Estimation of Hydrokinetic Pressure and Fluidic Drag Changes during Pipe Installations via HDD Based on Identifying Slurry-Flow Pattern Change within a Borehole

A microfluidic mixing device for microsystems with electroosmotic flow (EOF)-driven liquid pumping is proposed and examined experimentally and numerically. Microchannels with SiO2 or Al2O3 wall are fabricated by using surface micromachining technique, and the EOF velocity for each microchannel is measured. A sample device where part of the SiO2 wall is covered with a patterned Al2O3 thin film is fabricated to demonstrate the proposed flow pattern change. Results of numerical calculations suggest mixing enhancement effect.

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Flow pattern change in horizontal rectangular laterally ribbed ducts through alteration of the ribs thickness and pitch

International Journal of Multiphase Flow ◽

10.1016/j.ijmultiphaseflow.2013.02.006 ◽

2013 ◽

Vol 54 ◽

pp. 11-21 ◽

Cited By ~ 4

Author(s):

Mohammad Reza Ansari ◽

Reza Gheisari ◽

Mohsen Azadi

Keyword(s):

Flow Pattern ◽

Pattern Change

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LSTM Model Based on Multi-Feature Extractor to Detect Flow Pattern Change Characteristics and Parameter Measurement

IEEE Sensors Journal ◽

10.1109/jsen.2020.3024294 ◽

2020 ◽

pp. 1-1

Author(s):

Zhuoqun Xu ◽

Fan Wu ◽

Liying Zhu ◽

Yi Li

Keyword(s):

Flow Pattern ◽

Parameter Measurement ◽

Model Based ◽

Pattern Change ◽

Change Characteristics ◽

Feature Extractor

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Pengaruh Liquid Hold-Up terhadap Transisi Pola Aliran 2 Fasa Air-Udara dari Stratified Ke Slug pada Pipa 50 mm

Journal of Science and Application Technology ◽

10.35472/jsat.v4i2.279 ◽

2020 ◽

Vol 4 (2) ◽

pp. 75

Author(s):

Andinusa Rahmandhika ◽

Ali Saifullah ◽

Pathur Razi Ansyah ◽

Ali Mokhtar

Keyword(s):

Film Thickness ◽

Flow Pattern ◽

Slug Flow ◽

High Speed ◽

Current Method ◽

High Speed Camera ◽

Visual Data ◽

Liquid Slug ◽

Pattern Change ◽

Piping Systems

The slug flow pattern is one of the most avoiding factors in piping systems due to its destructive characteristics. Research on the criteria of the slug formation is still the concern. The present study focused on finding out the influence of liquid hold-up toward the transition of the flow pattern from stratified to slug pattern. It was conducted on a 50 mm-diameter horizontal acrylic pipe. The visual data was obtained from a fully developed area (180-210 D) by variations of liquid superficial rate (JL) of 0,03-0,3 m/s and gas superficial rate (JG) from 0,7 to 3,77 m/s. The high-speed camera with 2000 fps recording speed was the instrument to obtain the visual data. The measurement of the liquid hold-up is made by Constant Electric Current Method (CECM). The drastic decrement of liquid hold-up value on the wave growth mechanism (JG ≤ 1,88 m/s) indicated the changes in flow patterns from the stratified to the slug pattern, while on the wave coalescence mechanism (JG > 1,88 m/s) the liquid hold-up remains increases. The pattern change from pseudo slug to the slug pattern was not decreasing on its film thickness, yet, it tends to increase the frequency and the liquid slug length.

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