Thermal/fluid characteristics of the inline stacked plain‐weave screen as solar‐powered Stirling engine heat regenerators

Mortazavi, Hamed; Beni, Hamidreza Mortazavy; Islam, Mohammad S.

doi:10.1049/rpg2.12405

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…This was because the head location affects the airway form. In general, a CFD analysis is an efficient and powerful tool for modeling and investigating other domains in different critical locations [26][27][28][29], but has a few limitations [30]. Essential indexes of the respiratory system such as age [31,32], aerosol transport [33,34], lung cancer [35], drug delivery [36], air pollution emissions [37], stenosis airways [38], and in realistic lung airways [39] have been studied.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the Upper Respiratory Tract of a Male Smoker with Laryngeal Cancer by Inhaling Air Associated with Various Physical Activity Levels

et al. 2022

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Smokers are at a higher risk of laryngeal cancer, which is a type of head and neck cancer in which cancer cells proliferate and can metastasize to other tissues after a tumor has formed. Cigarette smoke greatly reduces the inhaled air quality and can also lead to laryngeal cancer. In this study, the upper airway of a 70-year-old smoker with laryngeal cancer was reconstructed by taking a CT scan using Mimics software. To solve the governing equations, computational fluid dynamics (CFD) with a pressure base approach was used with the help of Ansys 2021 R1 software. As a result, the maximum turbulence intensity occurred in the larynx. At 13 L/min, 55 L/min, and 100 L/min, the maximum turbulence intensity was 1.1, 3.5, and 6.1, respectively. The turbulence intensity in the respiratory system is crucial because it demonstrates the ability to transfer energy. The maximum wall shear stress (WSS) also occurred in the larynx. At 13 L/min, 55 L/min, and 100 L/min, the maximum WSS was 0.62 Pa, 5.4 Pa, and 12.4 Pa, respectively. The WSS index cannot be calculated in vivo and should be calculated in vitro. Excessive WSS in the epiglottis is inappropriate and can lead to an airway obstruction. Furthermore, real mathematical modeling outcomes provide an approach for future prevention, treatment, and management planning by forecasting the zones prone to an acceleration of disease progression. In this regard, accurate computational modeling leads to pre-visualization in surgical planning to define the best reformative techniques to determine the most probable patient condition consequences.

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Section: Discussionmentioning

confidence: 99%

Investigation of the Upper Respiratory Tract of a Male Smoker with Laryngeal Cancer by Inhaling Air Associated with Various Physical Activity Levels

et al. 2022

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“…25 In the Computational Fluid Dynamics (CFD) domain, wall behaviour is considered rigid in all types of mathematical modelling. [26][27][28][29] Therefore, the application of CFD methods to represent human body organs with viscoelastic behaviour creates an aura of ambiguity. The Fluid-Structure Interaction (FSI) method has been used to solve this problem, such that wall properties are considered in the mathematical model of the organ.…”

Section: Introductionmentioning

confidence: 99%

Relaxation and creep response of the alveolar lung to diagnosis and treatments for respiratory and lung disorders

2022

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Background The lung Extracellular Matrix (ECM) contains a considerable part of the parenchymal cells. It contains three essential components: elastin and collagen within a proteoglycan (PG) viscoelastic network. Elastin provides the lung’s elasticity property, a necessity for normal breathing, while collagen prepares structural support and strength, and PGs give stability and cushioning within tissue loading. Bacterial and viral respiratory diseases are dependent on changes in the ECM ingredients, which result in an alteration of the lung tissue strength. Purpose In the present study, this variation was investigated by changing the volume ratio of the ECM ingredients in the viscoelastic model. Purpose As a result, the relaxation curves continuously declined by reducing the volume ratios of elastin, collagen, and PGs; subsequently, the lung stiffness decreased. Also, the Standard Linear Solid (SLS) model-based results demonstrated excellent accordance with empirical data with only minor deviations. The resting relaxation modulus and the creep modulus for the ECM tissue were 51 kPa and approximately 0.02 kPa, respectively, and the maximum total modulus of elasticity reached 121 kPa. Conclusions Moreover, this model demonstrates individual alveolar mechanical behaviours and adds another pathway to the generalized Kelvin-Voigt and Maxwell models in predicting the progress of lung diseases.

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“…Computational fluid dynamics, a numerical calculation method, combines the finite volume method with the principles of heat transfer to perform accurate HST calculations. Scholars widely recognise CFD's accuracy in transformer thermal modelling research, and simulation results can be equated to actual temperature rise experimental results [18][19][20][21][22][23][24][25][26]. For example, Ref.…”

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A fast calculation method of transient hot spot temperature for the design of dry‐type on‐board transformers

Guo

Cai

Zhu

et al. 2022

IET Electric Power Appl

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The design of the dry-type on-board traction transformer (OBTT), a new lightweight method in the traction system of electric multiple units, needs to consider the transient hot spot temperature (HST) under different railroad line operating conditions. In order to quickly calculate the transient HST of dry-type OBTT when operating under different railroad line conditions, a calculation method (hereinafter referred to as GP-HST method) by combining an enhanced genetic programming algorithm (GP) with computational fluid dynamics (CFD) is presented. First, intercept a section from the railroad line to be calculated and use the CFD method to calculate the transient HST of the section railroad line. Then, the enhanced GP modelling is driven by this section of railroad line measured and simulated data. Next, a calculation model with an implicit mathematical correlation between railroad line operating conditions and the dry-type OBTT transient HST is established. Finally, the calculation model quickly calculates the transient HST of the remaining railroad line in operation. To validate the presented method, the calculation model obtained using the presented method is used to calculate the transient HST for another railroad line with significantly different operating conditions, and it is compared with the direct use of the CFD method. The calculation results show that the GP-HST method reduces the simulation time of the CFD method from 950 to 0.25 min with a maximum error, mean absolute error, and mean relative error of 1.856 K, 0.778 K, and 0.22%, respectively, for a railroad line with a running time of about half an hour. This shows that the GP-HST method can effectively help to improve the design efficiency of dry-type OBTT. K E Y W O R D Scalculation model, genetic programing (GP), hot-spot temperature (HST), on-board traction transformer (OBTT) | INTRODUCTIONElectric multiple units (EMU) are the high-speed train of electric power supply. The heart of its power supply systemthe on-board traction transformer (OBTT), is responsible for stepping down the voltage of 25 kV in the supply network to the rated operating voltage of the equipment. In addition, OBTT is the heaviest single piece of equipment in the power supply system, accounting for about 12%-18% of the mass of vehicle weight [1][2][3]. Currently, all OBTTs in EMUs are of the oil-cooled type. The insulating oil required for a single oilimmersed OBTT alone is about 1.5 tons, about 30% of the total mass of OBTT. The excessive mass of the OBTT will not only limit train operating speed but also increase the operating energy consumption. Dry-type OBTT is currently the primary lightweight method of OBTT, which changes the traditional oilThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Thermal/fluid characteristics of the inline stacked plain‐weave screen as solar‐powered Stirling engine heat regenerators

Cited by 9 publications

References 19 publications

Investigation of the Upper Respiratory Tract of a Male Smoker with Laryngeal Cancer by Inhaling Air Associated with Various Physical Activity Levels

Investigation of the Upper Respiratory Tract of a Male Smoker with Laryngeal Cancer by Inhaling Air Associated with Various Physical Activity Levels

Relaxation and creep response of the alveolar lung to diagnosis and treatments for respiratory and lung disorders

A fast calculation method of transient hot spot temperature for the design of dry‐type on‐board transformers

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