Thematische Bibliographien / Parietal heat transfers

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Auswahl der wissenschaftlichen Literatur zum Thema „Parietal heat transfers“

Autor: Grafiati

Veröffentlicht am 1. Februar 2025

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Zeitschriftenartikel zum Thema "Parietal heat transfers"

Kharkwal, Himanshi, Mohammed Zamoum, Magali Barthés, François Lanzetta, Hervé Combeau und Lounès Tadrist. „Vapor bubble on a single nucleation site : Temperature and heat flux measurements“. Journal of Physics: Conference Series 2766, Nr. 1 (01.05.2024): 012148. http://dx.doi.org/10.1088/1742-6596/2766/1/012148.

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Abstract This work aimed at gaining a detailed understanding of heat transfer when boiling occurs on a heated substrate. More specifically, this work focuses on thermal transfers occurring at wall-fluid interfaces at the transition between natural convection and nucleate boiling regimes in pool boiling experiments. To avoid parasitic effects, the vapor bubble is created at a single artificial nucleation site. The boiling cell is instrumented with sensors for temperature measurement, pressure control, and parietal heat flux measurement. The fluid tested is Fluorinert FC-72. For providing a boiling surface and measuring heat flux, a boiling-meter consisting of a heating resistance, heat flux sensors and two thermocouples is used. This boiling-meter enables heat flux generation, the measurement of both temperature and heat flux, and can be rotated through 360°, enabling the influence of inclination to be studied. The boiling-meter is indented at its center to create a single vapor bubble. Thermal measurements are obtained and studied for different inclination angles between 0° and 180° at the saturation conditions. The results showed the nucleation site’s recurrent pattern of being active and inactive for whatever is the boiling surface inclination. Preliminary results are presented and discussed.

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Gueguen, Ronny, Guillaume Sahuquet, Samuel Mer, Adrien Toutant, Françoise Bataille und Gilles Flamant. „Experimental Study of an upflow Fluidized Bed: Identification of Fluidization Regimes“. MATEC Web of Conferences 379 (2023): 07005. http://dx.doi.org/10.1051/matecconf/202337907005.

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The concept of solar receiver using fluidized particles as heat transfer fluid is attractive from the point of view of its performance but also of the material used. In this concept, the receiver is composed of tubes subjected to concentrated solar radiation in which the fluidized particles circulate vertically. Circulation in the tubes, immersed in a “nurse” fluidized bed, is ensured thanks to a controlled pressure difference imposed on the latter and secondary aeration. This ventilation located at the bottom of the absorber tubes makes it possible to control the fluidization regimes. The latter strongly influence the parietal heat transfers and therefore the performance of the receiver. In order to better understand the conditions of appearance of these regimes and to better identify them, a study at room temperature was carried out with a tube 45 mm in internal diameter and 3.63 m in height. The tube is instrumented with several pressure sensors distributed over its height. More than 170 experiments have been performed exploring wide ranges of particle and aeration flow rates, with and without particle circulation. Signal processing methods, classically used in the scientific literature of fluidized beds, are applied. Combined together, these methods have enabled the identification of bubbling, pistoning (of the wall and axisymmetric), turbulent fluidization and rapid fluidization regimes. The pooling of all this information allows the establishment of a diagram of the fluidization regimes and their transition, showing that the local slip velocity is the key parameter governing the structure of the flow.

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Mukunthan, Shriram, Jochen Vleugels, Toon Huysmans, Kalev Kuklane, Tiago Sotto Mayor und Guido De Bruyne. „Thermal-Performance Evaluation of Bicycle Helmets for Convective and Evaporative Heat Loss at Low and Moderate Cycling Speeds“. Applied Sciences 9, Nr. 18 (05.09.2019): 3672. http://dx.doi.org/10.3390/app9183672.

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The main objective of the study was to investigate the thermal performance of five (open and closed) bicycle helmets for convective and evaporative heat transfer using a nine-zone thermal manikin. The shape of the thermal manikin was obtained by averaging the 3D-point coordinates of the head over a sample of 85 head scans of human subjects, obtained through magnetic resonance imaging (MRI) and 3D-printed. Experiments were carried out in two stages, (i) a convective test and (ii) an evaporative test, with ambient temperature maintained at 20.5 ± 0.5 °C and manikin skin temperature at 30.5 ± 0.5 °C for both the tests. Results showed that the evaporative heat transfer contributed up to 51%–53% of the total heat loss from the nude head. For the convective tests, the open helmet A1 having the highest number of vents among tested helmets showed the highest cooling efficiency at 3 m/s (100.9%) and at 6 m/s (101.6%) and the closed helmet (A2) with fewer inlets and outlets and limited internal channels showed the lowest cooling efficiency at 3 m/s (75.6%) and at 6 m/s (84.4%). For the evaporative tests, the open helmet A1 showed the highest cooling efficiency at 3 m/s (97.8%), the open helmet A4 showed the highest cooling efficiency at 6 m/s (96.7%) and the closed helmet A2 showed the lowest cooling efficiency at 3 m/s (79.8%) and at 6 m/s (89.9%). Two-way analysis of variance (ANOVA) showed that the zonal heat-flux values for the two tested velocities were significantly different (p < 0.05) for both the modes of heat transfer. For the convective tests, at 3 m/s, the frontal zone (256–283 W/m2) recorded the highest heat flux for open helmets, the facial zone (210–212 W/m2) recorded the highest heat flux for closed helmets and the parietal zone (54–123 W/m2) recorded the lowest heat flux values for all helmets. At 6 m/s, the frontal zone (233–310 W/m2) recorded the highest heat flux for open helmets and the closed helmet H1, the facial zone (266 W/m2) recorded the highest heat flux for the closed helmet A2 and the parietal zone (65–123 W/m2) recorded the lowest heat flux for all the helmets. For evaporative tests, at 3 m/s, the frontal zone (547–615 W/m2) recorded the highest heat flux for all open helmets and the closed helmet H1, the facial zone (469 W/m2) recorded the highest heat flux for the closed helmet A2 and the parietal zone (61–204 W/m2) recorded the lowest heat flux for all helmets. At 6 m/s, the frontal zone (564–621 W/m2) recorded highest heat flux for all the helmets and the parietal zone (97–260 W/m2) recorded the lowest heat flux for all helmets.

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Calisan, Mucahit, Muhammed Fatih Talu, Danil Yurievich Pimenov und Khaled Giasin. „Skull Thickness Calculation Using Thermal Analysis and Finite Elements“. Applied Sciences 11, Nr. 21 (08.11.2021): 10483. http://dx.doi.org/10.3390/app112110483.

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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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Lamping, K. G., C. D. Rios, J. A. Chun, H. Ooboshi, B. L. Davidson und D. D. Heistad. „Intrapericardial administration of adenovirus for gene transfer“. American Journal of Physiology-Heart and Circulatory Physiology 272, Nr. 1 (01.01.1997): H310—H317. http://dx.doi.org/10.1152/ajpheart.1997.272.1.h310.

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Gene transfer to the heart has been accomplished with intravascular administration of adenoviral vectors into the pericardial sac, by increasing the duration of exposure to the adenovirus, would result in gene expression in the pericardium and perhaps myocardium and therefore might provide an alternative method to intravascular administration for gene transfer. We injected a replication-deficient adenovirus (average 1 x 10(12) particles/ml in 3% sucrose; 1 x 10(10) plaque forming units/ml containing cDNA encoding a nuclear-targeted bacterial beta-galactosidase into the pericardial sac of dogs. Samples of the pericardium and heart were examined for enzymatic activity of beta-galactosidase and after histochemical staining with 5-bromo-4-chloro-3-indolyl-beta-D-galactopyranoside. One day after injection of the adenovirus (1-3 ml), beta-galactosidase activity was highest in the parietal pericardium and left atrial tissue and lower in the right and left ventricles. Histochemical expression of the transgene was predominantly in the visceral pericardium of atria and ventricles and occasionally in the epicardial myocytes, arterioles, and venules. Pretreatment with doxycycline (5 mg) before adenovirus administration increased transgene activity in left ventricles. Thus adenovirus injected into the pericardial sac provides an effective method for gene transfer to the visceral and parietal pericardium over atria and ventricles.

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Mammadova, J. P., A. P. Abdullaev, R. M. Rzayev, R. F. Kelbaliev, S. H. Mammadova und I. V. Musazade. „The study of temperature regimes of a pipe wall under turbulent regime and supercritical pressures“. International Journal of Modern Physics B 34, Nr. 19 (27.07.2020): 2050182. http://dx.doi.org/10.1142/s0217979220501829.

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The flow regimes of liquids encountered in engineering practice are mainly turbulent due to their structure, with which the features of such flows at supercritical pressure are considered in the work and some results are compared with similar ones obtained at low Reynolds numbers. Under these conditions, the physical properties of the fluid change sharply in the parietal layer and, depending on the values of the heat flux density and temperature, the area of sharp changes in physical properties can move along the flow cross section. Depending on the influence of these factors, the nature of the fluid flow can change, which affects the patterns of heat transfer and, accordingly, the nature of the distribution of wall temperature. In particular, conditions were identified for the appearance of a primary and secondary improved heat transfer regime. The possibility of the existence of an anomalous behavior of heat transfer during a turbulent flow of aromatic hydrocarbons was revealed, the nature of the distribution of the wall temperature along the length of the experimental tube is examined, and the influence of changes in the thermophysical properties of the substance on it is analyzed. The experimental data for water and toluene with a deteriorated heat transfer mode deviate from the calculated by [Formula: see text]25%. As is known, the flow regime of fluids in engineering practice is mainly turbulent in structure. Therefore, it is very important to study the characteristics of such flows at supercritical pressure and compare some results with similar results obtained at low Reynolds numbers.

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Greco, Alberto, Luca Faes, Vincenzo Catrambone, Riccardo Barbieri, Enzo Pasquale Scilingo und Gaetano Valenza. „Lateralization of directional brain-heart information transfer during visual emotional elicitation“. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 317, Nr. 1 (01.07.2019): R25—R38. http://dx.doi.org/10.1152/ajpregu.00151.2018.

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Previous studies have characterized the physiological interactions between central nervous system (brain) and peripheral cardiovascular system (heart) during affective elicitation in healthy subjects; however, questions related to the directionality of this functional interplay have been gaining less attention from the scientific community. Here, we explore brain-heart interactions during visual emotional elicitation in healthy subjects using measures of Granger causality (GC), a widely used descriptor of causal influences between two dynamical systems. The proposed approach inferences causality between instantaneous cardiovagal dynamics estimated from inhomogeneous point-process models of the heartbeat and high-density electroencephalogram (EEG) dynamics in 22 healthy subjects who underwent pleasant/unpleasant affective elicitation by watching pictures from the International Affective Picture System database. Particularly, we calculated the GC indexes between the EEG spectrogram in the canonical θ-, α-, β-, and γ-bands and both the instantaneous mean heart rate and its continuous parasympathetic modulations (i.e., the instantaneous HF power). Thus we looked for significant statistical differences among GC values estimated during the resting state, neutral elicitation, and pleasant/unpleasant arousing elicitation. As compared with resting state, coupling strength increases significantly in the left hemisphere during positive stimuli and in the right hemisphere during negative stimuli. Our results further reveal a correlation between emotional valence and lateralization of the dynamical information transfer going from brain-to-heart, mainly localized in the prefrontal, somatosensory, and posterior cortexes, and of the information transfer from heart-to-brain, mainly reflected into the fronto-parietal cortex oscillations in the γ-band (30 −45 Hz).

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Laouar, Abdelghani, und El Hacene Mezaache. „Numerical Study of the Effect of Parietal Suction and Injection on Momentum and Heat Transfer of Laminar and Turbulent External Flow“. Energy Procedia 36 (2013): 1101–10. http://dx.doi.org/10.1016/j.egypro.2013.07.125.

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Prudnikov, A. G., V. K. Mamaev, N. N. Zakharov, V. V. Severinova und A. N. Tarasenko. „The active external heat and mass transfer multifunctional “one-wall” model with “nullified” friction resistance parietal boundary layer for the high-speed aircraft“. Journal of Physics: Conference Series 1683 (Dezember 2020): 022072. http://dx.doi.org/10.1088/1742-6596/1683/2/022072.

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Gotloib, Lazaro, Pnina Bar-Sella und Abshalom Shostak. „Reduplicated Basal Lamina of Small Venules and Mesothelium of Human Parietal Peritoneum: Ultrastructural Changes of Reduplicated Peritoneal Basement Membrane“. Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis 5, Nr. 4 (Oktober 1985): 212–15. http://dx.doi.org/10.1177/089686088500500402.

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We examined under the electron microscope samples of parietal peritoneum obtained from nine nondiabetic chronic uremics -six of them on maintenance intermittent peritoneal dialysis, ranging in age from 52 to 82 years -mean 64.4 ± 8.1 years and of nine non-uremic, non-diabetic patients -mean age 40.7 ± 12.2 years. Postcapillary venules and small venules showed areas with several layers of reduplicated basal lamina. Some microvessels showed gaps in basallamina with and/or without focal reduplication. Reduplicated submesothelial basal lamina was found in only one patient. These changes were not observed in the nine non-uremic, non-diabetic controls. To the best of our knowledge, this is the first description in humans of such alterations in the aforementioned locations, which may well be secondary to aging and/or to the intense mesothelial renewal observed in I.P.D. patients. We need to determine the possible influence of these ultrastructural changes on transperitoneal transfer of water and solutes during peritoneal dialysis. The basal lamina of blood vessels may not be of uniform thickness. Human non-diabetic adults show significant increase in capillary basal lamina thickness as one moves from head to foot (1). Those regional variations may be related to differences in venous hydrostatic pressure effective on the capillary bed (1). This paper decribes the first observations of reduplicated basal lamina of microvessels in the parietal peritoneum and of that subjacent to mesothelial cells in elderly, non-diabetic uremic patients.

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Dissertationen zum Thema "Parietal heat transfers"

Tida, Tsilanizara. „Convection turbulente dans le cas d'un jet parietal plan d'eau“. Nantes, 1988. http://www.theses.fr/1988NANT2004.

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Butaye, Edouard. „Modélisation et simulations résolues d'écoulement fluide-particules : du régime de Stokes aux lits fluidisés anisothermes“. Electronic Thesis or Diss., Perpignan, 2024. http://www.theses.fr/2024PERP0029.

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Les centrales solaires à tour utilisent le flux solaire concentré pour chauffer un fluide caloporteur et générer de l'électricité grâce à un cycle thermodynamique. Pour augmenter le rendement de conversion thermique/électrique, on cherche à augmenter la température de sortie du récepteur à au moins 800°C. Une alternative aux fluides conventionnels réside dans l'utilisation de particules fluidisées par de l'air pour ainsi augmenter la température de travail et maximiser le transfert de chaleur pariétal. Les particules solides utilisées peuvent supporter des températures dépassant les 1000°C sans dégradation de leurs propriétés physiques et peuvent également stocker efficacement la chaleur. Pour répondre à ces enjeux, il est nécessaire de caractériser l'écoulement au sein du tube récepteur ainsi que les mécanismes physiques de transfert de chaleur dans ces configurations. Ce travail s'intéresse particulièrement à la description locale des écoulements anisothermes fluide-particules à l'aide de simulations numériques directes en particules résolues (PR-DNS) réalisées en calcul hautes performances. Des améliorations de l'outil permettant de réaliser des simulations résolues de ces écoulements sont tout d'abord apportées au code pour calculer des grandeurs d'intérêts et optimiser la méthode. Ensuite, plusieurs configurations de lits fluidisés liquide-solide sont étudiées pour caractériser extensivement la dynamique de l'écoulement. Les transferts thermiques pariétaux sont également capturés ainsi que les transferts thermiques entre le fluide et les particules. Des configurations gaz-solide sont étudiées afin de valider l'outil de simulation numérique pour modéliser ces écoulements. Finalement, une nouvelle échelle de résolution est proposée, en particules résolues avec une correction sous-mailles (PR-SCS). Cette échelle permet de modéliser précisément les efforts hydrodynamiques malgré une résolution grossière
Solar tower power plants harness concentrated solar flux to heat a fluid and generate electricity through a thermodynamic cycle that generates steam and drives a turbo-alternator. To increase thermal/electrical conversion efficiency, it is a required to raise the receiver outlet temperature to at least 800°C. An alternative to conventional fluids is to use air-fluidized particles to raise the working temperature and maximize parietal heat transfer. The solid particles used can withstand temperatures in excess of 1000°C without degrading their physical properties, and store heat efficiently. To meet these challenges, it is necessary to characterize the flow within the receiving tube, as well as the physical mechanisms of heat transfer in these configurations. This work focuses on the local description of anisothermal fluid-particle flows using particle-resolved direct numerical simulations (PR-DNS) with high-performance computing. Improvements are first implemented in the code to compute quantities of interest and optimize the numerical method. Next, several liquid-solid fluidized bed configurations are studied to extensively characterize flow dynamics. Parietal heat transfers are also computed as well as fluid-particle heat transfers. Gas-solid configurations are studied to validate the numerical simulation tool for modeling these flows. Finally, a new scale of resolution is proposed, referred to as Particle Resolved - Subgrid Corrected Simulation (PR-SCS). This scale enables hydrodynamic forces to be accurately modeled despite the coarse resolution

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Turlat, Christine. „Etude sur maquette de la convection naturelle dans l'habitat par interferometrie holographique : determination des regimes d'ecoulements parietaux“. Toulouse 3, 1987. http://www.theses.fr/1987TOU30018.

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Etude du transfert de chaleur et des regimes d'ecoulement d'un local avec une paroi chauffee, une paroi opposee froide, et les quatres autres paroi isothermes. Resultats d'une maquette a l'echelle 1/4

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Thibaud, Laurent. „Contribution à l'étude de la convection naturelle à l'intérieur d'un cylindre vertical poreux soumis à une densité de flux thermique parietal constante : application aux silos à grains“. Poitiers, 1988. http://www.theses.fr/1988POIT2299.

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Buchteile zum Thema "Parietal heat transfers"

Rolls, Edmund T. „The dorsal visual system“. In Brain Computations and Connectivity, 201–20. 2. Aufl. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780198887911.003.0003.

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Abstract The dorsal visual system computes information about where objects are in space, and their motion, and this is used for actions performed in space. The connectivity is described of the human dorsal visual cortical stream for visual motion leading to intraparietal visual regions and then to parietal area 7 regions for actions in space. These computations require coordinate transforms from retinal coordinates to head based coordinates, and then in parietal cortex regions to coordinates for reaching into space, and for allocentric, world-based, spatial coordinates. Recent approaches to how these transforms are performed, with analogies to transform invariance learning in the ventral visual system, are described.

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Rolls, Edmund T. „The dorsal visual system“. In Brain Computations, 176–91. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198871101.003.0003.

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The dorsal visual system computes information about where objects are in space, and their motion, and this is used for actions performed in space. This requires coordinate transforms from retinal coordinates to head based coordinates, and then in parietal cortex areas to coordinates for reaching into space, and for allocentric, world-based, spatial coordinates. Recent approaches to how these transforms are performed, with analogies to transform invariance learning in the ventral visual system, are described.

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Colby, Carol L. „Parietal cortex constructs action-oriented spatial representations“. In The Hippocampal and Parietal Foundations of Spatial Cognition, 104–26. Oxford University PressOxford, 1998. http://dx.doi.org/10.1093/oso/9780198524533.003.0006.

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Abstract We construct a representation of the world around us in order to act. This representation must transform sensory information from the coordinates of several receptor surfaces (e.g. retina, cochlea or skin surface) into the motor coordinates needed for each effector system (e.g. eye, head, limb, trunk). The nature of this representation has been the subject of much debate (see Stein 1992, for discussion). The traditional view, strongly supported by subjective experience, is that we construct a single spatial map of the world in which objects and actions are represented in a unitary framework. The alternative view holds that the brain constructs multiple, action-oriented spatial representations in which objects and locations are represented relative to the body (egocentric representations) or relative to extrinsic reference frames not tied to the body (allocentric representations).

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Konferenzberichte zum Thema "Parietal heat transfers"

Abassi, Wafik, Fethi Aloui, Sassi Ben Nasrallah und Jack Legrand. „Use of Lattice-Boltzmann Method in Mass Transfer for the Wall Shear Stress Calculation in an Unsteady Laminar Flow Downstream of a Cylinder Located in a 2D Rectangular Channel“. In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72232.

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A Lattice Boltzmann method (LBM) is proposed to study the flow and mass transfer in the parietal zone of a channel containing a blocking circular obstacle at low Reynolds number. For such configuration, the variation of Re based on cylinder diameter leads to different regime that fluid may occur during it flowing. Hence, this varied behaviour of flow downstream of the obstacle affects the mass transfer rate in the parietal zone of the channel. A sensor with zero concentration on the surface is placed at different locations on the channel wall downstream of the cylinder. Flow velocity and concentration profile of diffusing species on the sensor were evaluated and analyzed for different Reynolds. The Sherwood numbers are calculated and compared with available experimental data. For the present simulation, LBM is based on the D2Q9 lattice model and the single relaxation time approach called BGK method. The challenge of this work is to extend the use of the mesoscopic method (LBM) for a flow problem to studying the enhancement of the rate of mass transfer to channel wall downstream of the obstacle. The numerical results are in good agreement with the benchmark result available in the literature. The highlight of calculation is the flexibility to deal with the boundary conditions for such a problem. The result indicates that LBM is useful for simulation of fluid flows with mass transfer as well as heat transfer.

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