Modeling and Simulation of Sedimentation in Glycol Heat Exchanger by Computational Fluid Dynamics (CFD)

Abstract A brief narration on significant accomplishments in computational fluid dynamics (CFD) for basic research and aerospace application is attempted to highlight the outstanding achievements by scientists and engineers of this discipline. To traverse such a vast domain, numerous and excellent contributions to CFD will be unintentionally overlooked by the author’s limited exposure. Nevertheless it is an ardent hope that the present abridged literature review will aid to reaffirm excellence in research and to identify knowledge shortfalls both in aerodynamics and its modeling and simulation capability. The future modeling and simulation technology needs, as well as potential and fertile research areas, are humbly put forth for consideration.

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Modeling and Simulation of Reaction Environment in Photoredox Catalysis: A Critical Review

Frontiers in Chemical Engineering ◽

10.3389/fceng.2021.788653 ◽

2022 ◽

Vol 3 ◽

Author(s):

Gabriela Xavier de Oliveira ◽

Jéssica Oliveira de Brito Lira ◽

Humberto Gracher Riella ◽

Cíntia Soares ◽

Natan Padoin

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Modeling And Simulation ◽

Continuous Flow ◽

Reaction Medium ◽

Added Value ◽

Side Reactions ◽

Photoredox Catalysis ◽

Comprehensive Overview ◽

Computational Fluid Dynamics Cfd

From the pharmaceutical industry’s point of view, photoredox catalysis has emerged as a powerful tool in the field of the synthesis of added-value compounds. With this method, it is possible to excite the catalyst by the action of light, allowing electron transfer processes to occur and, consequently, oxidation and reduction reactions. Thus, in association with photoredox catalysis, microreactor technology and continuous flow chemistry also play an important role in the development of organic synthesis processes, as this technology offers high yields, high selectivity and reduced side reactions. However, there is a lack of a more detailed understanding of the photoredox catalysis process, and computational tools based on computational fluid dynamics (CFD) can be used to deal with this and boost to reach higher levels of accuracy to continue innovating in this area. In this review, a comprehensive overview of the fundamentals of photoredox catalysis is provided, including the application of this technology for the synthesis of added-value chemicals in microreactors. Moreover, the advantages of the continuous flow system in comparison with batch systems are pointed out. It was also demonstrated how modeling and simulation using computational fluid dynamics (CFD) can be critical for the design and optimization of microreactors applied to photoredox catalysis, so as to better understand the reagent interactions and the influence of light in the reaction medium. Finally, a discussion about the future prospects of photoredox reactions considering the complexity of the process is presented.

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Computational Fluid Dynamics (CFD) simulation to analyze the performance of tube-in-tube helically coiled of a heat exchanger

Scientific Research and Essays ◽

10.5897/sre2014.5843 ◽

2014 ◽

Vol 9 (7) ◽

pp. 181-188 ◽

Cited By ~ 1

Author(s):

A. Chaves C. ◽

R. F. de Castro D. ◽

Q. Lamas W. ◽

R. Camargo J. ◽

J. Grandinetti F.

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Heat Exchanger ◽

Cfd Simulation ◽

Computational Fluid Dynamics Cfd

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Odor Problems in Toilets with Reduced Ventilation Frequencies

E3S Web of Conferences ◽

10.1051/e3sconf/201911102025 ◽

2019 ◽

Vol 111 ◽

pp. 02025

Author(s):

Madoka Kimura ◽

Takashi Akimoto ◽

Nobuhiro Hirasuga ◽

Yu Sakamoto ◽

Sakurako Yamakita ◽

...

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Heat Exchanger ◽

Questionnaire Survey ◽

Ammonia Concentration ◽

Degree Of Contamination ◽

Ventilation Frequency ◽

Computational Fluid Dynamics Cfd ◽

Cfd Analyses ◽

The Relationship

Japan’s toilets are generally ventilated 15 times per hour. Despite the development in toilets, the ventilation frequency in toilets has not been changed in recent times. Therefore, there is a possibility that toilets are being excessively ventilated. Reducing the ventilation frequency increases the return air to the heat exchanger and improves the efficiency of the heat exchanger. For an optimal ventilation frequency, we introduce a system that could control the exhaust air using sensors. The primary issue is the odor caused by reducing the ventilation frequency. In this study, we aim to eliminate the odor as quickly as possible by providing an exhaust port at the bottom of the wall (hereinafter referred as “baseboard deodorization”). First, we examined the relationship among the odor sensor, human’s olfactory odor identification and ventilation volumes with the toilet in operation to verify the usefulness of the sensors. Next, the air environment was analyzed using computational fluid dynamics (CFD). The results of the measurements and questionnaire survey indicate a correlation between the degree of contamination in the air and the odor intensity. The CFD analyses demonstrated, even after the frequency of ventilation reduced to 5 times per hour, that the ammonia concentration obtained was equivalent to 15 times per hour. To solve the odor problem due to the ventilation reduction, it is important to evacuate air immediately after the odor is generated. Among others, it was observed that a baseboard deodorization system contributes significantly to the reduction in ammonia concentration.

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