Multiphase Flow for Energy, Water and Food Applications

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 5478

Special Issue Editor


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Guest Editor
School of Engineering, University of Guelph, 50 Stone Rd, Guelph, ON N1G 2W1, Canada
Interests: multiphase flow; fluid mechanics; thermofluids

Special Issue Information

Dear Colleagues,

Multiphase flows take place in a wide range of engineering applications such as power generation, water treatment, oil production, water desalination, refrigeration and air conditioning, and carbon capture and sequestration, as well as in other systems such as food and material handling processes. In order to achieve high efficiency and safe operation at low operation cost of these systems, accurate prediction of system performance at the best operating conditions is needed. The conventional analyses based on overall system performance and average thermo-fluid properties, are not adequate to achieve such efficient performance. This is because energy generation is associated with two-phase flow heat and mass transfer and change in phase. Therefore, accurate prediction of two-phase flow parameters is essential to obtain efficient sustainable energy systems. However, several challenges are encountered when analyzing two-phase flows. This is due to the interaction between phases, the behavior of the deformable phase, and the different flow patterns and their changes throughout the piping system and components. Additional complexities arise when the two-phase passes through multiple piping components located close to each other or continuous phase change or chemical interaction occur. This severely affects both the safety and reliability of energy or oil and gas transportation systems and sometimes leads to fatalities and huge economic loss. Achieving high-performance in food processing or water treatment systems require detailed analysis of multiphase mixtures in these systems. This Special Issue will provide an overview of typical two-phase flow challenges and solution approaches in water, energy, and food applications.

Prof. Dr. Wael H. Ahmed
Guest Editor

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Keywords

  • multiphase flow
  • heat transfer
  • phase change
  • energy systems
  • mixing
  • mass transfer
  • turbulence
  • gas-solid mixtures
  • liquid-liquid mixtures
  • computational modeling of multiphase flow
  • interfacial phenomena
  • non-Newtonian fluids

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Published Papers (1 paper)

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Research

17 pages, 5437 KiB  
Article
Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications
by Rashal Abed, Mohamed M. Hussein, Wael H. Ahmed and Sherif Abdou
Fluids 2021, 6(6), 226; https://doi.org/10.3390/fluids6060226 - 16 Jun 2021
Cited by 7 | Viewed by 3550
Abstract
Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture [...] Read more.
Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser. Full article
(This article belongs to the Special Issue Multiphase Flow for Energy, Water and Food Applications)
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