Dynamic equations of a transversely isotropic, highly porous, fibrous material including oscillatory heat transfer effects

Semeniuk, Bradley; Göransson, Peter; Dazel, Olivier

doi:10.1121/1.5129368

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…The current equation of thermal conduction in continuous environments can be obtained on the basis of the principle of conservation of thermal energy. The application of the heat transfer relationship for systems with isotropic materials is as follows [34]:…”

Section: Thermal Analysis Of 3d Solid Modelsmentioning

confidence: 99%

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

et al. 2021

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In this study, the skull bone thicknesses of 150 patients ranging in age from 0 to 72 years were calculated using a novel approach (thermal analysis), and thickness changes were analyzed. Unlike conventional thickness calculation approaches (Beam Propagation, Hildebrand), a novel heat transfer-based approach was developed. Firstly, solid 3D objects with different thicknesses were modeled, and thermal analyses were performed on these models. To better understand the heat transfer of 3D object models, finite element models (FEM) of the human head have been reported in the literature. The FEM can more accurately model the complex geometry of a 3D human head model. Then, thermal analysis was performed on human skulls using the same methods. Thus, the skull bone thicknesses at different ages and in different genders from region to region were determined. The skull model was transferred to ANSYS, and it was meshed using different mapping parameters. The heat transfer results were determined by applying different heat values to the inner and outer surfaces of the skull mesh structure. Thus, the average thicknesses of skull regions belonging to a certain age group were obtained. With this developed method, it was observed that the temperature value applied to the skull was proportional to the thickness value. The average thickness of skull bones for men (frontal: 7.8 mm; parietal: 9.6 mm; occipital: 10.1 mm; temporal: 6 mm) and women (frontal: 8.6 mm; parietal: 10.1 mm; occipital: 10 mm; temporal: 6 mm) are given. The difference (10%) between men and women appears to be statistically significant only for frontal bone thickness. Thanks to the developed method, bone thickness information at any desired point on the skull can be obtained numerically. Therefore, the proposed method can be used to help pre-operative planning of surgical procedures.

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Section: Thermal Analysis Of 3d Solid Modelsmentioning

confidence: 99%

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

et al. 2021

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“…These materials can be used in buildings and for both industrial and vehicle engineering. They can be also used where the materials should be able to withstand high temperatures (~250-300 • C); for example, for insulating heating pipes transporting hot water or steam or for insulating furnaces [14]. Pipes are not only insulated to reduce heat loss.…”

Section: Application Possibilities and Experiences Of Micro-fiber Based Insulationsmentioning

confidence: 99%

“…Thermal insulation of vehicles such as aircraft is very important, too. Moreover, choosing the proper thermal insulation for both vehicles and buildings or HVAC appliances is also important from an acoustic point of view [14]. Reduction in unwanted noise by insulation is also essential.…”

Section: Introductionmentioning

confidence: 99%

Systematic Analysis of Micro-Fiber Thermal Insulations from a Thermal Properties Point of View

2021

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In the European Union, almost 40% of all energy consumption comes from buildings, while another 20–25% comes from transport. In the European Union, including Hungary, only buildings with almost-zero energy demand could be built after 2020, and the use of renewable energies must be strengthened. The Renewable Directive stipulated that by 2020, the share of renewable energy in buildings must be 25%, and in transport it must be 10%; the use of electric vehicles is vital. There are about four million dwellings in Hungary, of which approximately three million need to be renovated, and only some of these (a few hundred) meet the cost-optimized level of the 2020 directive. The use of insulation materials is very important in the transport sector, too. Insulation materials are also used by aircraft and electric vehicles. To reduce the energy loss from buildings, different insulation materials can be used; investigations of insulation materials are very important. This paper presents a comprehensive research report on insulation materials which could be used for building elements, HVAC (heating, ventilation, and air conditioning appliances) equipment, and vehicles. In this paper, laboratory investigations will be presented along with calculations to better understand the properties and behavior of these materials. For this, firstly structural analysis with scanning electron microscope will be presented. Moreover, the paper will present thermal conductivity and combustion heat measurement results. The sorption and hydrophobic behavior of the materials will be also revealed. Finally, the article will also display differential scanning calorimetry measurements and Raman spectroscopy results of the samples. The research was conducted on four different types of colorized microfiber lightweight wool insulation.

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“…There is always an interaction between the environment and the load flow of transmission lines in the normal operation of high voltage overhead transmission lines [7], which is related to wind oscillation of transmission lines [8,9]. Of all wind oscillations on the transmission line, it is considered to be the normal operation of the transmission line, as it is most likely to occur and last for the longest time [10]. However, long-term wind vibration can lead to wire fatigue, disconnection and tower component damage, which has adverse effects.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Fluid-Dynamic and Heat Transfer Effects Generated by a Fixed Electricity Transmission Line Interacting with an External Wind

Jia¹,

Shang²,

Nan³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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The flow past a fixed single transmission conductor and the related heat transfer characteristics are investigated using computational fluid dynamics and a relevant turbulence model. After validating the method through comparison with relevant results in the literature, this thermofluid-dynamic problem is addressed considering different working conditions. It is shown that the resistance coefficient depends on the Reynolds number. As expected, the Nusselt number is also affected by Reynolds number. In particular, the Nusselt number under constant heat flux is always greater than that under a constant wall temperature.

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Dynamic equations of a transversely isotropic, highly porous, fibrous material including oscillatory heat transfer effects

Cited by 11 publications

References 18 publications

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

Systematic Analysis of Micro-Fiber Thermal Insulations from a Thermal Properties Point of View

CFD Analysis of Fluid-Dynamic and Heat Transfer Effects Generated by a Fixed Electricity Transmission Line Interacting with an External Wind

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