Experimental Research on Inner Channel Effect of Rock Water-Gel Explosive

2012 ◽  
Vol 170-173 ◽  
pp. 3023-3026
Author(s):  
Hong Bing Xia ◽  
Yi Jun Zhang
Keyword(s):  
Experimental Research ◽  
Pipe Diameter ◽  
Internal Diameter ◽  
Channel Effect ◽  
Inner Channel ◽  
Pipe Materials

An inner-pipe charging construction can be constituted by putting different materials with different internal diameter on the axis of the rock-gel explosive. Then the explosion velocity can be measured and the effect of inner-pipe to explosion velocity can be analyzed. The results show that explosion velocity of water-gel explosive changes in a mode of rising first and falling later with the increase of inner-pipe diameter and the charging ratio varies with different inner-pipe materials.

scholarly journals Experimental research on hydrodynamic instabilities during condensation of the pro-ecological refrigerant R1234yf in tubular minichannels

2018 ◽  
Vol 70 ◽  
pp. 02010
Author(s):  
Waldemar Kuczyński ◽  
Aleksander Denis
Keyword(s):  
Experimental Data ◽  
Phase Change ◽  
Experimental Research ◽  
Change Process ◽  
Internal Diameter ◽  
Hydrodynamic Instabilities ◽  
Condensation Zone ◽  
Phase Change Process ◽  
Flow Condensation ◽  
Propagation Velocities

The following paper presents the results of preliminary experimental research on the influence of instabilities of a hydrodynamic type on the condensation phase change process in tubular minichannels. The research was focused on a new pro-ecological refrigerant, R1234yf, intended as a substitute for R134a that currently is being phased out. The flow condensation phase change process was investigated for both steady and un-steady conditions in singular tubular minichannels with an internal diameter d = {1,44; 2,30; 3,30} mm. The scope of the analysis of the experimental data covered an estimation of propagation velocities for both pressure and temperature instabilities as well as the shrinkage of the condensation zone. The results were also compared with the previous results obtained for the flow condensation phase change of R134a refrigerant in tubular minichannels with the same internal diameters.

scholarly journals Investigation of flow structures during HFE-7100 refrigerant condensation

2015 ◽  
Vol 36 (4) ◽  
pp. 25-34 ◽  
Author(s):  
Tadeusz Bohdal ◽  
Małgorzata Sikora ◽  
Katarzyna Widomska ◽  
Andrii M. Radchenko
Keyword(s):  
Flow Structure ◽  
Experimental Research ◽  
Environmentally Friendly ◽  
Low Pressure ◽  
Flow Patterns ◽  
Flow Structures ◽  
Condensation Process ◽  
Internal Diameter

Abstract The experimental research of environmentally friendly refrigerant HFE-7100 condensation in pipe minichannels was conducted. During the investigations of HFE-7100 condensation in a minichannel with internal diameter 2 mm together with visualization of flow patterns was made. Visualization results were compared with existing flow structure maps. The identification of the range of flow patterns occurrence during the condensation process of low-pressure refrigerant HFE-7100 was made. The tests were performed throughout the whole range of condensation process.

Analysis of the Surface Roughness of a Tube Drawn by a Fixed Mandrel

2020 ◽  
Vol 994 ◽  
pp. 70-77 ◽  
Author(s):  
Augustín Görög ◽  
Ingrid Görögová ◽  
Maroš Martinkovič
Keyword(s):  
Surface Roughness ◽  
Experimental Research ◽  
Surface Finish ◽  
Small Diameter ◽  
Internal Diameter ◽  
Tube Drawing ◽  
Inner Surface ◽  
Spiral Grooves ◽  
Drawing Method

The manufacture of tubes by a fixed mandrel drawing is one of the technologies in the manufacture of seamless tubes. This is the oldest tube drawing method. It uses a mandrel at the end of the die to shape the internal diameter of the tube. This process is slow and the area reductions are limited (lengths of tubes are limited), but it gives the best inner surface finish of any of the processes. The use of a fixed mandrel by the drawing of small-diameter tubes makes it possible to increase the accuracy of the inner surface and improve the quality. The paper presents the results of solving a partial task in this area. It deals with the reconstruction of the microgeometry of the inner surface of a tube drawn by a fixed mandrel. Tubes (STN 41 1353) were drawn through dies with different reduction angles. There were grounds the straight and spiral grooves on used fixed mandrels. On the inner surface of the tube were formed grooves after drawn that had a different surface roughness compared to the mandrel surface. The paper graphically presents the morphology of obtained surfaces under various conditions (reduction angles, straight/spiral grooves on the fixed mandrel) as well as measured surface roughness values. At the end of the paper, the knowledge gained through experimental research are summarized.

scholarly journals Results of Experimental Research of Granular Materials Transportation by Tubular Scraper Conveyors

2013 ◽  
Vol 16 (4) ◽  
pp. 103-107
Author(s):  
Oleg Lyashuk ◽  
Andriy Dyachun ◽  
Roman Zolotuy ◽  
Olexandr Oleksyshyn ◽  
Yroslav Zamora ◽  
...  
Keyword(s):  
Granular Materials ◽  
Experimental Research ◽  
Fill Factor ◽  
Linear Velocity ◽  
Regression Equation ◽  
Regression Coefficients ◽  
Pipe Diameter ◽  
Bulk Materials ◽  
Graphical Dependence ◽  
Curved Track

Abstract A full factor experiment (FFE33) of transporting bulk materials by a tubular scraper conveyor on a curved track was conducted. There were derived the regression equation dependencies of production and torque on pipe diameter, fill factor and linear velocity. The graphical dependence of production and torque on the above-mentioned factors was constructed, and regression coefficients for different materials were determined.

scholarly journals In-Pipe Inspection Micro Robot Adaptable to Changes in Pipe Diameter

2003 ◽  
Vol 15 (6) ◽  
pp. 609-615 ◽  
Author(s):  
Shuichi Wakimoto ◽  
◽  
Koichi Suzumori ◽  
Masanori Takata ◽  
Jun Nakajima
Keyword(s):  
Narrow Channel ◽  
Pipe Diameter ◽  
Internal Diameter ◽  
Driving Mechanism ◽  
Pipe Inspection ◽  
Snake Robot ◽  
Micro Robot ◽  
Basic Motion

In the development of a microrobot for inspecting the inside of pipes with an internal diameter of 1 to 3 inches, the author of this paper designed an in-pipe mobile mechanism adaptive to pipe diameter based on a snake robot and evaluated it theoretically and experimentally. The authors fabricated 2 robots of different size. The first, Prototype A, was used to verify functions and confirm the driving mechanism. It demonstrated basic motion and moved in all directions during an experiment in which the robot passed through a T-shaped pipe. The second, Prototype B, was downsized and could run in narrow channel whose width changes from 0.7 to 3.9 inches.

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

Review of Foundations of Experimental Research. 3rd ed.

1983 ◽  
Vol 28 (10) ◽  
pp. 805-805
Author(s):  
Roger E. Kirk
Keyword(s):  
Experimental Research
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