Performance of Solid-Liquid Two Phase Jet Pump Vacuuming Up Beach Sand

2010 ◽  
Author(s):  
K. Itoh ◽  
S. Nishigaki ◽  
I. Honda ◽  
T. Yoshida ◽  
A. Boda ◽  
...  
Keyword(s):  
Cross Section ◽  
Nozzle Exit ◽  
Single Phase ◽  
Flow Rate Ratio ◽  
Pump Efficiency ◽  
Phase Flow ◽  
Cross Section Ratio ◽  
Jet Pump ◽  
Two Phase ◽  
Section Ratio

The performance of the water-sand two phase jet pump has been evaluated for developing environmental sand purification systems. Three types of throat diameter, D = 26, 31, 37 mm, are tested with constant nozzle-exit diameter 20 mm in order to vary the cross section ratio of nozzle exit to throat, R = 0.59, 0.42 and 0.29. The coarse and fine natural sands extracted at Hirase-higashi beach and artificial crushed sand, of which the fineness modulus are 2.71, 2.03 and 2.88 respectively, are mixed in the secondary water flow. The concentration of sand is less than 18% in the present experiment. It is confirmed that the dependences of two-phase efficiency curve and of two-phase flow rate ratio curve upon cross section ratio R agrees with those of single phase flow. On the other hand, the effect of particle size appears in the range of decrement of pump efficiency. That is, it is found that the deviation between two phase and single phase efficiency is 10% on average for coarse sand, whereas the deviation is almost zero for fine sand.

Measurements of single-phase and two-phase flows in a vertical pipe using ultrasonic pulse Doppler method and ultrasonic time-domain cross-correlation method

2013 ◽  
Vol 35 (3) ◽  
Author(s):  
Tat Thang Nguyen ◽  
Hiroshige Kikura ◽  
Ngoc Hai Duong ◽  
Hideki Murakawa ◽  
Nobuyoshi Tsuzuki
Keyword(s):  
Time Domain ◽  
Cross Correlation ◽  
Single Phase ◽  
Ultrasonic Pulse ◽  
Phase Flow ◽  
Beam Diameter ◽  
Vertical Pipe ◽  
Two Phase ◽  
Ultrasonic Time ◽  
Pulse Doppler

Ultrasonic Velocity Profile (UVP) method for measurement of single-phase and two-phase flow in a vertical pipe has recently been developed in the Laboratory for industrial and Environmental Fluid Dynamics, Institute of Mechanics, VAST. The signal processings of the UVP method include the ultrasonic pulse Doppler method (UDM)and the ultrasonic time-domain cross-correlation (UTDC) method. For two-phase flow, simultaneous measurements of both liquid and gas are enabled by using a multi-wave ultrasonic transducer (multi-wave TDX). The multi-wave TDX is able to emit and receive ultrasound of two different center frequencies of 2 MHz and 8 MHz at the same time and position. 2 MHz frequency with beam diameter 10 mm is exploited for measurement of gas. 8 MHz one with beam diameter 3 mm is used for liquid. Measurements have been carried out for laminar and turbulent single-phase flows and bubbly counter-current two-phase flows in two flow loops using two vertical pipes of 26 mm inner diameter (I.D.) and 50 mm I.D. respectively. Based on the measured results, assessment of each method is clarified. Applicability of each method for different conditions of pipe flow has been tested. Suggestions for application of the two methods have been recommended.

scholarly journals Measurement of the neutral to charged current cross section ratio in neutrino and antineutrino interactions

1977 ◽  
Vol 71 (1) ◽  
pp. 222-226 ◽  
Author(s):  
M. Holder ◽  
J. Knobloch ◽  
J. May ◽  
H.P. Paar ◽  
P. Palazzi ◽  
...  
Keyword(s):  
Cross Section ◽  
Charged Current ◽  
Cross Section Ratio ◽  
Section Ratio

scholarly journals Measurement of the cross-section ratio σ(χc2)/σ(χc1) for prompt χc production at s=7 TeV

2012 ◽  
Vol 714 (2-5) ◽  
pp. 215-223 ◽  
Author(s):  
R. Aaij ◽  
C. Abellan Beteta ◽  
B. Adeva ◽  
M. Adinolfi ◽  
C. Adrover ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Section Ratio ◽  
Section Ratio ◽  
The Cross

Measuring Flow Pattern Asymmetry of Oil-Water Two Phase Flows Using Multi-channel Rotating Electric Field Conductance Signals

2018 ◽  
Vol 74 (1) ◽  
pp. 25-41 ◽  
Author(s):  
Yuansheng He ◽  
Yingyu Ren ◽  
Yunfeng Han ◽  
Ningde Jin
Keyword(s):  
Electric Field ◽  
Flow Pattern ◽  
Cross Section ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Time Asymmetry ◽  
Pipe Cross Section ◽  
Multi Scale ◽  
Oil Water

AbstractThe present study is a report on the asymmetry of dispersed oil phase in vertical upward oil-water two phase flow. The multi-channel signals of the rotating electric field conductance sensor with eight electrodes are collected in a 20-mm inner diameter pipe, and typical images of low pattern are captured using a high speed camera. With the multi-channel rotating electric field conductance signals collected at pipe cross section, multi-scale time asymmetry (MSA) and an algorithm of multi-scale first-order difference scatter plot are employed to uncover the fluid dynamics of oil-water two phase flow. The results indicate that MSA can characterise the non-linear behaviours of oil-water two phase flow. Besides, the MSA analysis also beneficial for understanding the underlying inhomogeneous distribution of the flow pattern in different directions at pipe cross section.

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