Principle Analyzing and Structure Designing for Driving and Timing of Fluid Medium Pressure Difference Pipeline Robot

2011 ◽  
Vol 211-212 ◽  
pp. 530-534
Author(s):  
Yu Feng Zhang ◽  
Sheng Yuan Jiang ◽  
Xue Wen Zhang
Keyword(s):  
Pressure Difference ◽  
Driving Force ◽  
Pipe Wall ◽  
Flowing Fluid ◽  
Fluid Medium ◽  
Friction Resistance ◽  
Medium Pressure ◽  
The Press ◽  
Push Forward ◽  
Pipeline Robot

A pipeline robot is brought forward using the energy of fluid medium transmitting within the pipeline to perform the driving and timing. The robot is soaking in the pipeline full of flowing fluid medium and getting the driving force from the press and velocity energy of medium itself to push forward it. It is discovered during the research that robot need to overcome the gravity and influence of the friction resistance with the pipe wall while driving alone, so for the different mediums and applying situation the robot required to velocity adjustment automatically. According to the condition of the hydrodynamics within the pipe and designing in reason for the size and configuration of the robot, a velocity controlling device is worked out and realized its velocity adjustable.

Design and Manufacturing of Cylinder-Beam Integrated Hydraulic Press

2013 ◽  
Vol 397-400 ◽  
pp. 157-161
Author(s):  
Wei Wei Zhang ◽  
Xiao Song Wang ◽  
Shi Jian Yuan ◽  
Zhong Ren Wang
Keyword(s):  
Driving Force ◽  
Geometric Dimension ◽  
Hydraulic Cylinder ◽  
Hydraulic Press ◽  
Force Distribution ◽  
Section Modulus ◽  
The Press ◽  
The World ◽  
Design And Manufacturing ◽  
Institute Of Technology

For a cylinder-beam integrated hydraulic press (CBIHP), the hydraulic cylinder is also functioned as an upper beam. It is the key structural component that outputs the driving force to forge parts. Compared with the traditional three-beam and four-column hydraulic press which has a cylindrical hydraulic cylinder, the structure and force distribution are significantly different for CBIHP. It is able to have higher nominal force and larger section of plunger which the pressure is applied on when the contour geometric dimension is the same. Also, CBIHP has lighter weight and larger section modulus when the nominal force is the same than the traditional hydraulic press. Finally, a 6300KN cylinder-beam integrated hydraulic press, which is the first CBIHP in the world and designed by Harbin Institute of Technology (HIT) in 2012, is also introduced in this paper. It can be seen from the results of numerical simulation for the CBIHP that both of the stresses and displacements on the press in the loading process are allowable.

Immiscible Two-Phase Parallel Microflow and Its Applications in Fabricating Micro- and Nanomaterials

2021 ◽  
pp. 200-224
Author(s):  
Yujie Li ◽  
Jie Wang ◽  
Shijie Wang ◽  
Di Li ◽  
Shan Song ◽  
...  
Keyword(s):  
Driving Force ◽  
Water Systems ◽  
Liquid Interface ◽  
Parallel Flow ◽  
Two Phase ◽  
Friction Resistance ◽  
Interface Reactions ◽  
Oil Water ◽  
Proper Balance

The immiscible two-phase flow behaves nonlinearly, and it is a challenging task to control and stabilize the liquid-liquid interface. Parallel flow forms under a proper balance between the driving force, the friction resistance, and the interfacial tension. The liquid-solid interaction as well as the liquid-liquid interaction plays an important role in manipulating the liquid-liquid interface. With vacuum-driven flow, long and stable parallel flow is possible to be obtained in oil-water systems and can be used for fabricating micro- and nanomaterials. Ultra-small Cu nanoparticles of 4~10 nm were synthesized continuously through chemical reactions taking place on the interface. This makes it possible for in situ synthesis of conductive nanoink avoiding oxidation. Well-controlled interface reactions can also be used to produce ultra-long sub-micro Cu wires up to 10 mm at room temperature. This method provided new and simple additive fabrication methods for making integrated microfluidic devices.

Temperature fields in a pipe wall in the case of radiative heating and a supercritical working-medium pressure

1974 ◽  
Vol 27 (2) ◽  
pp. 993-997
Author(s):  
V. B. Khabenskii ◽  
M. A. Kvetnyi ◽  
�. M. Tyntarev ◽  
R. I. Kalinin
Keyword(s):  
Pipe Wall ◽  
Radiative Heating ◽  
Temperature Fields ◽  
Medium Pressure ◽  
Working Medium

THE IMPERIAL SIGNIFICANCE OF THE CANADIAN–AMERICAN RECIPROCITY PROPOSALS OF 1911

2004 ◽  
Vol 47 (1) ◽  
pp. 81-100 ◽  
Author(s):  
SIMON J. POTTER
Keyword(s):  
United States ◽  
Driving Force ◽  
Political Conflict ◽  
Contemporary Debate ◽  
Political Ideas ◽  
Tariff Reform ◽  
Limited Success ◽  
The Press ◽  
Canadian Manufacturing ◽  
Political Groups

This article builds on the recent willingness among British, Canadian, and imperial historians to question older national histories, and to re-examine how the divergent societies, economies, and polities of the empire once interacted in a wider ‘British world’. It argues that the press acted as a key mechanism for the transmission of political ideas through the permeable internal boundaries of empire. This is demonstrated through analysis of contemporary debate over the Canadian–American reciprocity proposals of 1911. This controversy provided an opportunity for political groups in Britain and Canada to use the press to forge alliances with each other and work together on a specific issue. Two key forces made this possible. In Britain, constructive imperialists had since 1903 sought to rally Dominion support for tariff reform, initially with limited success. In Canada, neither western farmers nor eastern manufacturers seemed interested in imperial preference. It was the reciprocity proposals that changed the situation, providing the second driving force. Canadian manufacturing interests, seeking to prevent the lowering of tariff barriers against United States rivals, began to court British constructive imperialists. As a result political conflict was reshaped both in colony and metropole.

scholarly journals Impact of Main Pipe Flow Velocity on Leakage and Intrusion Flow: An Experimental Study

Water ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 118 ◽  
Author(s):  
Yu Shao ◽  
Tian Yao ◽  
Jinzhe Gong ◽  
Jinjie Liu ◽  
Tuqiao Zhang ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Pipe Flow ◽  
Pressure Difference ◽  
Discharge Coefficient ◽  
Pipe Wall ◽  
Technical Note ◽  
Opposite Pattern ◽  
Main Pipe ◽  
Pressurized Pipelines ◽  
The Impact

The classic orifice equation is commonly used to calculate the leakage and intrusion rate for pressurized pipelines with cracks on the pipe wall. The conventional orifice equation does not consider the effect of the flow velocity in the main pipe, and there is a lack of studies on this matter. For this technical note, the influence of the main pipe flow velocity on the outflow and inflow through a crack on the pipe wall was studied in the laboratory. The experimental results show that the impact of the main pipe flow velocity can be significant. When the pressure difference across the orifice was constant, with the increase of the main pipe flow velocity, the outflow velocity increased, but the contraction area of the jet and the outflow discharge coefficient decreased. By comparing orifices with different shapes, it was found that the discharge from the circumferential crack was most sensitive to the main pipe flow velocity. In addition, the main pipe flow promoted the orifice inflow. When the pressure difference across the orifice was constant, with the increase of the main pipe flow velocity, the inflow discharge coefficient increased, which is the opposite pattern to that of the orifice outflow.

Unsteady viscous flow in a pipe of slowly varying cross-section

1974 ◽  
Vol 64 (2) ◽  
pp. 209-226 ◽  
Author(s):  
P. Hall
Keyword(s):  
Viscous Flow ◽  
Cross Section ◽  
Pressure Difference ◽  
Pipe Wall ◽  
Oscillatory Motion ◽  
Steady Streaming ◽  
First Order ◽  
Order Of Magnitude ◽  
Unsteady Viscous Flow ◽  
Oscillatory Pressure

The steady streaming generated in a pipe of slowly varying cross-section when a purely oscillatory pressure difference is maintained between its ends is considered. It is assumed that the perturbation of the pipe wall in the r, θ plane is small compared with the characteristic thickness of the Stokes layer associated with the oscillatory motion of the fluid. The first-order steady streaming is evaluated for the cases when this characteristic thickness is large and small compared with a typical radius of the pipe. In both these limits it is found that the geometry of the pipe is crucial in determining the nature of the induced steady streaming. If the ends of the pipe have the same mean radius it is found that the steady streaming consists of regions of recirculation between the nodes of the pipe. Otherwise the steady streaming is of a larger order of magnitude and has a component which represents a net flow towards the wider end of the pipe.

Immiscible Two-Phase Parallel Microflow and Its Applications in Fabricating Micro- and Nanomaterials

2019 ◽  
pp. 136-166
Author(s):  
Yujie Li ◽  
Jie Wang ◽  
Shijie Wang ◽  
Di Li ◽  
Shan Song ◽  
...  
Keyword(s):  
Driving Force ◽  
Water Systems ◽  
Liquid Interface ◽  
Parallel Flow ◽  
Two Phase ◽  
Friction Resistance ◽  
Interface Reactions ◽  
Oil Water ◽  
Proper Balance

The immiscible two-phase flow behaves nonlinearly, and it is a challenging task to control and stabilize the liquid-liquid interface. Parallel flow forms under a proper balance between the driving force, the friction resistance, and the interfacial tension. The liquid-solid interaction as well as the liquid-liquid interaction plays an important role in manipulating the liquid-liquid interface. With vacuum-driven flow, long and stable parallel flow is possible to be obtained in oil-water systems and can be used for fabricating micro- and nanomaterials. Ultra-small Cu nanoparticles of 4~10 nm were synthesized continuously through chemical reactions taking place on the interface. This makes it possible for in situ synthesis of conductive nanoink avoiding oxidation. Well-controlled interface reactions can also be used to produce ultra-long sub-micro Cu wires up to 10 mm at room temperature. This method provided new and simple additive fabrication methods for making integrated microfluidic devices.

Scaling effects in spiral capsule robots

2017 ◽  
Vol 231 (4) ◽  
pp. 307-314 ◽  
Author(s):  
Liang Liang ◽  
Rong Hu ◽  
Bai Chen ◽  
Yong Tang ◽  
Yan Xu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Vessels ◽  
Driving Force ◽  
Pipe Wall ◽  
Fluid Pressure ◽  
Turbulent Intensity ◽  
Load Torque ◽  
Capsule Robot ◽  
Dynamics Method

Spiral capsule robots can be applied to human gastrointestinal tracts and blood vessels. Because of significant variations in the sizes of the inner diameters of the intestines as well as blood vessels, this research has been unable to meet the requirements for medical applications. By applying the fluid dynamic equations, using the computational fluid dynamics method, to a robot axial length ranging from 10−5 to 10−2 m, the operational performance indicators (axial driving force, load torque, and maximum fluid pressure on the pipe wall) of the spiral capsule robot and the fluid turbulent intensity around the robot spiral surfaces was numerically calculated in a straight rigid pipe filled with fluid. The reasonableness and validity of the calculation method adopted in this study were verified by the consistency of the calculated values by the computational fluid dynamics method and the experimental values from a relevant literature. The results show that the greater the fluid turbulent intensity, the greater the impact of the fluid turbulence on the driving performance of the spiral capsule robot and the higher the energy consumption of the robot. For the same level of size of the robot, the axial driving force, the load torque, and the maximum fluid pressure on the pipe wall of the outer spiral robot were larger than those of the inner spiral robot. For different requirements of the operating environment, we can choose a certain kind of spiral capsule robot. This study provides a theoretical foundation for spiral capsule robots.

scholarly journals The Croonian Lecture - Transport of substances in plants

1938 ◽  
Vol 125 (838) ◽  
pp. 1-25 ◽  
Keyword(s):  
Vapour Pressure ◽  
Pressure Difference ◽  
Royal Society ◽  
Driving Force ◽  
Energy Conditions ◽  
First Approximation ◽  
Vapour Pressure Difference

When the Royal Society—now many years ago—did the late Dr Joly and me the honour of publishing our first paper on the ascent of sap (Dixon and Joly 1894, 1895), it was not difficult to make a first approximation as to the mechanism, and the energy conditions, availed of by plants in lifting water from the soil to their leaves. The driving force was to be sought in the vapour-pressure difference obtaining in the spaces surrounding the roots and the leaves (Dixon 1897).

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