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article

Influence of Powder Bed Characteristics on Material Quality in Additive Manufacturing

Jonas Zielinski, Simon Vervoort, Hans-Wilfried Mindt, Mustafa Megahed

BHM Berg- und Hüttenmännische Monatshefte > 2017 > 162 > 5 > 192-198

In powder bed based Additive Manufacturing (AM) processes like Selective Laser Melting (SLM) or Electron Beam Melting (EBM), the spatial distribution of the individual powder particles is typically unknown. Nevertheless, the distribution of particles in the heat affected zone defines the thermophysical properties of the region being processed by the heat source and therefore plays a crucial role in...

article

The problem of airflow around building clusters in different configurations

Jędrzejewski, Mateusz, Poćwierz, Marta, Zielonko-Jung, Katarzyna, Jędrzejewski, Mateusz, more

Archive of Mechanical Engineering > 2017 > 64 > 3

article

Mesh size effect on CFD simulation of gas-fluidized Geldart A particles

P.C. Sande, S. Ray, P.C. Sande, S. Ray

Powder Technology > 2014 > 264 > Complete > 43-53

We investigate the effect of mesh size on CFD simulations of a lab-scale sized fluidized bed of Geldart A particles using two-fluid model (TFM), specifically for homogeneous expansion and transition to bubbling. For the first time we have shown a set of lab-scale domain size fine mesh simulations. In this context transient bed voidage profiles have been analyzed in detail. TFM follows the Eulerian–Eulerian...

article

Analyzing the effect of using axial impellers in large‐scale bioreactors

Sören Bernauer, Philipp Eibl, Christian Witz, Johannes Khinast, more

Biotechnology and Bioengineering > 119 > 9 > 2494 - 2504

In high‐performance industrial fermentation processes, stirring and aeration may account for significant production costs. Compared to the widely applied Rushton impellers, axial‐pumping impellers are known to yield a lower power draw and at the same time improve mixing. However, their lower gas dispersion capability requires stronger agitation, compromising these benefits. Diverse advanced impeller...

article

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

Yu Yang, Zhiying Ren, Youxi Lin, Linlin Li, more

AIChE Journal > 68 > 6 > n/a - n/a

Due to the trade‐off between purity and flux, the development of high‐purity, high‐flux oil–water separation materials is still an arduous challenge. Herein, to achieve emulsion separation with high purity and high permeability, fluorinated graphene/poly(vinyl alcohol) aerogel (FGPA) with strong honeycomb was obtained via a facile freeze‐drying method, and the separation mechanism was investigated...

article

Computational fluid dynamics simulation for dual‐phase membrane module for CO₂ capture: Effect of membrane thickness, temperature and CO₂ feed concentration

Hui Ying Ngoi, Li Sze Lai, Wee Horng Tay, Peck Loo Kiew

Environmental Progress & Sustainable Energy > 41 > 3 > n/a - n/a

CO₂ capture and natural gas purification are of paramount significance in power plant applications nowadays. Dual‐phase membrane is an effective approach for the enhancement of CO₂/CH₄ separation efficiency. In this study, CO₂/CH₄ binary gas mixture separation was simulated by using hydroxide/ceramic dual‐phase (HCDP) membranes incorporated in the industrial‐scaled tubular membrane module. Computational...

article

Systematic Simulation Strategy of Plasma Methane Pyrolysis for CO₂‐Free H₂

Aliya Magazova, Simon Böddeker, Nikita Bibinov, David W. Agar

Chemie Ingenieur Technik > 94 > 5 > 690 - 700

Recently, the direct conversion of methane into hydrogen using cold plasma reactors has attracted increasing attention, since hydrogen has considerable potential as a future feedstock in the steel and chemical industries. However, the simulation of plasma pyrolysis reactors is extremely complex due to the vast temporal and spatial ranges of the variables involved and steep gradients. Previously, methane...

article

Modeling of gas–liquid flow in a rotating packed bed using an Eulerian multi‐fluid approach

Wei Zhang, Peng Xie, Yuxing Li, Jianlu Zhu

AIChE Journal > 68 > 4 > n/a - n/a

Rotating packed beds (RPBs) are ideal candidates for CO₂ removal from offshore natural gas due to their good mass transfer performance and significant volume savings. This article proposes an Eulerian multi‐fluid approach to simulate the gas–liquid flow in RPBs. Three new multiphase drag force models are constructed based on single‐phase drag force models for wire mesh packings. Based on the Eulerian...

article

A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

Hossein Mohammad Ghasemi, Neda Gilani, Reza Shirmohammadi, Marc A. Rosen

Environmental Progress & Sustainable Energy > 41 > 2 > n/a - n/a

The propane thermal cracking reactor process is investigated in an industrial furnace with an alternative wall burner arrangement. Temperature and heat distribution of the furnace is obtained by three‐dimensional computational fluid dynamics (CFD) simulation technique using Ansys Fluent software. Ten calculation domains are adopted to decrease calculation costs. Different fuel rate ratios are selected...

article

CFD investigation of pelletization effect on co‐firing coal with wheat straw

Adel Mohammed Redha, Anthony Lau, Maria Holuszko, Ali Vakil, more

The Canadian Journal of Chemical Engineering > 100 > 2 > 237 - 253

Biomass co‐firing in existing coal‐fired power plants has been proven successful and practised in many installations worldwide as a greener alternative to coal. Attempts to overcome the low efficiency of transporting raw biomass have resulted in global wood pellets market growth in the past decade. This research studies the effect of biomass densification on biomass co‐firing with coal. A three‐dimensional...

article

Performance evaluation of a downwind diffuser on vertical axis wind turbine

Xiao Hang Wang, Kok Hoe Wong, Wen Tong Chong, Jo Han Ng, more

International Journal of Energy Research > 46 > 1 > 351 - 369

Research has proven that the performance of a horizontal axis wind turbine (HAWTs) can be increased significantly by the application of a diffuser. It serves as a power augmented feature to draw higher wind flow toward the HAWT. However, research on integrating a diffuser onto vertical axis wind turbines (VAWTs) is scant, where most of the available power augmentation devices used for VAWTs are the...

article

Mixing characteristics of a bubble mixing microfluidic chip for genomic DNA extraction based on magnetophoresis: CFD simulation and experiment

Lin Sun, Muhammad K. Siddique, Lei Wang, Songjing Li

ELECTROPHORESIS > 42 > 21-22 > 2365 - 2374

Mixing a small amount of magnetic beads and regents with large volume samples evenly in microcavities of a microfluidic chip is always the key step for the application of microfluidic technology in the field of magnetophoresis analysis. This article proposes a microfluidic chip for DNA extraction by magnetophoresis, which relies on bubble rising to generate turbulence and microvortices of various...

article

On the pyrotechnic ignitors role in dust explosion testing: Comparison between 20 L and 1 m³ explosion vessels

Maria Portarapillo, Roberto Sanchirico, Almerinda Di Benedetto

Process Safety Progress > 40 > 4 > 289 - 295

Several phenomena (e.g., initial turbulence level, overdriving, underdriving, etc.) affect the measurement of dust explosion parameters in the 20 L and 1 m³ standard test vessels. Estimating the role of each phenomenon is crucial to understand the discrepancies observed over the years between the data collected using these vessels. In this work, we focus on the role of the pyrotechnic ignitors on...

article

The kinetics modeling and reactor simulation of propylene chlorination reaction process

Ming Li, Luchang Han, Xiao Luo, He'an Luo

AIChE Journal > 67 > 10 > n/a - n/a

The kinetics experiments of fast reaction process of propylene chlorination at low temperature (30–90°C) and high temperature (420–480°C) are respectively conducted, and the corresponding reaction mechanisms and kinetics models are proposed. The radical mechanism at high temperature and the molecular mechanism at low temperature are found to be most likely with the experimental results. Specifically,...

article

Effect of the rotor cage chassis on inner flow field of a turbo air classifier

Y. Yu, X. Kong, C. Ren, J. Liu, more

Materialwissenschaft und Werkstofftechnik > 52 > 7 > 772 - 780

As the connection between the center of rotor cage and the coarse powder collecting cone, rotor cage chassis of the turbo air classifier directly influences airflow movement in the classifier. In order to study the effect of rotor cage chassis on the inner flow field of a turbo air classifier, the flow fields of four rotor cage chassis structures with different opening size are simulated and compared...

article

Comparison of flow characteristics in a bench‐scale system with commercial‐scale pipelines: Use of computational fluid dynamics (CFD)

Mengyuan Fan, Woo‐Ju Kim, Dennis R. Heldman

Journal of Food Science > 86 > 7 > 3097 - 3108

Abstract The challenges for scale‐up are often encountered in cleaning operations during the interpretation of data from clean‐in‐place (CIP) research. The objective of this investigation was to design and characterize flow characteristics in a bench‐scale system in a manner that evaluates scale‐up to a commercial‐scale CIP operation. A bench‐scale temperature‐controlled vessel was designed for evaluation...

article

Modeling and analysis of a fully passive swinging sail wind turbine

Radmarz Hosseinie, Reza Roohi, Goodarz Ahmadi

Wind Energy > 24 > 7 > 653 - 671

Wind energy has been an attractive renewable energy source, and in recent decades, highly efficient horizontal axis wind turbines have been developed and successfully deployed. However, alternative designs for wind energy conversion have also been proposed. In previous studies, a novel swing sail design for wind energy harvesting was proposed and analyzed. This turbine harvests energy by pitching...

article

Continuous synthesis of 1‐ethoxy‐2,3‐difluoro‐4‐iodo‐benzene in a microreactor system and the Gaussian and computational fluid dynamics simulations

Qiang Chen, Siting Xia, Yujun Wang, Guangsheng Luo, more

AIChE Journal > 67 > 6 > n/a - n/a

A microreactor system consisting of membrane‐dispersion tube‐in‐tube microreactors and delay loops was developed for the continuous synthesis of 1‐ethoxy‐2,3‐difluoro‐4‐iodo‐benzene. Because of the high mass and heat transfer in the microreactor system, ortho‐ and halogen‐lithiation could be performed at −40 and −20°C, respectively, which are much higher than the temperature required (−70°C) for the...

article

Numerical and experimental study of a compact 100‐W‐class β‐type Stirling engine

Chin‐Hsiang Cheng, Duc‐Thuan Phung

International Journal of Energy Research > 45 > 5 > 6784 - 6799

The study aims to present a three‐dimensional CFD model for simulating the physical phenomena in a compact 100‐W β‐type Stirling engine. The thermal efficiency and the indicated power can be further computed based on numerical predictions. The effects of some influential parameters on the engine performance have been carried out through a parametric study around a chosen baseline case. In parallel,...

article

Performance comparison between H₂‐metal hydrides and CO₂‐adsorbents‐based sorption refrigeration systems

Shajiullah Naveed Syed, Vinod Kumar Sharma

International Journal of Energy Research > 45 > 5 > 7851 - 7869

In the present study, the performance of H₂‐metal hydrides‐based (HSRS) and CO₂‐adsorbent‐based refrigeration systems (CSRS) are investigated and compared. The pair of metal hydrides (MH) used for HSRS is La_0.9Ce_0.1Ni₅‐LaNi_4.7Al_0.3 whereas, for CSRS, it is Activated Carbon – Pore Expanded Mesoporous Silica (PEMS) adsorbents. The above pairs are chosen due to their suitability toward the sorption refrigeration...

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Search results

Influence of Powder Bed Characteristics on Material Quality in Additive Manufacturing

The problem of airflow around building clusters in different configurations

Mesh size effect on CFD simulation of gas-fluidized Geldart A particles

Analyzing the effect of using axial impellers in large‐scale bioreactors

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

Computational fluid dynamics simulation for dual‐phase membrane module for CO₂ capture: Effect of membrane thickness, temperature and CO₂ feed concentration

Systematic Simulation Strategy of Plasma Methane Pyrolysis for CO₂‐Free H₂

Modeling of gas–liquid flow in a rotating packed bed using an Eulerian multi‐fluid approach

A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

CFD investigation of pelletization effect on co‐firing coal with wheat straw

Performance evaluation of a downwind diffuser on vertical axis wind turbine

Mixing characteristics of a bubble mixing microfluidic chip for genomic DNA extraction based on magnetophoresis: CFD simulation and experiment

On the pyrotechnic ignitors role in dust explosion testing: Comparison between 20 L and 1 m³ explosion vessels

The kinetics modeling and reactor simulation of propylene chlorination reaction process

Effect of the rotor cage chassis on inner flow field of a turbo air classifier

Comparison of flow characteristics in a bench‐scale system with commercial‐scale pipelines: Use of computational fluid dynamics (CFD)

Modeling and analysis of a fully passive swinging sail wind turbine

Continuous synthesis of 1‐ethoxy‐2,3‐difluoro‐4‐iodo‐benzene in a microreactor system and the Gaussian and computational fluid dynamics simulations

Numerical and experimental study of a compact 100‐W‐class β‐type Stirling engine

Performance comparison between H₂‐metal hydrides and CO₂‐adsorbents‐based sorption refrigeration systems

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