Multidimensional Simulation of the Two-Phase Flow Downstream of Spillways for Total Dissolved Gas Prediction

2005 ◽  
Author(s):  
M. Politano ◽  
P. Carrica ◽  
C. Turan ◽  
L. Weber
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Total Dissolved Gas

Investigation into the Total Dissolved Gas Dynamics of Wells Dam Using a Two-Phase Flow Model

2011 ◽  
Vol 137 (10) ◽  
pp. 1257-1268 ◽  
Author(s):  
M. Politano ◽  
A. Arenas Amado ◽  
S. Bickford ◽  
J. Murauskas ◽  
D. Hay
Keyword(s):  
Gas Dynamics ◽  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Total Dissolved Gas

A parameter analysis of a two-phase flow model for supersaturated total dissolved gas downstream spillways

2016 ◽  
Vol 28 (4) ◽  
pp. 648-657 ◽  
Author(s):  
Hui-xia Yang ◽  
Ran Li ◽  
Rui-feng Liang ◽  
Juan Wei ◽  
Qin Zhang
Keyword(s):  
Flow Model ◽  
Two Phase Flow ◽  
Parameter Analysis ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Total Dissolved Gas

Two-phase flow simulation of supersaturated total dissolved gas in the plunge pool of a high dam

2016 ◽  
Vol 35 (4) ◽  
pp. 1139-1148 ◽  
Author(s):  
Qian Ma ◽  
Ran Li ◽  
Qin Zhang ◽  
Ben R. Hodges ◽  
Jingjie Feng ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Flow Simulation ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Total Dissolved Gas ◽  
Plunge Pool

A multidimensional two-phase flow model for the total dissolved gas downstream of spillways

2007 ◽  
Vol 45 (2) ◽  
pp. 165-177 ◽  
Author(s):  
Marcela S. Politano ◽  
Pablo M. Carrica ◽  
Cagri Turan ◽  
Larry Weber
Keyword(s):  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Total Dissolved Gas

scholarly journals A Modular Millifluidic Platform for the Synthesis of Iron Oxide Nanoparticles with Control over Dissolved Gas and Flow Configuration

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1019 ◽  
Author(s):  
Luca Panariello ◽  
Gaowei Wu ◽  
Maximilian O. Besenhard ◽  
Katerina Loizou ◽  
Liudmyla Storozhuk ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Flow Pattern ◽  
Iron Oxide Nanoparticles ◽  
Single Phase ◽  
Two Phase Flow ◽  
Oxide Nanoparticles ◽  
Phase Flow ◽  
Dissolved Gas ◽  
Two Phase ◽  
Modular Units

Gas–liquid reactions are poorly explored in the context of nanomaterials synthesis, despite evidence of significant effects of dissolved gas on nanoparticle properties. This applies to the aqueous synthesis of iron oxide nanoparticles, where gaseous reactants can influence reaction rate, particle size and crystal structure. Conventional batch reactors offer poor control of gas–liquid mass transfer due to lack of control on the gas–liquid interface and are often unsafe when used at high pressure. This work describes the design of a modular flow platform for the water-based synthesis of iron oxide nanoparticles through the oxidative hydrolysis of Fe2+ salts, targeting magnetic hyperthermia applications. Four different reactor systems were designed through the assembly of two modular units, allowing control over the type of gas dissolved in the solution, as well as the flow pattern within the reactor (single-phase and liquid–liquid two-phase flow). The two modular units consisted of a coiled millireactor and a tube-in-tube gas–liquid contactor. The straightforward pressurization of the system allows control over the concentration of gas dissolved in the reactive solution and the ability to operate the reactor at a temperature above the solvent boiling point. The variables controlled in the flow system (temperature, flow pattern and dissolved gaseous reactants) allowed full conversion of the iron precursor to magnetite/maghemite nanocrystals in just 3 min, as compared to several hours normally employed in batch. The single-phase configuration of the flow platform allowed the synthesis of particles with sizes between 26.5 nm (in the presence of carbon monoxide) and 34 nm. On the other hand, the liquid–liquid two-phase flow reactor showed possible evidence of interfacial absorption, leading to particles with different morphology compared to their batch counterpart. When exposed to an alternating magnetic field, the particles produced by the four flow systems showed ILP (intrinsic loss parameter) values between 1.2 and 2.7 nHm2/kg. Scale up by a factor of 5 of one of the configurations was also demonstrated. The scaled-up system led to the synthesis of nanoparticles of equivalent quality to those produced with the small-scale reactor system. The equivalence between the two systems is supported by a simple analysis of the transport phenomena in the small and large-scale setups.

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