Relevant bibliographies by topics / Transient non-isothermal mode

Academic literature on the topic 'Transient non-isothermal mode'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Transient non-isothermal mode"

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Krause, Maike, Katharina Sessler, Anna Kaziales, Richard Grahl, Sabrina Noettger, Holger Barth, and Herbert Schmidt. "Variants of Escherichia coli Subtilase Cytotoxin Subunits Show Differences in Complex Formation In Vitro." Toxins 11, no. 12 (December 3, 2019): 703. http://dx.doi.org/10.3390/toxins11120703.

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The subtilase cytotoxin (SubAB) of Shiga toxin-producing Escherichia coli (STEC) is a member of the AB5 toxin family. In the current study, we analyzed the formation of active homo- and hetero-complexes of SubAB variants in vitro to characterize the mode of assembly of the subunits. Recombinant SubA1-His, SubB1-His, SubA2-2-His, and SubB2-2-His subunits, and His-tag-free SubA2-2 were separately expressed, purified, and biochemically characterized by circular dichroism (CD) spectroscopy, size-exclusion chromatography (SEC), and analytical ultracentrifugation (aUC). To confirm their biological activity, cytotoxicity assays were performed with HeLa cells. The formation of AB5 complexes was investigated with aUC and isothermal titration calorimetry (ITC). Binding of SubAB2-2-His to HeLa cells was characterized with flow cytometry (FACS). Cytotoxicity experiments revealed that the analyzed recombinant subtilase subunits were biochemically functional and capable of intoxicating HeLa cells. Inhibition of cytotoxicity by Brefeldin A demonstrated that the cleavage is specific. All His-tagged subunits, as well as the non-tagged SubA2-2 subunit, showed the expected secondary structural compositions and oligomerization. Whereas SubAB1-His complexes could be reconstituted in solution, and revealed a Kd value of 3.9 ± 0.8 μmol/L in the lower micromolar range, only transient interactions were observed for the subunits of SubAB2-2-His in solution, which did not result in any binding constant when analyzed with ITC. Additional studies on the binding characteristics of SubAB2-2-His on HeLa cells revealed that the formation of transient complexes improved binding to the target cells. Conclusively, we hypothesize that SubAB variants exhibit different characteristics in their binding behavior to their target cells.
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Patisson, Fabrice, Magda Galant François, and Denis Ablitzer. "A non-isothermal, non-equimolar transient kinetic model for gas-solid reactions." Chemical Engineering Science 53, no. 4 (February 1998): 697–708. http://dx.doi.org/10.1016/s0009-2509(97)00333-3.

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Shah, A. A., G. S. Kim, P. C. Sui, and D. Harvey. "Transient non-isothermal model of a polymer electrolyte fuel cell." Journal of Power Sources 163, no. 2 (January 2007): 793–806. http://dx.doi.org/10.1016/j.jpowsour.2006.09.022.

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Ziabicki, Andrzej, Beata Misztal-Faraj, and Leszek Jarecki. "Kinetic model of non-isothermal crystal nucleation with transient and athermal effects." Journal of Materials Science 51, no. 19 (June 28, 2016): 8935–52. http://dx.doi.org/10.1007/s10853-016-0145-8.

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Gonçalves, Willer P., Danmer M. Quinones, Abelardo B. Barreto, and Marcio S. Carvalho. "Petroleum reservoir parameters estimation using non-isothermal transient model and optimization methods." Journal of Petroleum Science and Engineering 212 (May 2022): 110269. http://dx.doi.org/10.1016/j.petrol.2022.110269.

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Bharath, S., B. C. Nakra, and K. N. Gupta. "Mathematical Model of a Railway Pneumatic Brake System With Varying Cylinder Capacity Effects." Journal of Dynamic Systems, Measurement, and Control 112, no. 3 (September 1, 1990): 456–62. http://dx.doi.org/10.1115/1.2896164.

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Governing equations for the analysis of pressure transient are derived from the principle of conservation of mass and momentum for a pneumatic brake system, which consists of a train pipe connected to a number of linear actuators (brake cylinders with piston displacement). The governing one-dimensional non-linear partial differential equations for the train pipe, non-linear ordinary differential equations for the brake cylinders, and second-order differential equation of motion for piston displacement are solved to determine the pressure transients in the brake system for a step change in pressure at the inlet. The governing equations are nondimensionalized and reduced to a set of ordinary nonlinear differential difference equations and integrated by standard numerical methods. The flow is considered isothermal, and the friction effects for turbulent and laminar flow are evaluated by quasi-steady state approximation. The auxiliary reservoir volume effect is also included. The results are compared with the experimental data obtained on a brake test rig.
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Poudyal, Hari, Suma R. Das, and Abhilash J. Chandy. "NON-ISOTHERMAL EFFECTS IN PARTIALLY FILLED RUBBER MIXING SIMULATIONS OF MANUFACTURING PROCESSES." Rubber Chemistry and Technology 92, no. 1 (January 1, 2019): 152–67. http://dx.doi.org/10.5254/rct.19.82590.

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ABSTRACT A finite volume technique is used to analyze the isothermal and non-isothermal flow behavior for the rubber mixing process in a two-dimensional, partially filled (75%) internal mixer, which consists of two counterrotating rotors rotating at 20 rpm. In order to capture the interface between air and rubber, an Eulerian multiphase model called volume of fluid (VOF) has been employed here. The transient flow behavior was accomplished by a sliding mesh technique, and the highly viscous, non-Newtonian properties of the rubber have been characterized using the Bird–Carreau model. Most of the previous computational fluid dynamic (CFD)-based investigations of rubber mixing assumed isothermal flow, and consequently negligible viscous heat generation, temperature rise, and viscosity drop associated with heat generation. Hence, a non-isothermal simulation is carried out, and results are compared with those of an equivalent isothermal simulation. In addition, dispersive and distributive mixing characteristics are assessed using statistics calculated from particle tracks generated by a set of massless and neutral particles that have been injected in the simulation. For this purpose, quantities such as the cumulative distribution of maximum shear stress, length of stretch, and cluster distribution index are calculated and compared between isothermal and non-isothermal conditions. Results showed a significant difference between the isothermal and non-isothermal simulations, thus making the isothermal assumption critical. Also, the non-isothermal simulation predicted better mixing during the entire mixing cycle.
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Chu, Dandan, Xin Li, and Shu Zhang. "A non-isothermal transient model for a metal-free quinone–bromide flow battery." Electrochimica Acta 190 (February 2016): 434–45. http://dx.doi.org/10.1016/j.electacta.2015.12.128.

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Shabaniverki, Soheila, and Siamak Serajzadeh. "The kinetics of isothermal and non-isothermal recovery within cold-rolled aluminum alloy." Multidiscipline Modeling in Materials and Structures 11, no. 1 (June 8, 2015): 88–101. http://dx.doi.org/10.1108/mmms-12-2013-0072.

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Purpose – The purpose of this paper is to study the kinetics of static recovery in cold-rolled aluminum alloy under different heating rates. Design/methodology/approach – Deformation modeling was first performed to assess the distributions of plastic strain and stress within the deformed alloy. In the next stage, thermal analysis and the rate equation of static recovery were employed to determine the progress of static recovery under non-isothermal conditions. Accordingly, a thermal finite element analysis and the Runge-Kutta method were utilized to handle the transient heat conduction and the progress of static recovery. Finally, low temperature annealing heat treatments were conducted to verify the model predictions. Accordingly, the tensile tests were conducted to measure the yield stresses of cold-rolled plates subjected to the subsequent annealing treatment at different temperatures and durations. Findings – The results indicate that the employed algorithm can be used as an appropriate predictive tool for designing a low temperature heat treatment schedule to achieve the desired yield stress. Originality/value – The kinetics of non-isothermal recovery and resulting yield stress are well predicted under practical annealing conditions.
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Chen, Xing Long, Bin Jia, Yan Yin, and Qing Du. "Numerical Simulation of Transient Response of Inlet Relative Humidity for High Temperature PEM Fuel Cells with Material Properties." Advanced Materials Research 625 (December 2012): 226–29. http://dx.doi.org/10.4028/www.scientific.net/amr.625.226.

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High temperature proton exchange membrane fuel cells (HT-PEMFCs) have been drawing much attention due to their easy water management and other advantages. A three-dimensional non-isothermal transient model of HT-PEMFCs with phosphoric acid doped polybenzimidazole (PBI) membrane is developed in this study. The inlet relative humidity (RH) is considered for the membrane conductivity in the model. The effect of inlet RH on the transient response of the cell is discussed and the results show that the increase of inlet RH had positive effect on cell performance but negative effect on transient response.
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Dissertations / Theses on the topic "Transient non-isothermal mode"

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Гусарова, И. Г., and В. С. Рязанов. "Моделирование нестационарных режимов течения по участку негоризонтального трубопровода." Thesis, ХНЕУ, 2016. http://openarchive.nure.ua/handle/document/2288.

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В работе рассмотрена математическая модель и численный метод, позволяющие проводить моделирование нестационарных процессов течения газа в трубопроводе с учетом рельефа трассы. На их основе можно проводить управление в нештатных ситуациях и аварийных ситуациях, происходящих в газотранспортной системе, и которые позволяют вести расчет параметров газового потока с необходимой точностью и необходимым быстродействием.
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Conference papers on the topic "Transient non-isothermal mode"

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Ward, J., C. K. Tan, and R. J. Tucker. "Development of a Spectral Radiation Model to Predict the Transient Performance of a Metal Reheating Furnace." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11114.

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The use of computational fluid dynamics for simulation of combustion processes has made significant advances in recent years particularly for the design of individual burners and the prediction of pollutant formation and emission. However, the computational requirements of these models can still be too great for overall furnace thermal design purposes particularly if the transient performance is required. Thermal radiation is usually the dominant mode of heat transfer to the load or stock in industrial fuel-fired furnaces since the contribution of convection is relatively small. Thus prediction of the thermal performance of a furnace requires an accurate calculation of the complex radiation interchange between the surfaces and the combustion products. This can be achieved by the so-called Hottel zone method of radiation analysis and as a result this method has been applied to a wide range of industrial heating processes. The method sub-divides the non-isothermal furnace enclosure into a series of isothermal volume and surface zones and energy balances are then formulated and solved simultaneously for each zone. The computational demands are modest so that the process can be repeated successively throughout a period of furnace operation to simulate the transient behaviour of the system. However in these models all the surfaces are usually assumed to be grey and the radiation properties of the combustion products are normally represented by a mixture of grey and clear gases. These assumptions can lead to errors in the predictions, in applications such as the installation of high emissivity coatings on the furnace lining, where it is necessary to allow for the spectral variation in surface emissivity and the banded nature of the radiation properties of carbon dioxide and water vapour in the combustion gases. Consequently the proposed paper describes the development of “spectral” zone model, which takes these effects into account, to predict the transient performance of a furnace heating steel bars to a discharge temperature of 1200°C. The model also allows for broadening of the spectral bands with changes in the temperature of the combustion products. The work differs from that in previous papers on this type of model, which have been confined to steady-state simulations and do not allow for broadening. Finally the model is applied to investigate the effect of coating the refractory lining of the furnace with high emissivity materials.
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Shahnazari, M. R., and A. Abbassi. "Transient Numerical Simulation of Non-Isothermal Process of RTM." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45699.

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In this paper, based on a physical model the resin transfer moulding (RTM) of a non-isothermal process has been simulated. It is assumed that the flow in porous medium is under the Darcian regime. Also, the relationship between flow mean velocity in each section has been considered in terms of porosity. The governing equations including heat dispersion term are solved numerically. To verify the model results, the temperature profiles for two types of fibers have been calculated, and are compared with experimental results of other researchers. The results showed that, to optimize the better quality of production of composite materials, the importance of heat dispersion term can not be neglected.
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Nieckele, A. O., A. M. B. Braga, and L. F. A. Azevedo. "Transient Pig Motion Through Non-Isothermal Gas and Liquid Pipelines." In 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-175.

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Simulation of the dynamics of pigs moving through non-isothermal pipelines is presented. The differential mass, linear momentum and energy equations were numerically solved by a finite difference numerical scheme, for compressible flow through pipelines. The fluid flow equations were combined with an equation representing a force balance on the pig. Pressure forces developed due to flow through by-pass holes in the pig, pig acceleration and pig/pipe contact forces were considered. A stick/slip model was developed to account for the distinct friction regimes that prevail depending on whether the pig is stopped or in motion. An adaptive grid technique was employed to account for the moving pig. Heat losses to the ambient play an important role in the fluid temperature distribution. However, for the test cases conducted, the temperature variations caused virtually no effect on the pig dynamics.
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Yoo, Haneul, Johan Ko, Kyeongmin Oh, and Hyunchul Ju. "A three dimensional, transient, non-isothermal model of all-vanadium redox flow batteries." In 2014 5th International Renewable Energy Congress (IREC). IEEE, 2014. http://dx.doi.org/10.1109/irec.2014.6826945.

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Abbaspour, Mohammad, Kirby S. Chapman, and Ali Keshavarz. "Dynamic Modeling of Non-Isothermal Gas Pipeline Systems." In 2004 International Pipeline Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ipc2004-0081.

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Natural gas systems are becoming more and more complex as the usage of this energy source increase. Mathematical models are used to design, optimize, and operate increasingly complex natural gas pipeline systems. Researchers continue to develop unsteady mathematical models that focus on the unsteady nature of these systems. Many related design problems, however, could be solved using steady-state modeling. Several investigators have studied the problem of compressible fluid flow through pipelines and have developed various numerical schemes, which include the method of characteristics, finite element methods, and explicit and implicit finite difference methods. The choice partly depends on the individual requirements of the system under investigation. In this work, the fully implicit finite difference method was used to solve the continuity, momentum, energy, and equations of state for flow within a gas pipeline system. The particular solution method described in this paper does not neglect the inertia term in the conservation of momentum equation. It also considered the compressibility factor as a function of temperature and pressure, and the friction factor as a function of the Reynolds number. the fully implicit method representation of the equations offer the advantage of guaranteed stability for a large time step, which is very useful for the gas industry. The results show that the effect of treating the gas in a non-isothermal manner is extremely necessary for pipeline flow calculation accuracies, especially for rapid transient processes. The results indicate that the inertia term plays an important role in the gas flow analysis and cannot be neglected from the calculation.
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Roy, Arnab, Mustafa Fazil Serincan, Ugur Pasaogullari, Michael W. Renfro, and Baki M. Cetegen. "Transient Computational Analysis of Proton Exchange Membrane Fuel Cells During Load Change and Non-Isothermal Start-Up." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85172.

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An investigation of the transient performance characteristics of proton exchange membrane fuel cells (PEMFC) undergoing load change and during above freezing low-temperature start-ups are presented. A transient, non-isothermal, three dimensional, single phase computational fluid dynamics based model is developed to describe the transient processes of a PEMFC with conventional channels in co-flow configuration. The model equations are solved using a multi-domain approach incorporating water transport through membrane and multi-component species transport through porous diffusion layer. The dynamic response of the characteristic parameters such as membrane hydration, species concentration, cell voltage and temperature are simulated undergoing step changes in operating current density and also during start up and the results are discussed in detail. Accumulation of water in the polymer electrolyte seems to control the response time for load response and also start-up times along with the temperature of the cell. Steady state and transient simulations are compared. Steady state predictions are compared with benchmark experimental data from literature and the species concentration distributions were found to be in good agreement.
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Borg, Jennifer, Norman Platts, Peter Gill, Jonathan Mann, and Chris Currie. "Thermo-Mechanical Fatigue Crack Growth Testing." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21424.

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Abstract Laboratory data have indicated that light water reactor environments can significantly reduce the fatigue life and crack growth performance of austenitic stainless steels. These environmental effects have been codified into design procedures and documents such as NUREG/CR-6909 Rev 1 (fatigue life) and ASME code case N-809 (crack growth). However, there is considered to be significant conservatism in these methods when applied to plant relevant loadings. The Weighted K-Rate, WKR, method was initially developed by J. Emslie et.al (PVP2016-63497) to address the influence of waveform shape as one of the potential sources of the over-conservatism in code case N-809. This method was found to significantly reduce the over-conservatism associated with ASME code case N-809. However, this method was based solely on isothermal data, and was shown to also retain significant over-conservatism, especially for out-of-phase non-isothermal waveforms typical of many thermally induced loading transients. The WKR method was further evolved into the Weighted Temperature and K-rate (WTKR) method, by Currie et.al (PVP2019-93855), further updated by Mann et.al (PVP2020-21585), which partitions the damage across the loading cycle, under non-isothermal conditions, and has been shown to significantly reduce the perceived over-conservatism associated with ASME code case N-809 when applied to many plant-relevant loading waveforms. This paper describes work that was done to investigate the impact of non-isothermal temperature / loading waveforms, and forms the bulk of non-isothermal data from which the WTKR method was derived. The data presented in this paper indicate that for out-of-phase transient loading (typical of most thermally induced plant loadings), and simple isothermal loading at low temperatures and longer rise times, the WTKR method provides a more accurate prediction of fatigue crack growth rates than the application of ASME code case N-809.
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Figueiredo, Aline, Carina N. Sondermann, Rodrigo A. C. Patricio, Raphael Viggiano, Gustavo C. R. Bodstein, Felipe B. de F. Rachid, and Renan M. Baptista. "Leak Localization Algorithm Applied to Non-Isothermal Liquid Flow in Horizontal Pipelines." In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78094.

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In the oil industry liquid pipelines are very important for the transport of liquids, particularly in long offshore pipelines. The operation of these oil pipelines is susceptible to the occurrence of leaks in the system. Localizing a leak in a very long oil pipeline is an important piece of information that needs to be obtained before mitigating actions can be taken. These pipelines are usually subject to the temperature gradients that exist in the bottom of the ocean, and the resulting heat transfer process may lead to wax formation and deposition. The single-phase flow that occurs in this type of offshore pipeline that presents one leak point and suffers the effects of an external temperature gradient is numerically simulated in this paper. We consider a one-dimensional mathematical model that includes conservation equations of mass, momentum and energy, and its associated numerical method to calculate the transient liquid flow inside the pipeline. We are particularly interested in testing a leak localization model based upon the intersection of the hydraulic grade lines emanating from the pipeline ends under the influence of a non-zero temperature distribution. This paper proposes to compare the results for a non-isothermal flow with the corresponding isothermal flow to study the influence of the temperature distribution upon the leak localization strategy. The flow that develops along the entire pipeline, upstream and downstream of the leak, strongly affects the pressure gradient and has a significant influence on the location of the leak. Our numerical simulations show results that allow the model sensitivity to be studied by changing the leak magnitude, for a given leak position. From this analysis, we may observe how these parameters affect the pressure gradients along the pipeline that develop upstream and downstream of the leak and the model’s ability to predict the leak location.
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Li, C. T., and F. C. Lai. "Thermal Effects on Flow Injection Under Microgravity Condition." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24359.

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Abstract Numerical results for non-isothermal flow injection under microgravity condition are reported in this paper. The numerical method, which combines the finite element method with a predictor/corrector scheme, is used to determine the transient flow field. The effects of surface tension are also considered in this study. The numerical simulations have covered a wide range of the governing parameters (i.e., 1 ≤ Pe ≤ 50, 0 ≤ St ≤ 10, and Ca = 1 and ∞). From the results obtained, it shows that gravitation has an important effect on the development of the flow front and required injection pressure. Although the surface tension effects may be insignificant for isothermal flow injection at Ca > 10, the effects become more important for non-isothermal flow injection at a higher Peclet number.
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Remy, Benjamin, and Alain Degiovanni. "Alternative and Relevant Representation to Heat Transfer Coefficient for Modeling the Heat Transfer Between a Fluid and a Non-Isothermal Wall in Transient Regime." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23019.

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This paper deals with the relevant model that can be proposed for modeling the interfacial heat transfer between a fluid and a wall in the case of space and time varying thermal boundary conditions. Usually, for a constant and uniform heat transfer (unidirectional steady-state regime), the problem can be solved introducing a heat transfer coefficient h, uniform in space and constant in time that linearly links the surface heat flux and the temperature difference between the wall temperature Tw and an equivalent fluid temperature Tf. The problem we consider in this work concerns the heat transfer between a steady-state fluid flow and a wall submitted to a transient and non uniform thermal solicitations, as for instance a steady-state flow on a flat plate submitted to a transient and space reduced heat flux. We will show that the more interesting representation for describing the interfacial heat transfer is not to define as usually done a non-uniform and variable heat transfer coefficient h(x,t) because as it depends on the thermal boundary conditions, it is not really intrinsic. We propose an alternative approach, which consists in introducing a generalized impedance Z(ω,p) that links in space and time domain the heat flux and the temperature difference through a double convolution product instead of a scalar product. After the presentation of the general problem, the simple case of a stationary piston flow that can be solved analytically will be considered for validation both in thermal steady-state and transient regimes. To conclude and show the interest of our approach, a comparison between a global approach and a numerical simulation in a more complex and realistic case taking into account the thermal coupling with a flat plate will be presented.
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