Experimental Research on Velocity Distribution and Attenuation Characteristic of Spiral Flow by Laser Doppler Velocimeter

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Rao Yongchao ◽  
Wang Shuli ◽  
Zhou Shidong ◽  
Li Entian ◽  
Liu Wenming
Keyword(s):  
Velocity Distribution ◽  
Tangential Velocity ◽  
Hydrate Formation ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Spiral Flow ◽  
Horizontal Pipe ◽  
Attenuation Characteristic ◽  
Working Medium ◽  
Gas Hydrate Formation

An experimental study was conducted to get more insight into the flowing characteristics of single phase spiral flow in the horizontal pipe by the use of a laser Doppler velocimeter (LDV). Water was used as the working medium, and the spiral motion was produced by a vane. The vanes with different spiral angles and vane area were self-made. Influence of flow attenuation, average Reynolds number, spiral angle, and vane area on axial velocity distribution and tangential velocity distribution were studied. Turbulence intensity distribution was studied, and the spiral strength attenuation law was analyzed. The experimental results show that the vane is an efficient spiral device with low pressure drop, and it is used in pipeline, natural gas hydrate formation, and so on.

Investigation on gas hydrate formation properties in a spiral flow using a flow loop

2020 ◽  
Vol 25 (3) ◽  
pp. 292
Author(s):  
Boyang Ding ◽  
Yongchao Rao ◽  
Minguan Yang ◽  
Yi Sun ◽  
Shuli Wang ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Hydrate Formation ◽  
Flow Loop ◽  
Spiral Flow ◽  
Gas Hydrate Formation

Investigation on gas hydrate formation properties in a spiral flow using a flow loop

2020 ◽  
Vol 25 (3) ◽  
pp. 292
Author(s):  
Yongchao Rao ◽  
Yi Sun ◽  
Shuli Wang ◽  
Hao Ge ◽  
Boyang Ding ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Hydrate Formation ◽  
Flow Loop ◽  
Spiral Flow ◽  
Gas Hydrate Formation

Fluid Field Analysis for Cyclone Separator Used on Grain Cleaning

2012 ◽  
Vol 605-607 ◽  
pp. 1369-1371
Author(s):  
Ling Xin Geng ◽  
Li Jian Zhang ◽  
Qing Xiang Shi
Keyword(s):  
Radial Velocity ◽  
Axial Velocity ◽  
Tangential Velocity ◽  
Laser Doppler ◽  
Field Analysis ◽  
Laser Doppler Velocimeter ◽  
Structure Parameters ◽  
Cyclone Separator ◽  
Gas Velocity ◽  
Fluid Field

Gas velocity in cyclone separator is measured by testing with laser Doppler velocimeter in this paper. The measuring results indicates that tangential velocity, axial velocity, radial velocity of air distribute following some certain rules, reasonable selected structure parameters can improve separating efficiency

Two-beam fiber laser Doppler velocimeter enabling velocity distribution measurement of liquid flow

2011 ◽  
Author(s):  
Anas Luqman Bin Muhamad ◽  
Atsushi Ugajin ◽  
Osamu Mikami ◽  
Toshio Okazaki ◽  
Yuzo Yoshikuni
Keyword(s):  
Velocity Distribution ◽  
Fiber Laser ◽  
Liquid Flow ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Distribution Measurement

Does Local Structure Bias How a Crystal Nucleus Evolves?

2018 ◽  
Author(s):  
Kyle Hall ◽  
Zhengcai Zhang ◽  
Christian Burnham ◽  
Guang-Jun Guo ◽  
Sheelagh Carpendale ◽  
...  
Keyword(s):  
Local Structure ◽  
Molecular Level ◽  
Hydrate Formation ◽  
Mixed Gas ◽  
Local Structures ◽  
Surrounding Environment ◽  
Gas Hydrate Formation ◽  
Significant Research ◽  
Crystal Phases ◽  
Recent Experimental Work

<p>The broad scientific and technological importance of crystallization has led to significant research probing and rationalizing crystallization processes, particularly how nascent</p> <p>crystal phases appear. Previous work has generally neglected the possibility of the molecular-level dynamics of individual nuclei coupling to local structures (e.g., that of the nucleus and its</p> <p>surrounding environment). However, recent experimental work has conjectured that this can occur. Therefore, to address a deficiency in scientific understanding of crystallization, we have</p> <p>probed the nucleation of prototypical single and multi-component crystals (specifically, ice and mixed gas hydrates). Here, we establish that local structures can bias the evolution of nascent</p> <p>crystal phases on a nanosecond timescale by, for example, promoting the appearance or disappearance of specific crystal motifs, and thus reveal a new facet of crystallization behaviour.</p> <p>Analysis of the crystallization literature confirms that structural biases are likely present during crystallization processes beyond ice and gas hydrate formation. Moreover, we demonstrate that</p> <p>structurally-biased dynamics are a lens for understanding existing computational and experimental results while pointing to future opportunities.</p>

Does Local Structure Bias How a Crystal Nucleus Evolves?

2018 ◽  
Author(s):  
Kyle Hall ◽  
Zhengcai Zhang ◽  
Christian Burnham ◽  
Guang-Jun Guo ◽  
Sheelagh Carpendale ◽  
...  
Keyword(s):  
Local Structure ◽  
Molecular Level ◽  
Hydrate Formation ◽  
Mixed Gas ◽  
Local Structures ◽  
Surrounding Environment ◽  
Gas Hydrate Formation ◽  
Significant Research ◽  
Crystal Phases ◽  
Recent Experimental Work

<p>The broad scientific and technological importance of crystallization has led to significant research probing and rationalizing crystallization processes, particularly how nascent</p> <p>crystal phases appear. Previous work has generally neglected the possibility of the molecular-level dynamics of individual nuclei coupling to local structures (e.g., that of the nucleus and its</p> <p>surrounding environment). However, recent experimental work has conjectured that this can occur. Therefore, to address a deficiency in scientific understanding of crystallization, we have</p> <p>probed the nucleation of prototypical single and multi-component crystals (specifically, ice and mixed gas hydrates). Here, we establish that local structures can bias the evolution of nascent</p> <p>crystal phases on a nanosecond timescale by, for example, promoting the appearance or disappearance of specific crystal motifs, and thus reveal a new facet of crystallization behaviour.</p> <p>Analysis of the crystallization literature confirms that structural biases are likely present during crystallization processes beyond ice and gas hydrate formation. Moreover, we demonstrate that</p> <p>structurally-biased dynamics are a lens for understanding existing computational and experimental results while pointing to future opportunities.</p>

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