Relevant bibliographies by topics / Heat and mass transfer (incl. computational fluid dynamics)

Academic literature on the topic 'Heat and mass transfer (incl. computational fluid dynamics)'

Author: Grafiati
Published: 10 December 2022
Last updated: 19 February 2023

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Journal articles on the topic "Heat and mass transfer (incl. computational fluid dynamics)"

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Rojano, Fernando, Pierre-Emmanuel Bournet, Melynda Hassouna, Paul Robin, Murat Kacira, and Christopher Y. Choi. "Modelling heat and mass transfer of a broiler house using computational fluid dynamics." Biosystems Engineering 136 (August 2015): 25–38. http://dx.doi.org/10.1016/j.biosystemseng.2015.05.004.

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Wrobel, Luiz C., Maciej K. Ginalski, Andrzej J. Nowak, Derek B. Ingham, and Anna M. Fic. "An overview of recent applications of computational modelling in neonatology." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1920 (June 13, 2010): 2817–34. http://dx.doi.org/10.1098/rsta.2010.0052.

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This paper reviews some of our recent applications of computational fluid dynamics (CFD) to model heat and mass transfer problems in neonatology and investigates the major heat and mass-transfer mechanisms taking place in medical devices, such as incubators, radiant warmers and oxygen hoods. It is shown that CFD simulations are very flexible tools that can take into account all modes of heat transfer in assisting neonatal care and improving the design of medical devices.
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Qi, Ji, Jiafeng Lv, Zhen Li, Wei Bian, Jingfeng Li, and Shuqin Liu. "A Numerical Simulation of Membrane Distillation Treatment of Mine Drainage by Computational Fluid Dynamics." Water 12, no. 12 (December 3, 2020): 3403. http://dx.doi.org/10.3390/w12123403.

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Membrane distillation (MD) is a promising technology to treat mine water. This work aims to investigate the change in mass and heat transfer in reverse osmosis mine water treatment by vacuum membrane distillation (VMD). A 3D computational fluid dynamics (CFD) model was carried out using COMSOL Multiphysics and verified by the experimental results. Then, response Surface Methodology (RSM) was used to explore the effects of various parameters on the permeate flux and heat transfer efficiency. In terms of the influence degree on the permeation flux, the vacuum pressure > feed temperature > membrane length > feed temperature membrane length, and the membrane length has a negative correlation with the membrane flux. Increasing the feed temperature can also increase the convective heat transfer at the feed side, which will affect the heat transfer efficiency. Furthermore, the feed temperature also has a critical effect on the temperature polarization phenomenon. The temperature polarization becomes more notable at high temperatures.
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Khongprom, Parinya, Supawadee Ratchasombat, Waritnan Wanchan, Panut Bumphenkiattikul, and Sunun Limtrakul. "Scaling of a catalytic cracking fluidized bed downer reactor based on computational fluid dynamics simulations." RSC Advances 10, no. 5 (2020): 2897–914. http://dx.doi.org/10.1039/c9ra10080f.

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Dixon, Anthony G., and Behnam Partopour. "Computational Fluid Dynamics for Fixed Bed Reactor Design." Annual Review of Chemical and Biomolecular Engineering 11, no. 1 (June 7, 2020): 109–30. http://dx.doi.org/10.1146/annurev-chembioeng-092319-075328.

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Flow, heat, and mass transfer in fixed beds of catalyst particles are complex phenomena and, when combined with catalytic reactions, are multiscale in both time and space; therefore, advanced computational techniques are being applied to fixed bed modeling to an ever-greater extent. The fast-growing literature on the use of computational fluid dynamics (CFD) in fixed bed design reflects the rapid development of this subfield of reactor modeling. We identify recent trends and research directions in which successful methodology has been established, for example, in computer generation of packings of complex particles, and where more work is needed, for example, in the meshing of nonsphere packings and the simulation of industrial-size packed tubes. Development of fixed bed reactor models, by either using CFD directly or obtaining insight, closures, and parameters for engineering models from simulations, will increase confidence in using these methods for design along with, or instead of, expensive pilot-scale experiments.
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Oon, C. S., A. Badarudin, S. N. Kazi, and M. Fadhli. "Simulation of Heat Transfer to Turbulent Nanofluid Flow in an Annular Passage." Advanced Materials Research 925 (April 2014): 625–29. http://dx.doi.org/10.4028/www.scientific.net/amr.925.625.

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The heat transfer in annular heat exchanger with titanium oxide of 1.0 volume % concentration as the medium of heat exchanger is considered in this study. The heat transfer simulation of the flow is performed by using Computational Fluid Dynamics package, Ansys Fluent. The heat transfer coefficients of water to titanium oxide nanofluid flowing in a horizontal counter-flow heat exchanger under turbulent flow conditions are investigated. The results show that the convective heat transfer coefficient of the nanofluid is slightly higher than that of the base fluid by several percents. The heat transfer coefficient increases with the increase of the mass flow rate of hot water and also the nanofluid.
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Sharma, Shubham, Shalab Sharma, Mandeep Singh, Parampreet Singh, Rasmeet Singh, Sthitapragyan Maharana, Nima Khalilpoor, and Alibek Issakhov. "Computational Fluid Dynamics Analysis of Flow Patterns, Pressure Drop, and Heat Transfer Coefficient in Staggered and Inline Shell-Tube Heat Exchangers." Mathematical Problems in Engineering 2021 (June 1, 2021): 1–10. http://dx.doi.org/10.1155/2021/6645128.

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In this numerical study, the heat transfer performance of shell-and-tube heat exchangers (STHXs) has been compared for two different tube arrangements. STHX having 21 and 24 tubes arranged in the inline and staggered grid has been considered for heat transfer analysis. Shell-and-tube heat exchanger with staggered grid arrangement has been observed to provide lesser thermal stratification as compared to the inline arrangement. Further, the study of variation in the mass flow rate of shell-side fluid having constant tube-side flow rate has been conducted for staggered grid structure STHX. The mass flow rate for the shell side has been varied from 0.1 kg/s to 0.5 kg/s, respectively, keeping the tube-side mass flow rate as constant at 0.25 kg/s. The influence of bulk mass-influx transfer rate on heat transfer efficiency, effectiveness, and pressure drop of shell-tube heat exchangers has been analyzed. CFD results were compared with analytical solutions, and it shows a good agreement between them. It has been observed that pressure drop is minimum for the flow rate of 0.1 kg/s, and outlet temperatures at the shell side and tube side have been predicted to be 40.94°C and 63.63°C, respectively.
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Wei, Xing, Bingbing Duan, Xuejun Zhang, Yang Zhao, Meng Yu, and Youming Zheng. "Numerical Simulation of Heat and Mass Transfer in Air-Water Direct Contact Using Computational Fluid Dynamics." Procedia Engineering 205 (2017): 2537–44. http://dx.doi.org/10.1016/j.proeng.2017.10.218.

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Chen, Long, and Binxin Wu. "Research Progress in Computational Fluid Dynamics Simulations of Membrane Distillation Processes: A Review." Membranes 11, no. 7 (July 7, 2021): 513. http://dx.doi.org/10.3390/membranes11070513.

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Membrane distillation (MD) can be used in drinking water treatment, such as seawater desalination, ultra-pure water production, chemical substances concentration, removal or recovery of volatile solutes in an aqueous solution, concentration of fruit juice or liquid food, and wastewater treatment. However, there is still much work to do to determine appropriate industrial implementation. MD processes refer to thermally driven transport of vapor through non-wetted porous hydrophobic membranes, which use the vapor pressure difference between the two sides of the membrane pores as the driving force. Recently, computational fluid dynamics (CFD) simulation has been widely used in MD process analysis, such as MD mechanism and characteristics analysis, membrane module development, preparing novel membranes, etc. A series of related research results have been achieved, including the solutions of temperature/concentration polarization and permeate flux enhancement. In this article, the research of CFD applications in MD progress is reviewed, including the applications of CFD in the mechanism and characteristics analysis of different MD structures, in the design and optimization of membrane modules, and in the preparation and characteristics analysis of novel membranes. The physical phenomena and geometric structures have been greatly simplified in most CFD simulations of MD processes, so there still is much work to do in this field in the future. A great deal of attention has been paid to the hydrodynamics and heat transfer in the channels of MD modules, as well as the optimization of these modules. However, the study of momentum transfer, heat, and mass transfer mechanisms in membrane pores is rarely involved. These projects should be combined with mass transfer, heat transfer and momentum transfer for more comprehensive and in-depth research. In most CFD simulations of MD processes, some physical phenomena, such as surface diffusion, which occur on the membrane surface and have an important guiding significance for the preparation of novel membranes to be further studied, are also ignored. As a result, although CFD simulation has been widely used in MD process modeling already, there are still some problems remaining, which should be studied in the future. It can be predicted that more complex mechanisms, such as permeable wall conditions, fouling dynamics, and multiple ionic component diffusion, will be included in the CFD modeling of MD processes. Furthermore, users’ developed routines for MD processes will also be incorporated into the existing commercial or open source CFD software packages.
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Ito, Kazuhide, Koki Mitsumune, Kazuki Kuga, Nguyen L. Phuong, Kenji Tani, and Kiao Inthavong. "Prediction of convective heat transfer coefficients for the upper respiratory tracts of rat, dog, monkey, and humans." Indoor and Built Environment 26, no. 6 (August 1, 2016): 828–40. http://dx.doi.org/10.1177/1420326x16662111.

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In vivo studies involving mammal surrogate models for toxicology studies have restrictions related to animal protection and ethics. Computer models, i.e., in silico models, have great potential to contribute towards essential understanding of heat and mass transfer phenomena in respiratory tracts in place of in vivo and in vitro studies. Here, we developed numerical upper airway models of a rat, a dog, a monkey, and two humans by using computed tomography data and then applied computational fluid dynamics analysis. Convective heat transfer coefficients were precisely analysed as a function of breathing airflow rate. Based on the computational fluid dynamics simulation results, the correlations between Nusselt ( Nu) number and the product of the Reynolds ( Re) and Prandtl ( Pr) numbers were summarized. The heat transfer efficiency (order of hc and correlation of Nu and RePr) in the upper airway of the dog seems to match those of the human models. On the other hand, the results for the rat and monkey showed clear differences compared with those of human models. The identified fundamental qualities of convective heat transfer phenomena in airways for rats, dogs, monkeys, and humans, have enabled discussions about quantitative differences of heat and mass transfer efficiency between different animals/species.
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Dissertations / Theses on the topic "Heat and mass transfer (incl. computational fluid dynamics)"

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Reichrath, Sven. "Convective heat and mass transfer in glasshouses." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391213.

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Burt, Andrew C. "A computational study of mixing in stratified liquid-liquid flows using analogy between heat and mass transfer." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1948.

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Thesis (M.S.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains x, 76 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 71-72).
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Guardo, Zabaleta Alfredo. "Computational Fluid Dynamics Studies in Heat and Mass Transfer Phenomena in Packed Bed Extraction and Reaction Equipment: Special Attention to Supercritical Fluids Technology." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6455.

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El entendimiento de los fenómenos de transferencia de calor y de masa en medios porosos implica el estudio de modelos de transporte de fluidos en la fracción vacía del medio; este hecho es de fundamental importancia en muchos sistemas de Ingeniería Química, tal como en procesos de extracción o en reactores catalíticos. Los estudios de flujo realizados hasta ahora (teóricos y experimentales) usualmente tratan al medio poroso como un medio efectivo y homogéneo, y toman como válidas las propiedades medias del fluido. Este tipo de aproximación no tiene en cuenta la complejidad del flujo a través del espacio vacío del medio poroso, reduciendo la descripción del problema a promedios macroscópicos y propiedades efectivas. Sin embargo, estos detalles de los procesos locales de flujo pueden llegar a ser factores importantes que influencien el comportamiento de un proceso físico determinado que ocurre dentro del sistema, y son cruciales para entender el mecanismo detallado de, por ejemplo, fenómenos como la dispersión de calor, la dispersión de masa o el transporte entre interfaces.

La Dinámica de Fluidos Computacional (CFD) como herramienta de modelado numérico permite obtener una visión mas aproximada y realista de los fenómenos de flujo de fluidos y los mecanismos de transferencia de calor y masa en lechos empacados, a través de la resolución de las ecuaciones de Navier - Stokes acopladas con los balances de materia y energía y con un modelo de turbulencia si es necesario. De esta forma, esta herramienta permite obtener los valores medios y/o fluctuantes de variables como la velocidad del fluido, la temperatura o la concentración de una especie en cualquier punto de la geometría del lecho empacado.

El objetivo de este proyecto es el de utilizar programas comerciales de simulación CFD para resolver el flujo de fluidos y la transferencia de calor y de masa en modelos bi/tri dimensionales de lechos empacados, desarrollando una estrategia de modelado aplicable al diseño de equipos para procesos de extracción o de reacción catalítica. Como referencia se tomaran procesos de tecnología supercrítica debido a la complejidad de los fenómenos de transporte involucrados en estas condiciones, así como a la disponibilidad de datos experimentales obtenidos previamente en nuestro grupo de investigación. Estos datos experimentales se utilizan como herramienta de validación de los modelos numéricos generados, y de las estrategias de simulación adoptadas y realizadas durante el desarrollo de este proyecto.
An understanding of the heat and mass transfer phenomena in a porous media implies the study of the fluid transport model within the void space; this fact is of fundamental importance to many chemical engineering systems such as packed bed extraction or catalytic reaction equipment. Experimental and theoretical studies of flow through such systems often treat the porous medium as an effectively homogeneous system and concentrate on the bulk properties of the flow. Such an approach neglects completely the complexities of the flow within the void space of the porous medium, reducing the description of the problem to macroscopic average or effective quantities. The details of this local flow process may, however, be the most important factor influencing the behavior of a given physical process occurring within the system, and are crucial to understanding the detailed mechanisms of, for example, heat and mass dispersion and interface transport.

Computational Fluid Dynamics as a simulation tool allows obtaining a more approached view of the fluid flow and heat and mass transfer mechanisms in fixed bed equipment, through the resolution of 3D Reynolds averaged transport equations, together with a turbulence model when needed. In this way, this tool permit to obtain mean and fluctuating flow and temperature values in any point of the bed.

The goal of this project is to use commercial available CFD codes for solving fluid flow and heat and mass transfer phenomena in two and three dimensional models of packed beds, developing a modeling strategy applicable to the design of packed bed chemical reaction and extraction equipment. Supercritical extraction and supercritical catalytic reaction processes will be taken as reference processes due to the complexity of the transport phenomena involved within this processes, and to the availability of experimental data in this field, obtained in the supercritical fluids research group of this university. The experimental data priory obtained by our research group will be used as validation data for the numerical models and strategies dopted and followed during the developing of the project.
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Srinivasan, Raghavan. "CFD Heat Transfer Simulation of the Human Upper Respiratory Tract for Oronasal Breathing Condition." Thesis, North Dakota State University, 2011. https://hdl.handle.net/10365/29310.

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In this thesis. a three dimensional heat transfer model of heated airflow through the upper human respiratory tract consisting of nasal, oral, trachea, and the first two generations of bronchi is developed using computational fluid dynamics simulation software. Various studies have been carried out in the literature investigating the heat and mass transfer characteristics in the upper human respiratory tract, and the study focuses on assessing the injury taking place in the upper human respiratory tract and identifying acute tissue damage based on level of exposure. The model considered is for the simultaneous oronasal breathing during the inspiration phase with high volumetric flow rate of 90/liters minute and a surrounding air temperature of 100 degrees centigrade. The study of the heat and mass transfer, aerosol deposition and flow characteristics in the upper human respiratory tract using computational fluid mechanics simulation requires access to a two dimensional or three dimensional model for the human respiratory tract. Depicting an exact model is a complex task since it involves the prolonged use of imaging devices on the human body. Hence a three dimensional geometric representation of the human upper respiratory tract is developed consisting of nasal cavity, oral cavity, nasopharynx, pharynx, oropharynx, trachea and first two generations of the bronchi. The respiratory tract is modeled circular in cross-section and varying diameter for various portions as identified in this study. The dimensions are referenced from the literature herein. Based on the dimensions, a simplified model representing the human upper respiratory tract is generated.This model will be useful in studying the flow characteristics and could assist in treatment of injuries to the human respiratory tract as well as help optimize drug delivery mechanism and dosages. Also a methodology is proposed to measure the characteristic dimension of the human nasal and oral cavity at the inlet/outlet points which are classified as internal measurements.
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Bhopte, Siddharth. "Study of transport processes from macroscale to microscale." Diss., Online access via UMI:, 2009.

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Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineeering and Applied Science, Department of Mechanical Engineering, 2009.
Includes bibliographical references.
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Ho, Son Hong. "Numerical modeling and simulation for analysis of convective heat and mass transfer in cryogenic liquid storage and HVAC&R applications." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002266.

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Ho, Son Hong. "Numerical simulation of thermal comfort and contaminant transport in air conditioned rooms." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000548.

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Wu, Dan. "A numerical study of periciliary liquid depth in MDCT-based human airway models." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1804.

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Periciliary liquid (PCL) is a critical component of the respiratory system for maintaining mucus clearance. As PCL homeostasis is affected by evaporation and mechanical forces, which are in turn affected by various breathing conditions, lung morphology and ventilation distribution, the complex process of PCL depth regulation in vivo is not fully understood. We propose an integrative approach to couple a thermo-fluid computational fluid dynamics (CFD) model with an epithelial cell model to study the dynamics of PCL depth using subject-specific human airway models based on multi-detector row computed-tomography (MDCT) volumetric lung images. The thermo-fluid CFD model solves three-dimensional (3D) incompressible Navier-Stokes and transport equations for temperature and water vapor concentration with a realistic energy flux based boundary condition imposed at airway wall. A corresponding one-dimensional (1D) thermo-fluid CFD model is also developed to provide necessary information to the 3D model. Both 1D and 3D models are validated with experimental measurements, and the temperature and humidity distributions in the airways are investigated. Correlations for the dimensionless parameters of Nusselt number and Sherwood number are proposed for characterizing heat and mass transfer in the airways. As one of the key applications of the thermo-fluid CFD model, the water loss rates in the both 1D and 3D airway models are studied. It is found that the secondary flows formed at the bifurcations elevate the regional heat and mass transfer during inspiration and hence the water loss rate, which can only be observed in the 3D models. Among the three human airway models studied in both 1D and 3D, little inter-subject variability is observed for the distributions of temperature and humidity. However, the inter-subject variability could be dramatic for the distribution of water loss rate, as it is greatly affected by airway diameter and regional ventilation. A method is proposed to construct an ion-channel conductance model for both normal and cystic fibrosis (CF) epithelial cells, which couples an existing fluid secretion model with an existing nucleotide and nucleoside metabolism model (collectively named epithelial cell model). The epithelial cell models for both normal and CF are capable of predicting PCL depth based on mechanical stresses and evaporation, and are validated with a wide range of experimental data. With these two models separately validated and tested, the integrated model of the thermo-fluid CFD model and epithelial cell model is applied to MDCT-based human airway models of three CF subjects and three normal subjects to study and compare PCL depth regulation under regular breathing conditions. It is found that evaporative water loss is the dominant factor in PCL homeostasis. Between three types of mechanical forces, cyclic shear stress is the primary factor that triggers ATP release and increases PCL depth. In addition, it is found that that greater diameters of the airways in the 4th-7th generations in CF subjects decrease evaporative water loss, resulting in similar PCL depth as normal subjects. Under regular breathing conditions, the average PCL depths of normal and CF is around 6 to 7 µm, with mechanical forces play a greater role in regulating CF PCL depth. Comparing to 7.68 µm normal base level (considered as optimum PCL depth), this average PCL depth is about 8 to 21% lower. This might suggest that mechanical forces alone cannot entirely balance evaporative water loss, and other mechanisms might be involved.
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(9832871), Abu Sayem. "Experimental study of electrostatic precipitator of a coal based power plant to improve performance by capturing finer particles." Thesis, 2019. https://figshare.com/articles/thesis/Experimental_study_of_electrostatic_precipitator_of_a_coal_based_power_plant_to_improve_performance_by_capturing_finer_particles/13408691.

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Electrostatic Precipitators (ESPs) are widely used to capture particulate matter from flue gas. In coal-based power stations, they are used for capturing fly ash before the flue gas is released to the environment. Coal-based power plants are still one of the major suppliers of energy because they are more reliable and have lower unit cost of power generation. Under the current environmental protection regulation controlled by the Environment Protection Agency (EPA), only the finer particles can be released to the environment. However, this is likely to change and coal-based power plants will then have to face stricter rules about permissible size limits for particulate matter (PM) discharged in flue gas, namely the particle size of PM 2.5 (micron) or less. It is therefore required that the capabilities of ESPs are enhanced so that they will be able to capture these finer particles. The main aim of the research is to investigate the micro-size particulate matter capture ability of existing ESPs and determine the operational parameter relationships to improve the collection efficiency of ESPs. In particular, this research focuses specifically on the flow phenomena of the finer fly ash particles inside the ESP model and how they are impacted by the changed geometries and varied electric fields. This involves studying the flow velocity and forces associated with the flow and the electric field and the relevant parameters affecting the dust collection and thus establishing and validating a relationship between the interaction of two phase flow and electric field to reveal the underlying physics for collecting finer particles. To achieve the aim, a laboratory scale ESP was constructed for undertaking various tests and measurements using a novel method. This method involved flow measurement in the ESP chamber using a pitot tube and a cobra tube, whilst employing different shaped baffles in the chamber, varying production of electrostatic field in the ESP model and testing its capturing capacity. This research investigated the influence of internal geometry of the ESP on the flow in the ESP chamber. Two different shaped baffles – semicircular and arrow shaped - were designed, fabricated and inserted in the ESP chamber to effect changes to the flue gas pathway to enhance collection efficiency and collection capability of submicron particles. The flow measurements and experimental results were compared and validated with the 2D ii simulation results. Results using baffles indicate that internal geometry of the ESP has an influence on collection efficiency and changing the internal shape produces swirling flow inside ESP, which, in turn, improves collection efficiency. In addition, baffles increase residence time, which allows capture of sub-micron particles. A high voltage transformer and associated electrode plates and rods were designed, constructed and fitted into the model ESP for measuring and investigating particle collection efficiency under various velocities and electric/voltage characteristics. Production of electric field in a lab model ESP of this type and its testing constitutes a novel approach as such work is not found in the public domain. The experimental results show that ESP collection efficiency is higher at high voltages and at low fly ash velocity and the collection efficiency rapidly decreases when voltage reduces. A mathematical model was developed and validated with the experimental measurements to confirm the collection efficiency. By analysing the various conditions and scenarios, an optimum operational condition within an operational range were developed and recommended for future ESP operation. By implementing a TR (Transformer–Rectifier) in different collection chambers, power consumption of the ESP can be reduced. The research also revealed new information on the particulate matter size distribution and the collection of submicron particles from flue gas of coal-fired power plants. Particle size distribution analysis was conducted using a Mastersizer and the morphology of the particles was analysed using a Scanning Electron Microscope (SEM). Size distribution analysis suggested that higher voltage and lower flue gas velocity will be more suitable to capture submicron particles. The morphology study indicated that smaller particles have a tendency to agglomerate with bigger particles. Overall, this thesis provides new knowledge about Electrostatic Precipitator operation with new geometries and under various electric field conditions at a laboratory scale, whilst achieving operational efficiency improvement and improving the capture of sub-micron particulate matter. The knowledge obtained from this research would be a good basis to operate industrial ESPs for future sustainable coal-fired power generation.
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(14042749), Shah M. E. Haque. "Performance study of the electrostatic precipitator of a coal fired power plant: Aspects of fine particulate emission control." Thesis, 2009. https://figshare.com/articles/thesis/Performance_study_of_the_electrostatic_precipitator_of_a_coal_fired_power_plant_Aspects_of_fine_particulate_emission_control/21454428.

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Particulate matter emission is one of the major air pollution problems of coal fired power plants. Fine particulates constitute a smaller fraction by weight of the total suspended particle matter in a typical particulate emission, but they are considered potentially hazardous to health because of the high probability of deposition in deeper parts of the respiratory tract. Electrostatic precipitators (ESP) are the most widely used devices that are capable of controlling particulate emission effectively from power plants and other process industries. Although the dust collection efficiency of the industrial precipitator is reported as about 99.5%, an anticipation of future stricter environmental protection agency (EPA) regulations have led the local power station seeking new technologies to achieve the new requirements at minimum cost and thus control their fine particulate emissions to a much greater degree than ever before.

This study aims to identify the options for controlling fine particle emission through improvement of the ESP performance efficiency. An ESP system consists of flow field, electrostatic field and particle dynamics. The performance of an ESP is significantly affected by its complex flow distribution arising as a result of its complex internal geometry, hence the aerodynamic characteristics of the flow inside an ESP always need considerable attention to improve the efficiency of an ESP. Therefore, a laboratory scale ESP model, geometrically similar to an industrial ESP, was designed and fabricated at the Thermodynamics Laboratory of CQUniversity, Australia to examine the flow behaviour inside the ESP. Particle size and shape morphology analyses were conducted to reveal the properties of the fly ash particles which were used for developing numerical models of the ESP.

Numerical simulations were carried out using Computational Fluid Dynamics (CFD) code FLUENT and comparisons were made with the experimental results. The ESP was modelled in two steps. Firstly, a novel 3D fluid (air) flow was modelled considering the detailed geometrical configuration inside the ESP. A novel boundary condition was applied at the inlet boundary of this model to overcome all previous assumptions on uniform velocity at the inlet boundary. Numerically predicted velocity profiles inside the ESP model are compared with the measured data obtained from the laboratory experiment. The model with a novel boundary condition predicted the flow distribution more accurately. In the second step, as the complete ESP system consists of an electric field and a particle phase in addition to the fluid flow field, a two dimensional ESP model was developed. The electrostatic force was applied to the flow equations using User Defined Functions (UDF). A discrete phase model was incorporated with this two dimensional model to study the effect of particle size, electric field and flue gas flow on the collection efficiency of particles inside the ESP. The simulated results revealed that the collection efficiency cannot be improved by the increased electric force only unless the flow velocity is optimized.

The CFD model was successfully applied to a prototype ESP at the power plant and used to recommend options for improving the efficiency of the ESP. The aerodynamic behaviour of the flow was improved by geometrical modifications in the existing 3D numerical model. In particular, the simulation was performed to improve and optimize the flow in order to achieve uniform flow and to increase particle collection inside the ESP. The particles injected in the improved flow condition were collected with higher efficiency after increasing the electrostatic force inside the 2D model. The approach adopted in this study to optimize flow and electrostatic field properties is a novel approach for improving the performance of an electrostatic precipitator.

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Books on the topic "Heat and mass transfer (incl. computational fluid dynamics)"

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International Symposium on Computational Fluid Dynamics and Heat/Mass Transfer Modeling in the Metallugical Industry (1996 Montreal, Quebec). Computational fluid dynamics and heat/mass transfer modeling in the metallurgical industry: Proceedings of the international symposium. Montreal, Qué: Metallurgical Society of the Canadian Institute of Mining Metallurgy and Petroleum, 1996.

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Yarin, L. P. The Pi-Theorem: Applications to Fluid Mechanics and Heat and Mass Transfer. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Luo, Lingai. Heat and Mass Transfer Intensification and Shape Optimization: A Multi-scale Approach. London: Springer London, 2013.

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Rigby, David L. Prediction of heat and mass transfer in a rotating ribbed coolant passage with a 180 degree turn. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1999.

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Guo, Weidong. The Application of the Chebyshev-Spectral Method in Transport Phenomena. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Majumdar, Pradip. Computational Fluid Dynamics and Heat Transfer, Second Edition. Taylor & Francis Group, 2021.

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Majumdar, Pradip. Computational Fluid Dynamics and Heat Transfer, Second Edition. Taylor & Francis Group, 2019.

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Computational Fluid Dynamics and Heat Transfer, Second Edition. Taylor & Francis Group, 2019.

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Majumdar, Pradip. Computational Fluid Dynamics and Heat Transfer, Second Edition. Taylor & Francis Group, 2021.

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Majumdar, Pradip. Computational Fluid Dynamics and Heat Transfer, Second Edition. Taylor & Francis Group, 2021.

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Book chapters on the topic "Heat and mass transfer (incl. computational fluid dynamics)"

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Yu, Kuo-Tsong, and Xigang Yuan. "Related Field (I): Fundamentals of Computational Fluid Dynamics." In Heat and Mass Transfer, 1–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-53911-4_1.

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Chaurasia, Ashish S. "Heat and Mass Transfer Processes in 2D and 3D." In Computational Fluid Dynamics and Comsol Multiphysics, 199–256. Boca Raton: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003180500-5.

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"Calculations of Flows with Heat and Mass Transfer." In Computational Thermo-Fluid Dynamics, 85–113. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527636075.ch4.

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Abou-Ellail, Mohsen M. M., Yuan Li, and Timothy W. Tong. "2 Higher-order numerical schemes for heat, mass, and momentum transfer in fluid flow." In Computational Fluid Dynamics and Heat Transfer, 19–60. WIT Press, 2010. http://dx.doi.org/10.2495/978-1-84564-144-3/02.

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"CFD Modeling of Simultaneous Heat and Mass Transfer in Beef Chilling." In Computational Fluid Dynamics in Food Processing, 213–40. CRC Press, 2007. http://dx.doi.org/10.1201/9781420009217-13.

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Javier Trujillo, Francisco, and Q. Tuan Pham. "CFD Modeling of Simultaneous Heat and Mass Transfer in Beef Chilling." In Computational Fluid Dynamics in Food Processing, 195–221. CRC Press, 2007. http://dx.doi.org/10.1201/9781420009217.ch8.

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O. Quadri, Mubashir, Matthew N. Ottah, Olayinka Omowunmi Adewumi, and Ayowole A. Oyediran. "Scaling Investigation of Low Prandtl Number Flow and Double Diffusive Heat and Mass Transfer over Inclined Walls." In Computational Fluid Dynamics Simulations. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.90896.

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Peralta, Juan Manuel, and Susana E. Zorrilla. "CFD Modeling of Heat and Mass Transfer in a Hydrofluidization System During Food Chilling and Freezing." In Computational Fluid Dynamics in Food Processing, 87–104. CRC Press, 2018. http://dx.doi.org/10.1201/9781351263481-4.

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Yaïci, Wahiba, and Evgueniy Entchev. "Unsteady CFD with Heat and Mass Transfer Simulation of Solar Adsorption Cooling System for Optimal Design and Performance." In Advanced Computational Fluid Dynamics for Emerging Engineering Processes - Eulerian vs. Lagrangian. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.81144.

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Castellano, Leonardo, Nicoletta Sala, Angelo Rolla, and Walter Ambrosetti. "The Residence Time of the Water in Lake MAGGIORE. Through an Eulerian-Lagrangian Approach." In Complexity Science, Living Systems, and Reflexing Interfaces, 218–34. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2077-3.ch011.

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This chapter describes a study designed to evaluate the spectrum of the residence time of the water at different depths of a deep lake, and to examine the mechanisms governing the seasonal cycle of thermal stratification and destratification, with the ultimate aim of assessing the actual exchange time of the lake water. The study was performed on Lake Maggiore (depth 370m) using a multidimensional mathematical model and computer codes for the heat and mass transfer in very large natural water bodies. A 3D Eulerian time-dependent CFD (Computational Fluid Dynamics) code was applied under real conditions, taking into account the effects of the monthly mean values of the mass flow rates and temperatures of all the tributaries, mass flow rate of the Ticino effluent and meteorological, hydrological, and limnological parameters available from the rich data-base of the CNR-ISE (Pallanza). The velocity distributions from these simulations were used to compute the paths of a large number of massless markers with different initial positions and evaluate their residence times in the lake.
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Conference papers on the topic "Heat and mass transfer (incl. computational fluid dynamics)"

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Pathak, Kedar, and Kendrick Aung. "Numerical Simulations of Dynamics of a Tunnel Fire." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56154.

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Study of fire in a tunnel is very important for fire safety. Increasing concerns over terrorism put a lot of focus on the fires in tunnels as they are used extensively in mass transit systems all over the world. A lot of experiments have been carried out to study the fire hazard, smoke movement, and the effects of ventilation on fire behavior. In this paper, dynamics of a ventilated tunnel fire have been simulated using Computational Fluid Dynamics (CFD) Software, CFX 5.6, from Ansys Inc. Simulations considers different models of turbulence and radiation heat transfer. Combustion of methane is modeled using the chemical reaction schemes available in the CFX software. Two turbulent models, k–ε and Shear Stress Transport, are considered. Radiant heat exchange between the species is modeled using P1 model available in CFX 5.6. The results of the simulation have highlighted the effects of ventilation on the fire and movement of harmful gases such as carbon monoxide and nitrogen oxide. Comparison of simulated temperature fields and flame shape with the experimental data has shown good agreement.
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Hawkes, Grant L., James E. O’Brien, and Greg G. Tao. "3D CFD Electrochemical and Heat Transfer Model of an Internally Manifolded Solid Oxide Electrolysis Cell." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62582.

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A three-dimensional computational fluid dynamics (CFD) and electrochemical model has been created to model high-temperature electrolysis cell performance and steam electrolysis in an internally manifolded planar solid oxide electrolysis cell (SOEC) stack. This design is being evaluated experimentally at the Idaho National Laboratory (INL) for hydrogen production from nuclear power and process heat. Mass, momentum, energy, and species conservation are numerically solved by means of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, operating potential, steam-electrode gas composition, oxygen-electrode gas composition, current density and hydrogen production over a range of stack operating conditions. Results will be presented for a five-cell stack configuration that simulates the geometry of five-cell stack tests performed at the INL and at Materials and System Research, Inc. (MSRI). Results will also be presented for a single cell that simulates conditions in the middle of a large stack. Flow enters the stack from the bottom, distributes through the inlet plenum, flows across the cells, gathers in the outlet plenum and flows downward making an upside-down “U” shaped flow pattern. Flow and concentration variations exist downstream of the inlet holes. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition. Results are discussed for using this design in the electrolysis mode. Discussion of thermal neutral voltage, enthalpy of reaction, hydrogen production, cell thermal efficiency, cell electrical efficiency, and Gibbs free energy are discussed and reported herein.
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McConnell, Jonathan, Tuhin Das, Andres Caesar, James Hoy, and Prithvi Veeravalli. "Multi-Physics Dynamic Modeling and Transient Simulation of a Multi-Stage Heat Recovery Steam Generator (HRSG)." In ASME 2019 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/dscc2019-9084.

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Abstract This paper presents a dynamic model of a three-pressure-stage Heat Recovery Steam Generator (HRSG) system. It is developed on the Siemens T3000 plant monitoring environment. The multi-physics mathematical model captures essential physical phenomena of the HRSG system such as thermodynamics, heat transfer, phase change, fluid dynamics, etc. as well as their couplings. Fast simulation of the dynamic model is achieved and real-time execution is feasible. Aside from heat exchange elements such as economizers and superheaters, the critical components of the model are the high, intermediate, and low pressure boilers. Here, phase transitions and widely different operating pressures pose unique computational challenges and demand accurate modeling of mass and energy balance during unsteady conditions. A two-mode dynamics has been implemented in modeling the boilers. The model switches between these modes during transients. Through collaboration with Siemens Energy Inc., the model’s transient behavior and steady values have been validated with selected transient startup-data from a real HRSG.
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Hawkes, Grant, and Russell Jones. "CFD Model of a Planar Solid Oxide Electrolysis Cell: Base Case and Variations." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32310.

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A three-dimensional computational fluid dynamics (CFD) model has been created to model high-temperature steam electrolysis in a planar solid oxide electrolysis cell (SOEC). The model represents a single cell, as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack that was fabricated by Ceramatec, Inc. and tested at the Idaho National Laboratory. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) module adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, activation over-potential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Mean model results are shown to compare favorably with experimental results obtained from an actual ten-cell stack tested at INL. Mean per-cell area-specific-resistance (ASR) values decrease with increasing current density, consistent with experimental data. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Effects of variations in operating temperature, gas flow rate, cathode and anode exchange current density, and contact resistance from the base case are presented. Discussion of thermal neutral voltage, enthalpy of reaction, hydrogen production, cell thermal efficiency, cell electrical efficiency, and Gibbs free energy are discussed and reported herein.
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Hawkes, Grant, Jim O’Brien, Carl Stoots, Steve Herring, and Mehrdad Shahnam. "Thermal and Electrochemical Three Dimensional CFD Model of a Planar Solid Oxide Electrolysis Cell." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72565.

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A three-dimensional computational fluid dynamics (CFD) model has been created to model high-temperature steam electrolysis in a planar solid oxide electrolysis cell (SOEC). The model represents a single cell, as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack that was fabricated by Ceramatec, Inc. and tested at the Idaho National Laboratory. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Mean model results are shown to compare favorably with experimental results obtained from an actual ten-cell stack tested at INL.
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Winter, S. L., C. G. Bailey, and D. D. Apsley. "Computational Fluid Dynamics Modelling of Compartment Fires." In Turbulence, Heat and Mass Transfer 5. Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer. New York: Begellhouse, 2006. http://dx.doi.org/10.1615/ichmt.2006.turbulheatmasstransf.1310.

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Abeykoon, Chamil. "Modelling of Heat Exchangers with Computational Fluid Dynamics." In 8th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'21). Avestia Publishing, 2021. http://dx.doi.org/10.11159/ffhmt21.127.

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Jamaleddine, Tarek J., and Ramsey Bunama. "Simulation of Flow Field Past Symmetrical Aerofoil Baffles Using Computational Fluid Dynamics Method." In International Conference of Fluid Flow, Heat and Mass Transfer. Avestia Publishing, 2017. http://dx.doi.org/10.11159/ffhmt17.120.

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Wu, B., G. H. Chen, D. Fu, John Moreland, Chenn Q. Zhou, Liejin Guo, D. D. Joseph, Y. Matsumoto, Y. Sommerfeld, and Yueshe Wang. "Integration of Virtual Reality with Computational Fluid Dynamics for Process Optimization." In THE 6TH INTERNATIONAL SYMPOSIUM ON MULTIPHASE FLOW, HEAT MASS TRANSFER AND ENERGY CONVERSION. AIP, 2010. http://dx.doi.org/10.1063/1.3366338.

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Lee, Sungsu, Kyung-Soo Yang, and Jong-Yeon Hwang. "An Aid to Learn Computational Fluid Dynamics: Immersed-Boundary-Based Simulation of 2D Flow." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56281.

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Development of geometry-independent computational method and educational codes for simulation of 2D flows around objects of complex geometry is presented. Referred as immersed boundary method, it introduces virtual forcing to governing equations to represent the effect of physical boundaries. The present method is based on a finite-volume approach on a staggered grid with a fractional-step method to solve Navier-Stokes equation and continuity equation. Both momentum and mass forcings are introduced on and inside the object to satisfy no-slip condition and mass conservation. Since Cartesian grid lines in general do not coincide with the immersed boundaries, several interpolation schemes are employed. Several examples are simulated using the method presented in this study and the results agree well with other results. Both user-friendly preprocessor with GUI and FORTRAN-based solver are open to the public for educational purposes.
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