate the vibrations. Finally, the corrective measures in flow control taken to eliminate vibrations are illustrated.

scholarly journals Material Flow Behavior on Weld Pool Surface in Plasma Arc Welding Process Considering Dominant Driving Forces

2020 ◽  
Vol 10 (10) ◽  
pp. 3569 ◽  
Author(s):  
Manh Ngo Huu ◽  
Anh Nguyen Van ◽  
Tuan Nguyen Van ◽  
Dang Tran Hai ◽  
Thanh Nguyen Van ◽  
...  
Keyword(s):  
Weld Pool ◽  
Material Flow ◽  
Arc Welding ◽  
Shear Force ◽  
Driving Forces ◽  
Flow Behavior ◽  
Shielding Gas ◽  
Pool Surface ◽  
Marangoni Force ◽  
Weld Pool Surface

In this study, the effect of oxygen in the shielding gas on the material flow behavior of the weld pool surface was discussed to clarify the dominant driving weld pool force in keyhole plasma arc welding (KPAW). To address this issue, the convection flow on the top surface of weld pool was observed using a high-speed video camera. The temperature distribution on the surface along keyhole wall was measured using the two-color pyrometry method to confirm the Marangoni force activity on the weld pool. The results show that the inclination angle of the keyhole wall (keyhole shape) increased especially near the top surface due to the decrease in the surface tension of weld pool through surface oxidation when a shielding gas of Ar + 0.5% O2 was used. Due to the change in the keyhole shape, the upward and backward shear force compositions created a large inclination angle at the top surface of the keyhole. From the temperature measurement results, the Marangoni force was found to alter the direction when 0.5% O2 was mixed with the shielding gas. The shear force was found to be the strongest force among the four driving forces. The buoyant force and Lorentz force were very weak. The Marangoni force was stronger than the Lorentz force but was weaker than shear force. The interaction of shear force and Marangoni force controlled the behavior and speed of material flow on the weld pool surface. A strong upward and backward flow was observed in the case of mixture shielding gas, whereas a weak upward flow was observed for pure Ar. The heat transportation due to the weld pool convection significantly changed when only a small amount of oxygen was admixed in the shielding gas. The results can be applied to control the penetration ratio in KPAW.

scholarly journals Electrohydrodynamic removal of non-specific colloidal adsorption at electrode interfaces

2014 ◽  
Vol 50 (37) ◽  
pp. 4813-4815 ◽  
Author(s):  
Sakandar Rauf ◽  
Muhammad J. A. Shiddiky ◽  
Matt Trau
Keyword(s):  
Shear Force ◽  
Surface Interactions ◽  
Surface Shear ◽  
Selection Of

This communication reports the use of an electrohydrodynamic surface shear force to selectively manipulate colloid–surface interactions. We demonstrate the selection of strongly (specifically) bound biomolecular-functionalized colloidal beads over more weakly (non-specifically) bound beads.

scholarly journals Deformation of granular material flow in converging channels

2018 ◽  
Vol 206 ◽  
pp. 012004
Author(s):  
A P Bobryakov ◽  
S V Klishin ◽  
V P Kosykh ◽  
S V Lavrikov ◽  
O A Mikenina ◽  
...  
Keyword(s):  
Granular Material ◽  
Material Flow

Research on continuous granular material flow detection method and sensor

Measurement ◽  
2021 ◽  
pp. 109773
Author(s):  
Meng Jiang ◽  
Cailing Liu ◽  
Xin Du ◽  
Rongbiao Huang ◽  
Lei Dai ◽  
...  
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Detection Method ◽  
Flow Detection

Analysis and DEM simulation of granular material flow patterns in hopper models of different shapes

2011 ◽  
Vol 22 (2) ◽  
pp. 226-235 ◽  
Author(s):  
R. Balevičius ◽  
R. Kačianauskas ◽  
Z. Mróz ◽  
I. Sielamowicz
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Flow Patterns ◽  
Dem Simulation ◽  
Different Shapes

scholarly journals Granular Material Flow in Two-Dimensional Hoppers

1978 ◽  
Vol 45 (1) ◽  
pp. 43-50 ◽  
Author(s):  
C. Brennen ◽  
J. C. Pearce
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Two Dimensional

scholarly journals Investigation of the Restored Joint for Aluminum Alloy

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 97 ◽  
Author(s):  
Chao Chen ◽  
Huiyang Zhang ◽  
Hao Peng ◽  
Xiangkun Ran ◽  
Qing Pan
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Material Flow ◽  
Shear Force ◽  
Flow Mode ◽  
Thin Walled Structures ◽  
Mechanical Clinching ◽  
Restoring Forces ◽  
Joint Material

In recent years, the mechanical clinching method plays an increasingly important role in the building of thin-walled structures. The clinched joint can be employed to join the lightweight materials. Compared with other joining methods, the clinched joint has better mechanical behavior. However, the clinched joint may be deformed during use when it bears a high shear force. In this research, a process to join aluminum alloy and restore deformed joint was proposed and investigated. The clinched joint was deformed in the deforming process. Then, a customized rivet and two flat restoring tools were utilized for restoring the deformed joint to join aluminum alloy. Different restoring forces such as 45, 40, 35, 30, 25, and 20 kN were employed to produce diverse restored joints. Some shearing tests on the restored joint were utilized for understanding joint material flow, mode of failure, thickness of neck, shear strength, and absorption of energy. The thickness of neck can be increased in restoring process, which contributes to improve the shear strength. The rivet embedded in a pit also helps restored joint bear shear force, so all of the restored joints have higher absorption of energy and shear strength than the clinched joints. The restoring process effectively restores the deformed joint to obtain better mechanical behavior.

Sign in / Sign up

Export Citation Format

Share Document