Academic literature on the topic 'Heat flow'
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Journal articles on the topic "Heat flow"
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Majorowicz, Jacek Andrew, Marek Grad, and Marcin Polkowski. "Terrestrial heat flow versus crustal thickness and topography – European continental study." International Journal of Terrestrial Heat Flow and Applications 2, no. 1 (March 21, 2019): 17–21. http://dx.doi.org/10.31214/ijthfa.v2i1.30.
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The relation between heat flow, topography and Moho depth for recent maps of Europe is presented. Newest heat flow map of Europe is based on updated database of uncorrected heat flow values to which paleoclimatic correction is applied across the continental Europe (Majorowicz and Wybraniec 2010). Correction is depth dependent due to a diffusive thermal transfer of the surface temperature forcing, of which glacial–interglacial history has the largest impact. This explains some very low uncorrected heat flow values of 20–30 mW/m2in shallow boreholes in the shields, shallow basin areas of the cratons, and in other areas including orogenic belts where heat flow was likely underestimated due to small depth of the temperature logs. New integrated map of the European Moho depth (Grad et al 2009) is the first high resolution digital map for European plate, which is understood as an area from Ural Mountains in the east to mid-Atlantic ridge in the west, and Mediterranean Sea in the south to Spitsbergen and Barents Sea in Arctic, in the north. For correlation we used the following: onshore heat flow density data with palaeoclimatic correction (5318 locations), topography map (30x30 arc seconds, by Danielson and Gesch 2011) and Moho map by Grad et al (2009), providing longitude, latitude and Moho depth (with resolution of 0.1 degree). Analysis was limited to locations for which datasets were available. The area of continental Europe has been divided into two large domains: Precambrian East European craton and Palaeozoic Platform of the West Europe. In addition, two smaller areas were considered, corresponding to Scandinavian Caledonides and Anatolia. The results obtained reveal significantly different correlations between Moho depth, elevation and heat flow for these regions. For each region detailed analysis of these relations in different elevation ranges are presented. In general, it is observed that Moho depth is more significant for heat flow than elevation. Depending on the region and elevation range, heat flow value is up to two times larger than Moho depth, while relation of heat flow to elevation has much more variability.
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Baranov, A. V., and S. A. Yunitsky. "Viscoelastic fluid flow through a porous filler during molding of composite products in closed molds." Plasticheskie massy, no. 1-2 (March 19, 2020): 17–18. http://dx.doi.org/10.35164/0554-2901-2020-1-2-17-18.
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The flow and heat transfer during impregnation of the filler with a non-Newtonian liquid in the process of forming composite products in closed forms is investigated. The flow is described by the Brinkman equation. In terms of rheology, medium is the Phan-Thien-Tanner fluid. The problem is solved by a numerical method of finite differences.
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Stankevich, T. S., D. Balner, M. Trcka, and A. Thomitzek. "Prompt forecasting of heat flows under fire conditions in a vertical steel tank having an ANFIS protective wall." Pozharovzryvobezopasnost/Fire and Explosion Safety 29, no. 5 (December 2, 2020): 13–39. http://dx.doi.org/10.22227/pvb.2020.29.05.13-39.
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Introduction. Tanks and tank farms are widespread in many constituent entities of the Russian Federation and are among the most important elements of the model for the production, treatment, transportation and processing of oil and oil products. It is relevant both at the Russian and global levels to ensure that fire safety is arranged for tank farms to reduce highest risk levels according to the risk-based safety model. In the context of information and communication technology (ICT) developments and introduction of ICT into the operation and management of various facilities, over the past decades advanced methods have emerged for predicting the occurrence and development of emergency situations at facilities and enhancing management decisions on containment and elimination of emergency situations including fires.Goals and objectives. In this paper, the authors present a model that they developed to promptly forecast heat flows using artificial neural networks. The forecast model will improve the safety of fire brigade personnel responsible for extinguishing fires inside ground-based vertical steel tanks having protective walls. In the research, the authors place special emphasis on identifying dependence between the heat flow and the wind load. Methods. To achieve this goal, the authors arranged and conducted a series of experiments, collected experimental data on heat flows, and created training and test samples.Results. Dependences between heat flows and environmental factors were identified by constructing adaptive neuro-fuzzy inference systems or adaptive network-based fuzzy inference systems (ANFIS). Various types of membership functions, optimisation and system generation methods were compared and it was found out that for ANFISs, prediction of heat flows with regard to and disregarding wind loads were optimal, if subcluster and hybrid optimisation methods were used, as they had lowest error values for samples.Discussion. The analysis shows that wind speed and tank location can rise temperatures of the air, tank wall and petrol. Therefore, despite the complexity of the analysis, the regard for all these factors makes it possible to identify a safe distance between a burning tank and firefighters.Conclusions. The research made it possible to develop a model for prompt heat flow forecasting with the help of artificial intelligence elements (ANFIS). The results obtained in the course of the work make it possible to increase the efficiency of prompt forecasting of the dynamic behaviour of fire inside tanks and tank farms and optimize managerial decision-making by responsible persons.
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Padhi, Sukanya, and Itishree Nayak. "Analysis of Electro-MHD of Third Grade Fuid Flow Through Porous Channel." European Journal of Pure and Applied Mathematics 13, no. 5 (December 27, 2020): 1270–84. http://dx.doi.org/10.29020/nybg.ejpam.v13i5.3707.
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This paper examines the Electro-MHD flow and heat transfer of a third grade fluid passing through a porous channel. An unidirectional and one-dimensional flow is propelled with the aid of lorentz force generated due to interaction of vertically applied magnetic field along with horizontally applied electric field. The equations of momentum and energy governing the third grade fluid flow are transformed to algebraic equation from nonlinear partial differential equation by implementing fully implicit finite difference scheme and solution is obtained by damped-Newton method. Lastly, the problem is simulated using MATLAB and the influence on velocity and temperature profiles with variation of non-dimensional parameters are depicted graphically. The noteworthy findings of this study is that the increasing values of elastic parameter α and non-Newtonian parameter γ diminishes the flow velocity and results in enhancement of temperature profile. A completely contrasting effect is observed for increasing values of strength of electric and magnetic field.
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Kot, Valery A. "Integral methods of solving heat-conduction problems: a new concept (Dirichlet condition)." Doklady of the National Academy of Sciences of Belarus 63, no. 4 (September 13, 2019): 485–95. http://dx.doi.org/10.29235/1561-8323-2019-63-4-485-495.
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On the basic of consideration of the heat-conduction problem for a semi-bounded space with a temperature profile defined by a parabola with an exponent n, a new concept of construction of constitutive involves the introduction of a local function for a heat flow or for the temperature, with is determined from the heat-conduction equation. The approach proposed made it possible to obtain a number of new integral relation: an improved integral for the temperature momentum, an integral of a quadratic heat flow, and an integral of a quadratic temperature function. Two Schemes of optimizing the exponent n with the use of the error norms E1 and are proposed. As compared to the Langford norm, the indicated error norms made it possible to substantially increase the approximation accuracy of solutions of the problem posed.
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Akolade, M. T., A. S. Idowu, B. O. Falodun, and J. U. Abubakar. "The paradox of heat conduction, influence of variable viscosity, and thermal conductivity on magnetized dissipative Casson fluid with stratification models." Proyecciones (Antofagasta) 40, no. 6 (December 1, 2021): 1657–82. http://dx.doi.org/10.22199/issn.0717-6279-4357-3841.
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The boundary layer flow of temperature-dependent variable thermal conductivity and dynamic viscosity on flow, heat, and mass transfer of magnetized and dissipative Casson fluid over a slenderized stretching sheet has been studied. The model explores the Cattaneo-Christov heat flux paradox instead of the Fourier’s law plus the stratifications impact. The variable temperature-dependent plastic dynamic viscosity and thermal conductivity were assumed to vary as a linear function of temperature. The governing systems of equations in PDEs were transformed into non-linear ordinary differential equations using the suitable similarity transformations, hence the approximate solutions were obtained using Chebyshev Spectral Collocation Method (CSCM). Effects of pertinent flow parameters on concentration, temperature, and velocity profiles are presented graphically and tabled, therein, thermal relaxation and wall thickness parameters slow down the distribution of the flowing fluid. A rise in Casson parameter, temperature-dependent thermal conductivity, and velocity power index parameter increases the skin friction thus leading to a decrease in energy and mass gradient at the wall, also, temperature gradient attain maximum within 0.2 - 1.0 variation of Casson parameter.
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Pribytkov, I. A., and S. I. Kondrashenko. "AERODYNAMICS OF JETS INTERACTING WITH A FLAT SURFACE." Izvestiya. Ferrous Metallurgy 62, no. 4 (June 20, 2019): 263–69. http://dx.doi.org/10.17073/0368-0797-2019-4-263-269.
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In this paper, the development features of a single free jet of hightemperature nitrogen interacting with a flat surface were studied. Calculation of the heat exchange process during heating by the attacking jets is very difficult to implement analytically due to complexity of the gas-dynamic processes occurring both in a single jet and in a system of jets interacting with the metal. The computational difficulties are aggravated by the fact that when interacting with the surface the jet as such disappears. The flat (fan) flow interacts with the surface: form, aerodynamic properties and thermal state of the flow strongly differ from those of the original jet. The studies were conducted on the basis of numerical simulation in the FloEFD software and computing complex for multiphysical simulation based on solution of the equations of gas dynamics and heat transfer. The solved system of equations consisted of Navier-Stokes equations, equations of energy and continuity and was supplemented by k – ε turbulence model. A three-dimensional model was developed for simulation, the necessary properties, initial and boundary conditions were specified. In the study of aerodynamics of a single high-temperature jet interacting with the surface, the main defining values were: nitrogen flow rate from the nozzle U0 , nitrogen temperature T, internal diameter of the nozzle d0 , distance from the nozzle section to the surface h, distance from the critical point (point of intersection of the jet axis with the surface) along the flow radius r. Data on the gas velocity decrease as the jet develops due to the loss of initial energy to engage the motionless surrounding gas in motion, is presented. The studies have shown that increase in the initial velocity of gas outflow brings the area of higher velocities closer to the surface both in the jet itself and in the fan jet. This factor contributes to heat transfer intensification. In addition, high speeds increase the total thickness of the fan flow and reduce the thickness of hydrodynamic boundary layer, which increases with distance from the critical point.
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Wu, Yingwei, Yandong Hou, Liu Wang, Simin Luo, G. H. Su, Wenxi Tian, and Suizheng Qiu. "Review on heat transfer and flow characteristics of liquid sodium (1): Single-phase." Progress in Nuclear Energy 104 (April 2018): 306–16. http://dx.doi.org/10.1016/j.pnucene.2017.11.004.
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Shateyi, S., and S. S. Motsa. "Effects of Chemical Reaction and Soret Effect on Mixed Heat and Mass Transfer for Hiemenz flow through Porous Media with Heat Source." Applied Mechanics and Materials 197 (September 2012): 712–16. http://dx.doi.org/10.4028/www.scientific.net/amm.197.712.
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The effects of chemical reaction and thermal-diffusion mixed convection heat and mass transfer for Hiemenz flow through porous media has been studied. The plate is embedded in a uniform porous medium in order to allow for possible fluid wall suction or blowing and has a power-law variation of both the wall temperature and concentration. We used similarity solution to transform the system of partial differential equations, into a boundary value problem of coupled ordinary differential equations. We then solve these ordinary differential equations by a MATLAB routine bvp4c. We conducted a parametric study of all involved parameters and the results represented graphically.
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Liu, Yan Feng, Hong Wei Li, Jing Wei Zhang, and Jin Xue. "Liquid Flow Characteristics in Microchannels." Applied Mechanics and Materials 130-134 (October 2011): 1484–90. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1484.
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A three-dimensional model was developed to simulate the laminar flow and convective heat transfer in rectangular silicon microchannels，which have hydraulic diameter of 95.3，92.3 ,85.8 , 80 and 75μm respectively．The rationality of the simulation methods and results were validated by comparing with experimental data. The simulation results indicate that the aspect ratio has a significant impact on the Poiseuille number. Conventional fluid flow theory is fit for researching the fluid flow in microchannels, Po is a constant that is not dependent on the Reynolds number.
Dissertations / Theses on the topic "Heat flow"
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Machicoane, Nathanaël. "Particules matérielles en écoulement turbulent. Transport, dynamique aux temps longs et transfert thermique." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2014. http://tel.archives-ouvertes.fr/tel-01070651.
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Nous nous intéressons au transport turbulent de particules de taille grande devant l'échelle de Kolmogorov. Cette situation se retrouve à la fois dans les écoulements naturels (comme le transport de sédiments) et dans les écoulements industriels (solutés solides dans un mélangeur par exemple). Pour aborder ce problème, nous étudions la dynamique de particules de taille proche de l'échelle intégrale, de densité égale ou légèrement différente de celle du fluide, dans un écoulement turbulent de von Kármán contra-rotatif, à l'aide d'un montage de suivi lagrangien rapide. L'étude de la dynamique rapide des particules montre une diminution forte des fluctuations selon la taille, mais aussi l'apparition d'un phénomène nouveau : à partir d'une certaine taille, les particules n'explorent plus l'écoulement de façon homogène. Cette exploration préférentielle est liée à la structure moyenne de l'écoulement de von Kármán, qui crée une force de piégeage. Cette force devient alors supérieure aux fluctuations des particules quand leur taille dépasse une taille critique. Une étude dans le régime laminaire, où l'écoulement moyen domine largement les fluctuations, a en effet mis en évidence un piégeage fortement accru. Les particules orbitent alors pendant des temps très longs autour des attracteurs stables des particules fluides de l'écoulement laminaire. Même en régime pleinement turbulent, le déplacement des particules entre ces zones s'effectue sur des durées longues, décorrélées des temps de la dynamique turbulente. Nous avons adapté les outils d'analyse pour caractériser cette dynamique et l'avons comparée à celle de particules isodenses dans un écoulement de von Kármán qui possède deux états asymétriques. Nous avons également élaboré un modèle qui reproduit ces caractéristiques dans les cas symétrique et asymétrique. Ces questions sont intimement liées au transfert de masse ou de chaleur entre une particule et l'écoulement. Nous avons donc aussi étudié la fusion de grosses billes de glace en turbulence développée, analysant l'influence de la taille des billes et de la vitesse de glissement sur le transfert thermique, à l'aide d'un montage d'ombroscopie afocale. Nous avons notamment montré que les grosses billes de glace fondent dans un régime ultime de convection forcée lorsqu'elles sont librement advectées par l'écoulement.
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Dello-Iacovo, M. "South Australian Heat Flow Anomaly: source and implications for geothermal energy." Thesis, 2014. http://hdl.handle.net/2440/109977.
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This item is only available electronically.The South Australian Heat Flow Anomaly is a broad region (>400 km wide) in Proterozoic South Australia defined by drill holes with anomalously high heat flow estimates yielding a mean of 92 +/- 10 mW m−2, compared to a global Proterozoic mean of 49-54 mW m−2. This study will conclusively determine the primary source of this anomalous heat flow. Thermal conductivities of 145 drill core samples have been measured using an optical thermal conductivity scanner. These were utilised with thermal conductivity and temperature profiles provided by Petratherm and the Department of State Development to make five new heat flow estimates in the Curnamona and Mount Painter provinces using the product and thermal resistance methods. Measured surface heat flows fall between 84.352 and 128.051 mW m−2. Significant lateral variations in surface heat flow support previous work suggesting shallow crustal radiogenic heat generation, primarily in Mesoproterozoic high heat producing granites. Analysis of existing deep seismic data has revealed a significantly cooler and thicker lithosphere in the Proterozoic South Australia compared with regions dominated by mantle heat flow such as southeastern Australia. Geotherms have been computed for steady-state regimes to demonstrate that the surface heat flow evident in the South Australian Heat Flow Anomaly is consistent with elevated upper crustal source. Thick, thermally insulating sedimentary cover in the Curnamona and Mount Painter provinces and high temperatures at shallow depths are encouraging for geothermal energy exploration, and geothermal prospectivity for these provinces was examined. Lateral thermal conductivity variations of stratigraphies in the Curnamona Province have been assessed, revealing that more data must be collected to use thermal conductivity from neighbouring boreholes as a proxy for heat flow estimates.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2014
Conference papers on the topic "Heat flow"
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Freitas, Samuel A., Cristiano A. da Costa, and Gabriel De O. Ramos. "Coronary Artery Disease Automatic Classification." In Escola Regional de Computação Aplicada à Saúde. Sociedade Brasileira de Computação - SBC, 2021. http://dx.doi.org/10.5753/ercas.2021.17431.
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Atherosclerosis represents the restriction of blood flow in the heart muscle and is one of the main causes of death in the world. The assessment of atherosclerosis is challenging and is currently evaluated by the Fractional Flow Reserve (FFR) and the Quantitative Flow Ratio (QFR). Both exams are based on angiography, which is the gold standard for geometrical assessment. This study presents a pipeline to automatically determine the presence of narrowing in the right coronary artery (RCA) angiography exams, segmenting the artery silhouette, selecting regions of interest (ROIs) followed by a classification model. Initial results suggest a valid sequence of steps to classify the lesion, but require some improvements in the network architecture for better classification accuracy.
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DeBuys, Christian, Florin Ghesu, Reza Langari, and Young-Ho Kim. "Design and validation of zero-slack separable manipulator for Intracardiac Echocardiography." In The Hamlyn Symposium on Medical Robotics: "MedTech Reimagined". The Hamlyn Centre, Imperial College London London, UK, 2022. http://dx.doi.org/10.31256/hsmr2022.10.
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ntracardiac echocardiography (ICE) catheter, known to have a strong ability to visualize cardiac structures and blood flow from within the heart, is now being favorably used in cardiac catheterization and electrophysiology as an advanced imaging approach. However, clinicians require substantial training and experience to become comfortable with steering the catheter to localize and measure the area of treatment to watch for complications while device catheters are deployed in another access. Thus, it is reasonable that a robotic-assist system to hold and actively manipulate the ICE catheter could ease the workload of the physician. There exist commercially-available robotic systems [1] and research prototypes [2, 3] for ICE catheter manipulation. They all use existing commercially available ICE catheters (e.g. ACUSON AcuNav ICE catheter family, Siemens Healthineers) based on multiple tendon-sheath mechanism (TSM). To motorize the existing TSM-based ICE catheter, the actuators interface with the outer handle knobs to manip- ulate four internal tendons. However, in practice, the actua- tors are located at a sterile, safe place far away from the ICE handle [3]. Thus, to interface with knobs, there exist multi- ple coupled gear structures between two, leading to a highly nonlinear behavior (e.g. various slack, elasticity) alongside hysteresis phenomena in TSM [2]. Since ICE catheters are designed for single use, the expen- sive actuators need to be located in a safe place so as to be reusable. Moreover, these actuators should interface as di- rectly as possible with the tendons for accurate tip controls. In this paper, we introduce a separable ICE catheter robot with four tendon actuation: one part reusable and another disposable. Moreover, we propose a practical model and cal- ibration method for our proposed mechanism so that four tendons are actuated simultaneously allowing for precise tip control and mitigating issues with conventional devices such as dead-zone and hysteresis with simple linear compensa- tion. We consider an open-loop controller since many avail- able ICE catheters are used without position-tracking sen- sors at the tip due to costs and single use.