scholarly journals Optimization of Pd Membrane Reactor for Direct Oxidation of Aromatic Compounds

2011 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Milad Rasouli ◽  
Sahar Chitsazan ◽  
Mohammad Hossein Sayyar ◽  
Nakisa Yaghobi ◽  
Babak Bozorgi
Keyword(s):  
Fluid Dynamic ◽  
Active Oxygen Species ◽  
Tubular Reactor ◽  
Direct Oxidation ◽  
Design And Optimization ◽  
Reactor Length ◽  
Length Increase ◽  
Principal Reaction ◽  
Complex Chemical Reactions ◽  
Geometrical Factors

Computational fluid dynamic has already become a widely used and indispensable design and optimization tool in many technical areas. In the present work, the CFD simulations have been coupled with complex chemical reactions to model a membrane tubular reactor which is used to produce phenol from benzene in the vapor phase. Hydrogen dissociates on the palladium layer and reacts with oxygen to give active oxygen species, which attack benzene to produce phenol. In principal, reaction occurs in the surface of palladium and conversion of benzene is increased by changing the length and diameter of the Pd coated PSS tubes. The reactor length and diameter are two geometrical factors which are concerned in the present study. Although increasing the reactor length increase the conversion of benzene to phenol but the concentration of the phenol start to decrease. Based on the data provided by the experiments, a mathematical model has been constructed to conduct a simulation which leads us to an optimum design of a new tubular membrane micro-reactor.

Toluene degradation by heterogeneous photocatalysis assisted with ozone in a tubular reactor: analysis over the reactor length

2021 ◽  
Author(s):  
Bárbara Maria Borges Ribeiro ◽  
Renato Carajelescov Nonato ◽  
Tânia Miyoko Fujimoto ◽  
Bianca Gvozdenovic Medina Bricio ◽  
Ursula Luana Rochetto Doubek ◽  
...  
Keyword(s):  
Tubular Reactor ◽  
Heterogeneous Photocatalysis ◽  
Toluene Degradation ◽  
Reactor Length

Modeling of a Fixed-Bed Reactor for the Production of Phthalic Anhydride

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Amir Rahimi ◽  
Sogand Hamidi
Keyword(s):  
Phthalic Anhydride ◽  
Fixed Bed ◽  
Tubular Reactor ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Conversion Degree ◽  
Reactor Length ◽  
Reactor Temperature ◽  
Reported Data ◽  
Reactor Pressure

In this study, the performance of a fixed–bed tubular reactor for the production of phthalic anhydride is mathematically analyzed. The conversion degree and reactor temperature values are compared with the measured one in a tubular reactor applied in Farabi petrochemical unit in Iran as well as reported data in the literature for a pilot plate. The comparisons are satisfactory. The effects of some operating parameters including reactor length, feed temperature, reactor pressure, and existence of an inert in the catalytic bed are investigated. The optimum value of each parameter is determined on the basis of the corresponding operating conditions.

Electrical and Thermal Layout Design and Optimization Considerations for DPS Active IPEM

2002 ◽  
Author(s):  
Ying Feng Pang ◽  
Jonah Zhou Chen ◽  
Elaine P. Scott ◽  
Karen A. Thole
Keyword(s):  
Thermal Performance ◽  
Fluid Dynamic ◽  
Layout Design ◽  
Maximum Temperature ◽  
3D Finite Element ◽  
Design And Optimization ◽  
Final Design ◽  
Overall Performance ◽  
The Common ◽  
Cfd Analyses

A methodology was developed to optimize the 3D geometrical design layout of an active integrated power electronics module (IPEM) by considering both electrical and thermal performance. This paper is focused on the thermal analysis, which was performed using 3D finite element and computational fluid dynamic (CFD) analyses. A parametric study was conducted to determine the thermal performance of several different design layouts. A sensitivity analysis was performed to determine the overall uncertainty of the predicted simulations. The final design, Gen-II.C, provided a 70% reduction in the common mode current, a 4% reduction in the size of the geometric footprint, and a 3°C reduction in the maximum temperature over Gen-II.A, thus providing an increase in the overall performance.

scholarly journals Multifidelity domain-aware learning for the design of re-entry vehicles

2021 ◽  
Author(s):  
Francesco Di Fiore ◽  
Paolo Maggiore ◽  
Laura Mainini
Keyword(s):  
Thermal Protection ◽  
Fluid Dynamic ◽  
Design Solution ◽  
High Fidelity ◽  
Specific Knowledge ◽  
Dynamic Simulations ◽  
Strongly Coupled ◽  
Design And Optimization ◽  
Domain Specific ◽  
Domain Specific Knowledge

AbstractThe multidisciplinary design optimization (MDO) of re-entry vehicles presents many challenges associated with the plurality of the domains that characterize the design problem and the multi-physics interactions. Aerodynamic and thermodynamic phenomena are strongly coupled and relate to the heat loads that affect the vehicle along the re-entry trajectory, which drive the design of the thermal protection system (TPS). The preliminary design and optimization of re-entry vehicles would benefit from accurate high-fidelity aerothermodynamic analysis, which are usually expensive computational fluid dynamic simulations. We propose an original formulation for multifidelity active learning that considers both the information extracted from data and domain-specific knowledge. Our scheme is developed for the design of re-entry vehicles and is demonstrated for the case of an Orion-like capsule entering the Earth atmosphere. The design process aims to minimize the mass of propellant burned during the entry maneuver, the mass of the TPS, and the temperature experienced by the TPS along the re-entry. The results demonstrate that our multifidelity strategy allows to achieve a sensitive improvement of the design solution with respect to the baseline. In particular, the outcomes of our method are superior to the design obtained through a single-fidelity framework, as a result of the principled selection of a limited number of high-fidelity evaluations.

Fluid Dynamic Design and Optimization of Two Stage Centrifugal Fan for Industrial Burners

2011 ◽  
Author(s):  
C. Ferrari ◽  
M. Pinelli ◽  
P. R. Spina ◽  
P. Bolognin ◽  
L. Borghi
Keyword(s):  
Fluid Dynamic ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Design Stage ◽  
Centrifugal Fan ◽  
Cfd Simulations ◽  
Two Stage ◽  
Dynamic Design ◽  
Design And Optimization ◽  
Preliminary Design Stage

In this paper, the fluid dynamic design of a two-stage centrifugal fan for industrial burner application is presented. The design is carried out by means of an integrated 1D/3D numerical procedure based on the use of CFD simulations. The CFD simulations are used either at the preliminary design stage to choose among competitive one- or two-dimensional geometries and then to test the generated three-dimensional geometries. The results show how the different design choices could impact on the performance parameters and, finally, how the analysis of the various alternatives allows the determination of the overall geometry of a complete and performing two-stage centrifugal fan.

Design of a Quench Device for Synthesis and Hydrolysis of Zn Nanoparticles: Flow Modeling and Experiments

2008 ◽  
Author(s):  
Aiman Alshare ◽  
Tareq Abu Hamed ◽  
Marc Bru¨lhart ◽  
Luke Venstrom ◽  
Jane H. Davidson
Keyword(s):  
Particle Deposition ◽  
Fluid Dynamic ◽  
Tubular Reactor ◽  
Numerical Data ◽  
Confined Jets ◽  
Zinc Nanoparticles ◽  
Modeling And Experiments ◽  
The Impact ◽  
Hydrolysis Of ◽  
Reactor Surface

The synthesis and hydrolysis of zinc nanoparticles are carried out in a tubular reactor. A key component of the reactor is a coaxial jet quench device. Three co-axial and multi-inlet confined jets mix Zn(g), steam and argon to produce and hydrolyze zinc nanoparticles. The performance of the quench device is assessed with computational fluid dynamic modeling and measurements of hydrogen conversion and particle size and composition. Numerical data elucidate the impact of varying jet flow rates on temperature and velocity distributions within the reactor. Experiments produce hydrogen conversions of 61 to 79%. Particle deposition on sections of the reactor surface above 650 K favors hydrolysis. Residence time for in-flight particles is less than one second and these particles are partially hydrolyzed.

scholarly journals A General Review of the Current Development of Mechanically Agitated Vessels

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 982 ◽  
Author(s):  
Marek Jaszczur ◽  
Anna Młynarczykowska
Keyword(s):  
Fluid Dynamic ◽  
Flow Analysis ◽  
Mixing Efficiency ◽  
Two Phase ◽  
Complex Interactions ◽  
Current State ◽  
Dynamic Techniques ◽  
Widespread Phenomenon ◽  
Geometrical Factors ◽  
Solid Liquid

The mixing process in a mechanically agitated vessel is a widespread phenomenon which plays an important role among industrial processes. In that process, one of the crucial parameters, the mixing efficiency, depends on a large number of geometrical factors, as well as process parameters and complex interactions between the phases which are still not well understood. In the last decade, large progress has been made in optimisation, construction and numerical and experimental analysis of mechanically agitated vessels. In this review, the current state in this field has been presented. It shows that advanced computational fluid dynamic techniques for multiphase flow analysis with reactions and modern experimental techniques can be used with success to analyse in detail mixing features in liquid-liquid, gas-liquid, solid-liquid and in more than two-phase flows. The objective is to show the most important research recently carried out.

CFD Simulation of Airflow Organization in the Ship Accommodation

2014 ◽  
Vol 711 ◽  
pp. 91-95
Author(s):  
Kun Zhang ◽  
Hai Xu Li ◽  
Jin Ling Wang
Keyword(s):  
Air Conditioning ◽  
High Performance ◽  
Cfd Simulation ◽  
Simulation Analysis ◽  
Fluid Dynamic ◽  
Temperature Fields ◽  
Design Stage ◽  
Air Conditioning System ◽  
Design And Optimization ◽  
Airflow Distribution

Efficient ventilation and sound air current are significant to improve indoor air quality (IAQ) and control the contamination concentration. Healthy and comfort air conditioning will provide a strong guarantee for high-performance work. While limited by lots of conditions, the airflow distribution in room is very difficult to be revealed, so numerical simulation and analysis for airflow organization become more and more important during the design stage of ventilation and air conditioning system. In the paper a ship accommodation is taken as a model to do simulation analysis on the effect of different airflow organizations. On the basis of computational fluid dynamic (CFD) theory and methodology, the temperature fields, velocity fields and air age fields under different airflow organizations are gotten by means of Airpak3.1. All these search works will be helpful for the further design and optimization for the ventilation and air conditioning system of the ship accommodation.

scholarly journals A Review on Design and optimization of shell and tube heat exchanger by varying parameters

2020 ◽  
Vol 6 (6) ◽  
Author(s):  
Shiv Kumar ◽  
Dharamveer Singh
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Fluid Dynamic ◽  
Exchange Process ◽  
Cost Savings ◽  
Thermal Control ◽  
Tube Heat Exchanger ◽  
Design And Optimization ◽  
Compact Heat Exchangers ◽  
Computation Fluid Dynamic

In recent years, thermal control systems performance has improved in numerous ways due to developments in control theory and information technology. Efforts have been made to produce more efficient heat exchangers by employing various methods of heat transfer enhancement.  An increase in heat exchanger performance can lead to a more economical design of heat exchanger which can help to make energy, material & cost savings related to a heat exchange process. Compact heat exchangers (CHEs) technologies are expected to be one of the solutions for the new generation heat exchanger.  In this paper are presented of the compact heat exchanger, Plate-fin heat exchanger, and Printed Circuit Heat Exchanger. And computation fluid dynamic is used which offers an alternative to the quick and inexpensive solution for the design and optimization of compact heat exchangers.

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