scholarly journals Oscillatory three-phase flow reactor for studies of bi-phasic catalytic reactions

2015 ◽  
Vol 51 (43) ◽  
pp. 8916-8919 ◽  
Author(s):  
Milad Abolhasani ◽  
Nicholas C. Bruno ◽  
Klavs F. Jensen
Keyword(s):  
Mass Transfer ◽  
Oscillatory Flow ◽  
Flow Reactor ◽  
Catalytic Reactions ◽  
Phase Flow ◽  
Three Phase ◽  
Three Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Time Limitations

Oscillatory flow reactor strategy removes the mixing, mass transfer and residence time limitations associated with continuous multi-phase flow approaches for studies of bi-phasic C–C and C–N catalytic reactions.

scholarly journals A maximum principle for multiphase flow models

2017 ◽  
pp. 138-145
Author(s):  
К.А. Новиков
Keyword(s):  
Maximum Principle ◽  
Flow Model ◽  
Maximum Principles ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Models ◽  
Three Phase ◽  
Three Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase

Сформулированы и доказаны принципы максимума для нескольких моделей многофазной фильтрации. Первый принцип справедлив для фазовых насыщенностей в несжимаемом случае модели двухфазной фильтрации с постоянными вязкостями, а второй - для глобального давления в моделях двух- и трехфазной фильтрации Two maximum principles for several multi-phase flow models are formulated and proved. The first one is valid for phase saturations in an incompressible two-phase flow model with constant viscosities. The second one is valid for the global pressure in two- and three-phase flow models with constant viscosities and is also valid for phase pressures in the case of zero capillary pressure.

Experimental Study on the Characteristics of Modified Ca-Based Sorbents and its Mercury Adsorption Capability in the Flue Gas

2012 ◽  
Vol 424-425 ◽  
pp. 971-976
Author(s):  
Peng Wang ◽  
Jiang Wu ◽  
Ping He ◽  
Jie He Chen ◽  
Qian Yan Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Electric Power ◽  
Flue Gas ◽  
Flow Reactor ◽  
Phase Flow ◽  
Mercury Adsorption ◽  
Multi Phase Flow ◽  
Removal Efficiencies ◽  
Multi Phase ◽  
Adsorption Capability

In this paper, Ca-based sorbent, Ca(OH)2 and CaCO3, was modified with different concentration of KMnO4 and their mercury adsorption capability in the flue gas was experimentally conducted by using a lab-scale multi-phase flow reactor system developed by Shanghai University of Electric Power, and the result showed that the removal efficiency of flue gas mercury of Ca-based sorbent was greatly improved with modification by different concentration of KMnO4, and the removal efficiencies were 80.92%，85.38%，82.35%，83.51% and 89.84% respectively. The removal efficiencies of Ca(OH)2 modified with KMnO4 is increased significantly may be because strong oxidation of KMnO4 made Hg0 convert into oxidized mercury, Hg2 +, which is easier to be removed, as well as, the modification by KMnO4 may change the surface properties of Ca(OH)2 so that it became more active to capture mercury in the flue gas.

scholarly journals Multi-phase flow assessment for the fermentation process in mono-substrate reactor with skeleton bed

2019 ◽  
Vol 42 (1) ◽  
pp. 150-156
Author(s):  
Grzegorz Wałowski
Keyword(s):  
Reynolds Number ◽  
Fermentation Process ◽  
Flow Reactor ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Production Cycle ◽  
Phase Flow ◽  
Pig Slurry ◽  
Multi Phase Flow ◽  
Multi Phase

Abstract The selected techniques were reviewed and their technological aspects were characterized in the context of multi-phase flow for biogas production. The conditions of anaerobic fermentation for pig slurry in a mono-substrate reactor with skeleton bed were analysed. The required technical and technological criteria for producing raw biogas were indicated. Design and construction of the mono-substrate model, biogas flow reactor, developed for cooperation with livestock buildings of various sizes and power from 2.5 kW to 40 kW. The installation has the form of a sealed fermentation tank filled with a skeletal deposit constituting a peculiar spatial system with regular shapes and a rough surface. Incorporating a plant in such a production cycle that enables the entire slurry stream to be directed from the cowshed or pig house underrun channels to the reactor operating in the flow mode, where anaerobic digestion will take place, allows to obtain a biogas. The paper presents preliminary results of experimental investigations in the field of hydrodynamic substrate mixing system for biogas flow assessment by the adhesive bed in the context of biogas production. The aim of the study was to assessment and shows the influence of the Reynolds number on the biogas resistance factor for the fermentation process in mono-substrate reactor with adhesive deposit. The measurement results indicate a clear effect of the Reynolds number in relation to the descending flow resistance coefficient for the adhesive bed.

Study of Sensor of Electrical Capacitance Tomography (ECT) System Based on COMSOL

2013 ◽  
Vol 734-737 ◽  
pp. 3016-3021 ◽  
Author(s):  
Hai Yan Cao ◽  
Xue Mei Duan ◽  
Hua Xiang Wang
Keyword(s):  
Electrical Capacitance Tomography ◽  
Phase Flow ◽  
Electrical Capacitance ◽  
Two Phase ◽  
Simulation Research ◽  
Three Phase Flow ◽  
Multi Phase Flow ◽  
A New Technique ◽  
Multi Phase ◽  
Capacitance Tomography

Electrical Capacitance Tomography technique is a new technique for multi-phase flow measurement. With broad application prospects, the purpose of this technique is to identify each phases composition of two-phase/multi-phase flow system in a closed pipe. A new method COMSOL was used to analysis the electrical capacitance tomography of reconstruction image and simulation research. First of all, different electrical models were established, and the reconstruction images of four kinds of representative flow were achieved; In addition, through simulation study of the field with disperse phase, the influence of the electrode number, shielding case and radial electrode to the imaging quality were analyzed; Finally, the reconstruction images of three-phase flow were achieved to obtain the satisfactory result.

Mass Transfer on Multiphase Transitions in Low-Temperature Carbon-Dioxide Floods

SPE Journal ◽  
2014 ◽  
Vol 19 (06) ◽  
pp. 1005-1023 ◽  
Author(s):  
R.. Okuno ◽  
Z.. Xu
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Low Temperature ◽  
Numerical Dispersion ◽  
Phase Flow ◽  
Three Phase ◽  
Three Phase Flow ◽  
Tie Line ◽  
Composition Path ◽  
Three Phases

Summary Mixtures of reservoir oil and carbon dioxide (CO2) can exhibit complex multiphase behavior at temperatures typically less than 120°F, in which a third CO2-rich liquid (L2) phase can coexist with the oleic (L1) and gaseous (V) phases. The three-phase behavior is bounded by two types of critical endpoints (CEPs) in composition space. The lower CEP (LCEP) is a tie line in which the two liquid phases merge in the presence of the V phase, and the upper CEP (UCEP) is a tie line in which the L2 and V phases merge in the presence of the L1 phase. Slimtube tests reported in the literature show that low-temperature oil displacement by CO2 can result in the high displacement efficiency of more than 90% when three phases are present during the displacement. The nearly piston-like displacements can be quantitatively reproduced in numerical simulations when the CEP behavior is properly considered. However, it is uncertain how multicontact miscibility (MCM) is developed through the interaction of flow and three-hydrocarbon-phase behavior. This research presents a detailed analysis of mass conservation on multiphase transitions between two and three phases for the limiting three-phase flow, where the L1 phase is completely displaced by the L2 phase on the LCEP. The analysis indicates that interphase mass transfer on multiphase transitions occurs in the most-efficient way for MCM development. Simple analytical conditions derived for MCM through three phases are applied to 1D fine-scale simulations of CO2 floods by use of four and more components. Results show that the MCM conditions are nearly satisfied when the effect of numerical dispersion is small. MCM is likely developed through three hydrocarbon phases on the LCEP in the cases studied. This is consistent with analytical solutions of water and gas injection presented in the literature, in which MCM is developed on a CEP for the aqueous, V, and L1 phases. For MCM cases in this research, the L2-V two phases are present upstream of the miscible front if the composition path does not go through the UCEP tie line. However, they also can be miscible on the non-L1 edge of the UCEP tie line if the MCM composition path goes through it. Three-phase flow gradually changes to two-phase flow with varying pressure in the presence of numerical dispersion. It is shown that interphase mass transfer on multiphase transitions becomes less efficient during the change until the three-phase region completely disappears.

Design and Testing of Instrumentation for Multi-Phase Flow Sampling and Local Void Fraction Measurement

2011 ◽  
Author(s):  
Yihong Yang ◽  
Demetri P. Telionis
Keyword(s):  
Void Fraction ◽  
Bubbly Flow ◽  
Calibration Procedure ◽  
Phase Flow ◽  
Flotation Cells ◽  
Three Phase Flow ◽  
Extensive Test ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Fraction Measurement

Instrumentation is available to obtain samples and then measure the local void fraction as well as the size and number density of bubbles and/or particles in two and three-phase flow. But in most cases, these methods interfere with the flow and bias the sampling process. We have developed an isokinetic probe that can take accurate samples without changing the sample’s composites. This is achieved by aligning the probe’s intake nozzle with the flow’s local predominant direction and matching its internal pressure with its hydrodynamic environment and hence equalizing the inside and outside velocities. Then the fluid sample’s density is measured to calculate the local void fraction. The calibration procedure and results as well as extensive test data obtained in bubbly-flow tunnel and flotation cells respectively are presented and discussed.

Three-Phase Flow Calculation With Conservative Semi-Lagrangian CIP Method

2002 ◽  
Author(s):  
T. Yabe ◽  
F. Xiao ◽  
K. Takizawa ◽  
K. Sakurai
Keyword(s):  
Mass Conservation ◽  
Phase Flow ◽  
Cip Method ◽  
Exact Mass ◽  
Comprehensive Review ◽  
Three Phase ◽  
Three Phase Flow ◽  
Multi Phase ◽  
Lagrangian Scheme ◽  
Recent Version

We present a review of the CIP method, which is a kind of semi-Lagrangian scheme and has been extended to treat incompressible flow in the framework of compressible fluid. Since it uses primitive Euler representation, it is suitable for multi-phase analysis. The recent version of this method guarantees the exact mass conservation even in the framework of semi-Lagrangian scheme. Comprehensive review is given for the strategy of the CIP method that has a compact support and sub-cell resolution including front capturing algorithm with functional transformation.

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