Stability of liquid flow along the wall of a vertical tube under the action of tangential stress

1973 ◽  
Vol 5 (3) ◽  
pp. 511-513
Author(s):  
L. V. Pashinina
Keyword(s):  
Tangential Stress ◽  
Liquid Flow ◽  
Vertical Tube

scholarly journals Dynamics of long gas bubbles rising in a vertical tube in a cocurrent liquid flow

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
M. Magnini ◽  
S. Khodaparast ◽  
O. K. Matar ◽  
H. A. Stone ◽  
J. R. Thome
Keyword(s):  
Liquid Flow ◽  
Gas Bubbles ◽  
Vertical Tube

Flow Configure in Vertical 180 Degree Turning Duct

2001 ◽  
Author(s):  
Lu Yuanwei ◽  
Zhou Fangde ◽  
Wang Yueshe ◽  
Qian Huanqun ◽  
Hu Zhihua
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Two Phase Flow ◽  
Vertical Tube ◽  
Experimental Result ◽  
Phase Flow ◽  
Two Phase ◽  
Vertical Part ◽  
Flow Situation ◽  
Gas Liquid Flow

Abstract Bend is applied in many industries, which exert an influence on fluid and make the flow complicate. The second flow caused by the bend is strong enough that the flow behind it very long can be affected, so it is hard to make the flow in it steady. The long-term unsteady flow can make the pipe fatigue, so make the tube crack and leak. It is important to improve this situation. In this paper a throttle is built in the exit of the bend to control the non-homogeneous flow inside the bend, which can overcome the disadvantage of bend in industrial application. Through computed the flow field behind the bend by water, we can see that the throttle can improve the flow situation and make the flow steady behind it. Applying this method to the gas-liquid flow, the experimental result showed that the void fraction behind the bend is alike the fully developed flow. It means that the throttle can improve the two-phase flow situation in the invert U bend. At last the gas-liquid flow pattern in-bend was studied by experiment and built the flow pattern map in the vertical parts of the invert U bend. It was found that the flow pattern in the vertical part of invert U bend is different from the fully developed gas-liquid flow in vertical tube. The throttle built in the bend make the unsteady region of two-phase flow being reduced.

scholarly journals PENGARUH HAMBATAN DOWNSTREAM TERHADAP KARAKTERISTIK PEMISAHAN FASE KEROSENE-AIR PADA T-JUNCTION 90O

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Untung Surya Dharma ◽  
Dewi Puspita Sari ◽  
Indarto Indarto ◽  
Purnomo Purnomo
Keyword(s):  
Liquid Flow ◽  
Separation Efficiency ◽  
Horizontal Tube ◽  
Maximum Flow ◽  
Glass Tube ◽  
Vertical Tube ◽  
Horizontal Pipe ◽  
Separation Result ◽  
Separation Behavior ◽  
Behavior Characteristic

Research on T-Junction as a separator of liquid-liquid flow is still of interest and developing. Some works evaluated certain geometries to obtain the best separation efficiency. The work to examine the separation behavior/characteristic of kerosene-water flow in a T-Junction at ratio of elbow radius to inlet diameter horizontal pipe (r/Dh) = 0.69 carried out is completed. The orientation of side arm is vertically right upward whilst the ratio at diameter of the flex glass tube is set at 0.7 (horizontal tube and vertical tube at 36 mm and 26 mms respectively). To lead kerosene to the side arm, the downstream valve set at 75% and 50% respectively. Downstream pressure, pressures difference at inlet-run arm (∆P1-2) and inlet-side arm (∆P1-3) and debit of kerosene and water in side and run arm are the variable at the research. Based on visualization and measurement at maximum flow separation efficiency at 88%, is gained at downstream pressure 104326 Pa, watercut 46%, Jmix = 0,31 m/s (Jw = 0,14 m/s and Jk = 0,17 m/s). The best separation  result with Fk = 0,96 and Fw = 0,22 is gained at  downstream pressure 104287 Pa, watercut 70%, Jmix = 0,56 m/s (Jw = 0,39 m/s and Jk = 0,17 m/s)  and flow pattern at Stratified Bubble Interface (ST-BI)

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

1988 ◽  
Vol 46 ◽  
pp. 770-771
Author(s):  
June D. Kim
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Ternary Phase Diagram ◽  
Vertical Tube ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Soft Magnetic ◽  
Quenching Temperature ◽  
Thin Foils ◽  
Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

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