scholarly journals Research on the Utilization of Saline Alkali Water Resources Based on Two-Phase Flow

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2994
Author(s):  
Zhilin Sun ◽  
Yang Yang ◽  
Wenrong Tu ◽  
Qiuyue Hu ◽  
Chaoqun Zhai
Keyword(s):  
Water Resources ◽  
Two Phase Flow ◽  
Saline Water ◽  
Soil Salinization ◽  
Economic Benefits ◽  
Phase Flow ◽  
Flash Evaporation ◽  
Two Phase ◽  
Theoretical Derivation ◽  
Local Saline

In order to reasonably use solar energy to solve problems such as land desertification and soil salinization in Southern Xinjiang, this paper proposes a system combining photothermal and flash evaporation technologies, which use local saline water for desalination treatment to achieve secondary utilization of water resources. Firstly, we introduce the whole system of the photovoltaic desalination plant. As an important heat-collecting element of the system, the solar tube is the key to whether this plant can work efficiently. Then, we carry out the detection and theoretical derivation of data along the tube. We establish a two-phase flow model of saline water in the tube, considering convective heat transfer, and define the formula of the heat collecting efficiency factor. Finally, based on iterative calculation, the temperature trend of the tube and the change law of the two-phase flow are obtained, and the ecological and economic benefits and energy efficiency of the system are analyzed.

Study on Void Fraction Measurement Model of Gas-Liquid Two-Phase Flow Based on the Differential Pressure Sensor

2013 ◽  
Vol 816-817 ◽  
pp. 924-927
Author(s):  
Li De Fang ◽  
Qing He ◽  
Yao Zhang ◽  
Yu Jiao Liang
Keyword(s):  
Void Fraction ◽  
Pressure Sensor ◽  
Two Phase Flow ◽  
Measurement Model ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Theoretical Derivation ◽  
Differential Pressure Sensor ◽  
Superficial Gas Velocity

The paper bases on the differential pressure signal measured by the differential pressure sensor for the study and measurement of gas-liquid two-phase flow void fraction. We compare theory section void fraction and practical section void fraction with superficial gas velocity, the theoretical derivation formula has been observed and qualitatively explained.

A two-phase flow approach for modeling blood stasis and estimating the thrombosis potential of a ventricular assist device

2020 ◽  
pp. 039139882097540
Author(s):  
Wei-Feng Dai ◽  
Peng Wu ◽  
Guang-Mao Liu
Keyword(s):  
Two Phase Flow ◽  
Blood Stasis ◽  
Economic Benefits ◽  
Experimental Results ◽  
Ventricular Assist Devices ◽  
Phase Flow ◽  
Two Phase ◽  
Ventricular Assist ◽  
Relative Residence Time ◽  
Blood Pumps

Thrombosis and its related events have become a major concern during the development and optimization of ventricular assist devices (VADs, also called blood pumps), and limit their clinical use and economic benefits. Attempts have been made to model the thrombosis formation, considering hemodynamic and biochemical processes. However, the complexities and computational expenses are prohibitive. Blood stasis is one of the key factors which may lead to the formation of thrombosis and excessive thromboembolic risks for patients. This study proposed a novel approach for modeling blood stasis, based on a two-phase flow principle. The locations of blood residual can be tracked over time, so that regions of blood stasis can be identified. The blood stasis in an axial blood pump is simulated under various working conditions, the results agree well with the experimental results. In contrast, conventional hemodynamic metrics such as velocity, time-averaged wall shear stress (TAWSS), and relative residence time (RRT), were contradictory in judging risk of blood stasis and thrombosis, and inconsistent with experimental results. We also found that the pump operating at the designed rotational speed is less prone to blood stasis. The model provides an efficient and fast alternative for evaluating blood stasis and thrombosis potential in blood pumps, and will be a valuable addition to the tools to support the design and improvement of VADs.

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