Let's Get Physical! Optimizing Nashville CWWTP Primary Influent Baffles with CFD and Physical Modeling

2020 ◽  
Author(s):  
Eric Mayhaus ◽  
◽  
John Barnett ◽  
Keyword(s):  
Physical Modeling ◽  
Construction Projects ◽  
Real Life ◽  
Scale Model ◽  
Cfd Modeling ◽  
Start Up ◽  
Plant Operations ◽  
Operations And Maintenance ◽  
Computational Fluid Dynamics Cfd ◽  
First Time

For most construction projects in the water/wastewater field, the first time the design can be validated and shown to actually work is after construction and start-up. It’s not too often that there is an opportunity to prove modeling with real-world results BEFORE improvements are constructed. What better way to see design translate from paper to real-life performance than to build a scale model and run multiple flow trials? This paper presents a case study for the design of primary settling tanks (PST) influent baffles at the Nashville Central WWTP (CWWTP by utilizing hydraulic computational fluid dynamics (CFD) modeling and validating results with physical modeling. Physical model results helped gain the plant operations and maintenance (O&M) trust in validating the design and provide the best solution for improvements.

scholarly journals Managing Fast-Track Construction Project in Qatar: Challenges and Opportunities

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 640
Author(s):  
Temitope Egbelakin ◽  
Olabode Emmanuel Ogunmakinde ◽  
Billie Teshich ◽  
Temitope Omotayo
Keyword(s):  
Construction Projects ◽  
Fast Track ◽  
United Arab Emirate ◽  
Real Life ◽  
Project Managers ◽  
Accurate Information ◽  
Change Orders ◽  
Life Project ◽  
Challenges And Opportunities ◽  
Operations And Maintenance

Fast-track construction projects are becoming increasingly prevalent in the construction industry, particularly where completion time is essential. A high adoption rate in some of the United Arab Emirate countries and the lack of a conceptual understanding of the challenges inherent in such may jeopardize the future sustainability of the construction sector. To make an informed decision about adopting a fast-track construction method, it is necessary to first identify the opportunities and challenges associated with it. Therefore, this study examines the critical challenges impeding the performance of Qatar’s fast-track construction projects. The research findings were analysed and triangulated using a real-life project as a case study and several data sources. The results of the research identified four critical categories of barriers: design and coordination-related, scope or change orders-related, material and equipment-related, and contractual-related barriers. In addition, strategies such as accurate information, constructability assessment, early involvement of operations and maintenance personnel, and the use of an effective change control system were identified for addressing the identified challenges. The findings are beneficial to professionals who are currently operating or planning to undertake construction projects in Qatar or other United Arab Emirate countries. This study recommends that project managers be more attentive to key barriers in order to improve the performance of fast-track projects and to meet clients’ objectives.

Recovery boiler sootblowers: History and technological advances

TAPPI Journal ◽  
2015 ◽  
Vol 14 (1) ◽  
pp. 51-60
Author(s):  
HONGHI TRAN ◽  
DANNY TANDRA
Keyword(s):  
Cfd Modeling ◽  
Computing Systems ◽  
The Past ◽  
Technological Advances ◽  
Recovery Boilers ◽  
Computational Fluid Dynamics Cfd ◽  
Recovery Boiler ◽  
Steam Parameters ◽  
Insight Into ◽  
Deposit Removal

Sootblowing technology used in recovery boilers originated from that used in coal-fired boilers. It started with manual cleaning with hand lancing and hand blowing, and evolved slowly into online sootblowing using retractable sootblowers. Since 1991, intensive research and development has focused on sootblowing jet fundamentals and deposit removal in recovery boilers. The results have provided much insight into sootblower jet hydrodynamics, how a sootblower jet interacts with tubes and deposits, and factors influencing its deposit removal efficiency, and have led to two important innovations: fully-expanded sootblower nozzles that are used in virtually all recovery boilers today, and the low pressure sootblowing technology that has been implemented in several new recovery boilers. The availability of powerful computing systems, superfast microprocessors and data acquisition systems, and versatile computational fluid dynamics (CFD) modeling capability in the past two decades has also contributed greatly to the advancement of sootblowing technology. High quality infrared inspection cameras have enabled mills to inspect the deposit buildup conditions in the boiler during operation, and helped identify problems with sootblower lance swinging and superheater platens and boiler bank tube vibrations. As the recovery boiler firing capacity and steam parameters have increased markedly in recent years, sootblowers have become larger and longer, and this can present a challenge in terms of both sootblower design and operation.

The New Business Road Test: What Entrepreneurs and Investors Should Do Before Launching a Lean Startup, by John Mullins

2019 ◽  
Vol 1 (1) ◽  
pp. 89-92
Author(s):  
José Luis Albites Sanabria
Keyword(s):  
Road Test ◽  
Start Up ◽  
Plan B ◽  
Entrepreneurial Team ◽  
New Business ◽  
First Time ◽  
Lean Startup ◽  
Thought Leaders

John Mullins is a researcher, teacher and one of the world’s foremost thought leaders in entrepreneurship. Over the years, John has been hailed as an inspiration for entrepreneurs who have employed the models outlined in books such as Getting to Plan B or The Customer-Funded Business, in order to transform their ideas into global startup companies. Now in its 5th edition, The New Business Road Test guides the reader through the complex yet gripping process of testing a business idea. How can you be completely sure that your list of start-up ideas is good or bad? How much time or money should you invest in each of these ideas? And, for first-time entrepreneurs, should you embark upon a start-up just because you love your idea? Should you leave a stable job and focus entirely on what feels to you like a good business idea? Mullins’ book offers thoughtful readers guidance on the thorny issues associated with entrepreneurship that you yourself may be facing even as you read this introduction. In order to fully understand the theories behind the tools and advice for testing your idea, we must start by understanding Mullins’ vision of the entrepreneurial world. The book begins by defining three elements crucial to the success of a business: the market, the industry, and the entrepreneurial team.

scholarly journals Computational Investigation of Inclusion Removal in the Steel-Refining Ladle Process

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1048
Author(s):  
Xipeng Guo ◽  
Joel Godinez ◽  
Nicholas J. Walla ◽  
Armin K. Silaen ◽  
Helmut Oltmann ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Porous Plug ◽  
Cfd Modeling ◽  
Balance Model ◽  
Computational Investigation ◽  
Inclusion Removal ◽  
Inclusion Interaction ◽  
Computational Fluid Dynamics Cfd ◽  
Steel Refining ◽  
Transient Multiphase Flow

In a steel-refining ladle, the properties of manufactured steel can be notably degraded due to the presence of excessive inclusions. Stirring via gas injection through a porous plug is often used as part of the steel-refining process to reduce these inclusions. In this paper, 3D computational fluid dynamics (CFD) modeling is used to analyze transient multiphase flow and inclusion removal in a gas-stirred ladle. The effects of gas stirring with bubble-inclusion interaction are analyzed using the Euler–Euler approach for multiphase flow modeling, while the effects of inclusions aggregation and removal are modeled via a population balance model (PBM).

Fueling Spin-offs: Case Studies of University-based Technology Start-up Funding

2021 ◽  
Vol 22 (1) ◽  
pp. 29-40
Author(s):  
Julie Lenzer ◽  
Piotr Kulczakowicz
Keyword(s):  
Product Development ◽  
New Technologies ◽  
Early Stage ◽  
New Products ◽  
Academic Research ◽  
Real Life ◽  
Private Investment ◽  
Building Relationships ◽  
Start Up ◽  
Single Path

The new technologies born from academic research can be very promising, yet they are often very early stage. University spin-off companies are uniquely positioned to tackle the risks associated with new technologies emerging from academia by developing proofs of concept, functioning prototypes, and new products. While these enterprises start from a solid research and development foundation, they face their own unique set of challenges—they are strongly anchored in the scientific and technological expertise that is typically backed by intellectual property but often lack the business experience needed to develop and market products demanded by customers. University spin-offs have access to substantial non-dilutive funding that can be utilized for advancing product development. While the relentless pursuit of these funds builds a company's credibility and improves its position for negotiating future private investment, university spin-offs would greatly benefit from an early focus on complementing their technology teams with their business teams. These new enterprises should consider pursuing private investment in parallel to utilizing sources of non-dilutive funding. Timing of private investment is extremely important to maximize the value of the opportunity, and, therefore, building relationships with investors early on and getting ready for executing an investment round can greatly increase odds for success. While there is no single path to formulate, pursue, and adapt successful financing strategies, lessons can be learned from real-life cases of university spin-offs that continue their journeys towards ultimate success.

Modeling Approaches to Accurately Predict Minimum Fluidization Characteristics of Gas-Solid Fluidized Beds

2012 ◽  
Author(s):  
Santhip Krishnan Kanholy ◽  
Francine Battaglia
Keyword(s):  
Binary Mixtures ◽  
Fluidized Beds ◽  
Solid Phase ◽  
Cfd Modeling ◽  
Particle Interactions ◽  
Dead Zones ◽  
Modeling Approaches ◽  
Minimum Fluidization ◽  
Computational Fluid Dynamics Cfd ◽  
Eulerian Modeling

The hydrodynamics of fluidized beds involving gas and particle interactions are very complex and must be carefully considered when using computational fluid dynamics (CFD). Modeling particle interactions are even more challenging for binary mixtures composed of varying particle characteristics such as diameter or density. One issue is the presence of dead-zones, regions of particles that do not fluidize and accumulate at the bottom, affecting uniform fluidization. In Eulerian-Eulerian modeling, the solid phase is assumed to behave like a fluid and the presence of dead zones are not typically captured in a simulation. Instead, the entire bed mass present in an experiment is modeled, which assumes full fluidization. The paper will present modeling approaches that account for only the fluidizing mass by adjusting the initial mass present in the bed using pressure drop and minimum fluidization velocity from experiments. In order to demonstrate the fidelity of the new modeling approach, different bed materials are examined. Binary mixture models are also validated for two types of mixtures consisting of glass-ceramic and ceramic-ceramic compositions. It will be shown that adjusting the mass in the modeling of fluidized beds best represents the measured quantities of an experiment for both single-phase and binary mixtures.

scholarly journals THE COMBUSTION ENGINE INTAKE MANIFOLD CFD MODELING DEPENDING ON THE AIRBOX CONFIGURATION

2021 ◽  
Vol 2021 (6) ◽  
pp. 5421-5425
Author(s):  
MICHAL RICHTAR ◽  
◽  
PETRA MUCKOVA ◽  
JAN FAMFULIK ◽  
JAKUB SMIRAUS ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Combustion Chamber ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Stationary Flow ◽  
Cfd Modeling ◽  
Intake Manifold ◽  
Combustion Engines ◽  
Computational Fluid Dynamics Cfd

The aim of the article is to present the possibilities of application of computational fluid dynamics (CFD) to modelling of air flow in combustion engine intake manifold depending on airbox configuration. The non-stationary flow occurs in internal combustion engines. This is a specific type of flow characterized by the fact that the variables depend not only on the position but also on the time. The intake manifold dimension and geometry strongly effects intake air amount. The basic target goal is to investigate how the intake trumpet position in the airbox impacts the filling of the combustion chamber. Furthermore, the effect of different distances between the trumpet neck and the airbox wall in this paper will be compared.

Repetitive Project Modelling With Penalty and Incentive

2018 ◽  
Vol 9 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Mohammed Shurrab ◽  
Ghaleb Y. Abbasi ◽  
Osama Eljamal ◽  
Jalal T. Tanatrah
Keyword(s):  
Construction Projects ◽  
Real Life ◽  
Analytical Techniques ◽  
Suggested Model ◽  
The Real ◽  
Analytical Technique ◽  
Numerical Example ◽  
Graphical Technique ◽  
Project Model ◽  
Repetitive Activities

Repetitive construction activities have the same activities which are performed repeatedly. Repetitive projects include: pipelines, highways, and multi-story buildings. Repetitive projects have been modelled widely using the traditional network techniques although, they have some disadvantages. Furthermore, different approached have been developed for repetitive activities including the graphical and analytical techniques. The objective of this research is to add new enhancements on an approach called Repetitive Project Model (RPM) which is related to the repetitive construction projects. The enhancements incorporating the incentives and penalties within the RPM. This model incorporates a network technique, a graphical technique, and an analytical technique. A numerical example was demonstrated in this research paper to aid on using the suggested model in the real-life application.

Sign in / Sign up

Export Citation Format

Share Document