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Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Transient heat flux"

1

Martins, N., H. Calisto, N. Afgan, and A. I. Leontiev. "The transient transpiration heat flux meter." Applied Thermal Engineering 26, no. 14-15 (October 2006): 1552–55. http://dx.doi.org/10.1016/j.applthermaleng.2005.11.027.

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2

Alkidas, A. C., and R. M. Cole. "Transient Heat Flux Measurements in a Divided-Chamber Diesel Engine." Journal of Heat Transfer 107, no. 2 (May 1, 1985): 439–44. http://dx.doi.org/10.1115/1.3247434.

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Transient surface heat flux measurements were performed at several locations on the cylinder head of a divided-chamber diesel engine. The local heat flux histories were found to be significantly different. These differences are attributed to the spatial nonuniformity of the fluid motion and combustion. Both local time-averaged and local peak heat fluxes decreased with decreasing speed and load. Retarding the combustion timing beyond TDC decreased the peak heat flux in the antechamber but increased the peak heat flux in the main chamber. This is attributed to the relative increase in the portion of fuel that burns in the main chamber with retarded combustion timing.
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3

Narayana, Supradeep, Salvatore Savo, and Yuki Sato. "Transient heat flux shielding using thermal metamaterials." Applied Physics Letters 102, no. 20 (May 20, 2013): 201904. http://dx.doi.org/10.1063/1.4807744.

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4

Chang, S. H., K. W. Lee, and D. C. Groeneveld. "Transient-Effects modeling of critical heat flux." Nuclear Engineering and Design 113, no. 1 (April 1989): 51–57. http://dx.doi.org/10.1016/0029-5493(89)90295-1.

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5

Buttsworth, D. R. "Transient response of an erodable heat flux gauge using finite element analysis." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 216, no. 8 (August 1, 2002): 701–6. http://dx.doi.org/10.1177/095440700221600808.

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The transient response of an erodable ribbon element heat flux gauge has been assessed using a two-dimensional finite element (FE) analysis. Such transient heat flux gauges have previously been used for measurements in internal combustion (IC) engines. To identify the heat flux from the measurements of surface temperature, it is commonly assumed that the heat transfer within these devices is one-dimensional. A corollary of the one-dimensional treatment is that only one value of the thermal product, , is needed for identification of the transient heat flux, even though erodable heat flux gauges are constructed from at least two different materials. The current results demonstrate that two-dimensional transient heat conduction effects have a significant influence on the surface temperature measurements made with these devices. For the ribbon element gauge and timescales of interest in IC engine studies, using a one-dimensional analysis (and hence a single value of ) will lead to substantial inaccuracy in the derived heat flux measurements.
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6

Fan, Chao, Yanqiang Bi, Jing Wang, Guoqing Liu, and Zhihai Xiang. "Experimental Investigation of Heat Flux Characteristics on the Thermally Induced Vibration of a Slender Thin-Walled Beam." International Journal of Applied Mechanics 12, no. 05 (June 2020): 2050053. http://dx.doi.org/10.1142/s1758825120500532.

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The spacecraft with large flexible space structures may be subject to the thermally induced vibration (TIV) due to the rapidly changed solar heat flux when it enters and leaves the eclipse, which would lead to certain spacecraft failure. This paper reports a laboratory experiment that aims to study the impact of transient characteristics of heat flux on the ground experiment of TIV. In the experiments on the TIV of a slender thin-walled beam, two different methods of providing transient heat flux were considered, and the process of entering and leaving eclipse was simulated, respectively. The experimental results demonstrate that different transient characteristics of heat flux will have large impact on the TIV of the specimen, and the ideal theoretical estimation of thermal characteristic time has limitations in practical engineering. In addition, it is found that the traditional way of simulating solar heat flux by turning on/off infrared heat lamps is not suitable for the TIV ground experiment. Instead, a transient heat flux simulation method by moving the baffle is recommended.
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7

Zarko, V. E. "Mathematical simulation of transient combustion of melted energetic materials." Chemical Bulletin of Kazakh National University, no. 3 (September 30, 2019): 4–10. http://dx.doi.org/10.15328/cb1079.

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The computer code is elaborated for numerical simulation of transient combustion of energetic materials (EM) subjected to the action of time-dependent heat flux and under transient pressure conditions. It allows studying combustion response upon interrupted irradiation (transient pressure) and under action of periodically varied heat flux (pressure) in order to determine stability of ignition transients and parameters of transient combustion. The originally solid EM melts and then evaporates at the surface. It is assumed that chemical transformations occur both in the condensed and gas phases. At the burning surface, the phase transition condition in the form of Clapeyron-Clausius law for equilibrium evaporation is formulated that corresponds to the case of combustion of sublimated or melted EM. The paper contains description of transient combustion problem formulation and several examples of transient combustion modeling. At present time a precise prediction of transient burning rate characteristics is impossible because of the lack of information about magnitude of EM parameters at high temperatures. However, the simulation results bring valuable qualitative information about burning rate behavior at variations in time of external conditions – radiant flux and pressure.
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8

Tenzer, Fabian M., Ilia V. Roisman, and Cameron Tropea. "Fast transient spray cooling of a hot thick target." Journal of Fluid Mechanics 881 (October 24, 2019): 84–103. http://dx.doi.org/10.1017/jfm.2019.743.

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Spray cooling of a hot target is characterized by strong heat flux and fast change of the temperature of the wall interface. The heat flux during spray cooling is determined by the instantaneous substrate temperature, which is illustrated by boiling curves. The variation of the heat flux is especially notable during different thermodynamic regimes: film, transitional and nucleate boiling. In this study transient boiling curves are obtained by measurement of the local and instantaneous heat flux produced by sprays of variable mass flux, drop diameter and impact velocity. These spray parameters are accurately characterized using a phase Doppler instrument and a patternator. The hydrodynamic phenomena of spray impact during various thermodynamic regimes are observed using a high-speed video system. A theoretical model has been developed for heat conduction in the thin expanding thermal boundary layer in the substrate. The theory is able to predict the evolution of the target temperature in time in the film boiling regime. Moreover, a remote asymptotic solution for the heat flux during the fully developed nucleate boiling regime is developed. The theoretical predictions agree very well with the experimental data for a wide range of impact parameters.
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9

Nakamura, Yuji, Katsuya Fukuda, Qiusheng Liu, Makoto Shibahara, and Koichi Hata. "Transient Critical Heat Flux in Vertical Small Tube." Proceedings of Conference of Kansai Branch 2018.93 (2018): 803. http://dx.doi.org/10.1299/jsmekansai.2018.93.803.

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10

Kulish, V. V., and J. L. Lage. "Fractional-Diffusion Solutions for Transient Local Temperature and Heat Flux." Journal of Heat Transfer 122, no. 2 (December 9, 1999): 372–76. http://dx.doi.org/10.1115/1.521474.

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Applying properties of the Laplace transform, the transient heat diffusion equation can be transformed into a fractional (extraordinary) differential equation. This equation can then be modified, using the Fourier Law, into a unique expression relating the local value of the time-varying temperature (or heat flux) and the corresponding transient heat flux (or temperature). We demonstrate that the transformation into a fractional equation requires the assumption of unidirectional heat transport through a semi-infinite domain. Even considering this limitation, the transformed equation leads to a very simple relation between local time-varying temperature and heat flux. When applied along the boundary of the domain, the analytical expression determines the local time-variation of surface temperature (or heat flux) without having to solve the diffusion equation within the entire domain. The simplicity of the solution procedure, together with some introductory concepts of fractional derivatives, is highlighted considering some transient heat transfer problems with known analytical solutions. [S0022-1481(00)01002-1]
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Дисертації з теми "Transient heat flux"

1

Calisto, Hugo Miguel Filipe. "Transient transpiration radiometer : development of a heat flux sensor for high aggressivity environments." Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12457.

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Doutoramento em Engenharia Mecânica
The development of a new instrument for the measurement of convective and radiative is proposed, based on the transient operation of a transpiration radiometer. Current transpiration radiometers rely on steady state temperature measurements in a porous element crossed by a know gas mass flow. As a consequence of the porous sensing element’s intrinsically high thermal inertia, the instrument’s time constant is in the order of several seconds. The proposed instrument preserves established advantages of transpiration radiometers while incorporating additional features that broaden its applicability range. The most important developments are a significant reduction of the instrument’s response time and the possibility of separating and measuring the convective and radiative components of the heat flux. These objectives are achieved through the analysis of the instrument’s transient response, a pulsed gas flow being used to induce the transient behavior.
Propõe-se o desenvolvimento de um novo instrumento para medição de fluxos de calor convectivos e radiativos, baseado na operação de um radiómetro de transpiração em regime transitório. Os radiómetros de transpiração atuais baseiam-se em medições de temperatura em regime estacionário num elemento poroso atravessado por um caudal mássico gasoso conhecido. Como consequência da inércia térmica intrinsecamente elevada do elemento sensível poroso, a constante de tempo do instrumento é da ordem dos segundos. O instrumento proposto preservará as vantagens estabelecidas dos radiómetros de transpiração incorporando características adicionais que alargarão a gama de aplicabilidade. As novas características mais importantes serão uma redução significativa do tempo de resposta do instrumento e a possibilidade de medir separadamente as componentes radiativa e convectiva do fluxo de calor. Estes objetivos serão conseguidos através da análise da resposta transitória do instrumento, utilizando-se um caudal pulsado de gás para induzir o comportamento transitório.
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2

Henderson, Alistair. "Predicting Ignition Time Under Transient Heat Flux Using Results from Constant Flux Experiments." University of Canterbury. Civil Engineering, 1998. http://hdl.handle.net/10092/8273.

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This project investigated if ignition could be mathematically predicted when a material is subjected to a transient heat flux. Six timbers commonly used in New Zealand for construction and indoor furnishing timbers were tested in a cone calorimeter at the University of Canterbury. The experiments were run at 50, 35, 20 and 15 kW/m2 incident heat flux. The sample surface temperature and heat release data was collected for each test. From the ignition time data a value for thermal inertia was calculated and using specific heat data from the literature the thermal properties of each material was inserted into a One Dimensional Heat Transfer Model. A second series of tests were conducted on each of the materials tested at constant flux. These new tests involved subjecting the sample to a transient heat flux based on t² fire growth curves. Again surface temperature and heat release data was obtained from the tests. The one dimensional heat transfer model was used to attempt to predict the surface temperature profile and the ignition time when the test conditions were entered into it. It was found that the predicted surface temperature profile generally matched the shape of the measured temperature profile. However the model was unsuccessful in accurately predicting the ignition time in either the constant or transient flux conditions. It is considered that accurate values for the thermal conductivity and the specific heat would be required before the ignition time and temperature profile could be accurately modelled.
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3

D'Elia, Christopher. "Development of Local Transient Heat Flux Measurements in an Axisymmetric Hybrid Rocket Nozzle." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1349.

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A method of performing local transient heat flux measurements in an uncooled axisymmetric hybrid rocket nozzle is presented. Surface temperatures are collected at various axial locations during short duration tests and post processed using finite difference techniques to determine local transient heat fluxes and film coefficients. Comparisons are made between the collected data and the complete Bartz model. Although strong agreement is observed in certain sections of the nozzle, ideal steady state conditions are not observed to entirely validate the Bartz model for hybrid rocket nozzles. An experimental error analysis indicates the experimental heat fluxes are accurate within ±5.2% and supports the accuracy of the results.
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4

Peabody, Hume L. "Evaluation of a Heat Flux Microsensor in a Transonic Turbine Cascade." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35495.

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The effects of using an insert Heat Flux Microsensor (HFM) versus an HFM deposited directly on a turbine blade to measure heat flux in a transonic cascade are investigated. The HFM is a thin-film sensor, 6.35 mm (0.250") in diameter (for an insert gage, including the housing) which measures heat flux and surface temperature. The thermal time response of both gages was modeled using a 1-D, finite difference technique and a 2-D, finite element solver. The transient response of the directly deposited gage was also tested against insert gages using an unsteady shock wave in a bench test setup and using a laser of known output. The effects of physical gage offset from the blade surface were also investigated. The physical offset of an insert HFM near the stagnation point on the suction side of a turbine blade was intentionally varied and the average heat transfer coefficient measured. Turbulence grids were used to study how offset affects the heat transfer coefficient with freestream turbulence added to the flow. The time constant of the directly deposited gage was measured to be 856 ms compared to less than 30 ms for the insert gages. Model results predict less than 20 ms for both gages and rule out the anodization layer (used for electrical isolation of the directly deposited gage from the blade) as the cause for the directly deposited gage's much slower time response. Offsets of ± 0.254 mm (0.010") at the gage location with an estimated boundary layer thickness of 0.10 mm (0.004") produced a higher average heat transfer coefficient than the 0.000" offset case. Using an insert HFM resulted in a higher average heat transfer coefficient than using the directly deposited gage and reduced the effects of freestream turbulence. To accurately measure heat transfer coefficients and the effects of freestream turbulence, the disruption of the flow caused by a gage must be minimized. Depositing a gage directly on the blade minimizes the effects of offset, but the cause of the slow time response must first be resolved if high speed data is to be taken.
Master of Science
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5

Veloo, Peter Surendran. "Scale modeling of the transient behavior of heat flux in enclosure fires." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3484.

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Thesis (M.S.) -- University of Maryland, College Park, 2006.
Thesis research directed by: Dept. of Fire Protection Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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6

Kilic, Arif Nesimi 1963. "A multi-region transient erosion model for concrete with time-dependent surface heat flux." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290695.

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A multi-region, transient concrete ablation and decomposition model is developed. The model consists of four regions of concrete containing a thermally affected region, a dry (evaporated and chemically dehydrated) region, and a gas-free (decarboxylated) region with ablated concrete at the melt/concrete interface. Each region has an interface where the latent heat of local decomposition reactions is taken into account as heat sinks due to endothermic characteristics of the reactions. The time dependent temperature profiles, and depth and growth rate of the regions are evaluated by use of the heat balance integral method. Solutions are obtained for surface heat fluxes in forms of constant, e ⁻(λ)ᵗ, t⁻(λ) and -At to analyze various melt cooldown schemes. The erosion front progresses with a constant rate proportional to the surface heat flux in case of constant heat flux, and terminates at a finite erosion depth that is logarithmically proportional to the cooldown rate for surface heat flux in forms of ⁻(λ)ᵗ and t⁻(λ). Sensitivity analyses are performed to investigate the effects of important thermophysical parameters. Larger erosion depth and rate is observed for higher thermal conductivity. Decomposition temperatures are found to be significant in ablation. Model results were compared with previous experiments and models, and determined to be valid and accurate for different types of melt/concrete interaction. The model presented in this study is simple yet very detailed and accurate in simulating the actual molten core/concrete interaction (MCCI) phenomena, and in investigating the concrete reaction to the molten core. It not only can be embodied into the MCCI codes currently being developed, but also can be used to determine the containment integrity, and fission products released into the environment and to the public as a stand alone code.
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7

Bezuidenhout, Johannes Jurie. "Convective heat flux determination using surface temperature history measurements and an inverse calculation method." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35706.

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Effective gages to measure skin friction and heat transfer have been established over decades. One of the most important criteria in designing such a gage is the physical size of the gage to minimise the interference of the flow, as well as the mass of these devices. The combined measurement of skin friction and heat flux using one single gage on the other hand, present unique opportunities and with it, unique technical problems.

The objective of this study is therefore to develop a cost-effective single gage that can be used to measure both skin friction and heat flux. The method proposed in this study is to install a coaxial thermocouple into an existing skin friction gage to measure the unsteady temperature on the surface of the gage. By using the temperature history and a computer program the heat flux through the surface can be obtained through an iterative guessing method. To ensure that the heat flux through the gage is similar to the heat flux through the rest of the surface, the gage is manufactured of a material very similar to the rest of the surface.

Walker developed a computer program capable of predicting the heat flux through a surface from the measured surface temperature history. The program is based on an inverse approach to calculate the heat flux through the surface. The biggest advantages of this method are its stability and the small amount of noise induced into the system. The drawback of the method is that it is limited to semi-infinite objects. For surfaces with a finite thickness, a second thermocouple was installed into the system some distance below the first thermocouple. By modifying the computer program these two unsteady temperatures can be used to predict the heat flux through a surface of finite thickness.

As part of this study, the effect of noise induced by the Cook-Felderman technique, found in the literature were investigated in detail and it was concluded that the method proposed in this study is superior to this Cook-Felderman method. Heat flux measurements compared well with measurements recorded with heat flux gages. In all cases evaluated the difference was less than 20%. It can therefore be concluded that heat flux gages on their own can measure surface heat flux very accurately. These gages are however too large to install in a skin-friction gage. The method introduced in this study is noisier than the heat flux gages on their own, but the size which is very important, is magnitudes smaller when using a coaxial thermocouple, to measure the surface temperature history.
Master of Science

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8

Kang, Yong Tae. "Experimental investigation of critical heat flux in transient boiling systems with vertical thin rectangular parallel plate channels /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1244826053.

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9

Hernandez-Ontiveros, Cesar F. "Numerical analysis of heat transfer during jet impingement on curved surfaces." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002123.

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10

Elsheikh, Mutasim Mohamed Sarour. "Numerical Simulations of Heat Transfer Processes in a Dehumidifying Wavy Fin and a Confined Liquid Jet Impingement on Various Surfaces." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3090.

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This thesis consists of two different research problems. In the first one, the heat transfer characteristic of wavy fin assembly with dehumidification is carried out. In general, fin tube heat exchangers are employed in a wide variety of engineering applications, such as cooling coils for air conditioning, air pre-heaters in power plants and for heat dissipation from engine coolants in automobile radiators. In these heat exchangers, a heat transfer fluid such as water, oil, or refrigerant, flows through a parallel tube bank, while a second heat transfer fluid, such as air, is directed across the tubes. Since the principal resistance is much greater on the air side than on the tube side, enhanced surfaces in the form of wavy fins are used in air-cooled heat exchangers to improve the overall heat transfer performance. In heating, ventilation, and air conditioning systems (HVAC), the air stream is cooled and dehumidified as it passes through the cooling coils, circulating the refrigerant. Heat and mass transfer take place when the coil surface temperature in most cooling coils is below the dew point temperature of the air being cooled. This thesis presents a simplified analysis of combined heat and mass transfer in wavy-finned cooling coils by considering condensing water film resistance for a fully wet fin in dehumidifier coil operation during air condition. The effects of variation of the cold fluid temperature (-5˚C - 5˚C), air side temperature (25˚C - 35˚C), and relative humidity (50% - 70%) on the dimensionless temperature distribution and the augmentation factor are investigated and compared with those under dry conditions. In addition, comparison of the wavy fin with straight radial or rectangular fin under the same conditions were investigated and the results show that the wavy fin has better heat dissipation because of the greater area. The results demonstrate that the overall fin efficiency is dependent on the relative humidity of the surrounding air and the total surface area of the fin. In addition, the findings of the present work are in good agreement with experimental data. The second problem investigated is the heat transfer analysis of confined liquid jet impingement on various surfaces. The objective of this computational study is to characterize the convective heat transfer of a confined liquid jet impinging on a curved surface of a solid body, while the body is being supplied with a uniform heat flux at its opposite flat surface. Both convex and concave configurations of the curved surface are investigated. The confinement plate has the same shape as the curved surface. Calculations were done for various solid materials, namely copper, aluminum, Constantan, and silicon; at two-dimensional jet. For this research, Reynolds numbers ranging from 750 to 2000 for various nozzle widths channel spacing, radii of curvature, and base thicknesses of the solid body, were used. Results are presented in terms of dimensionless solid-fluid interface temperature, heat transfer coefficient, and local and average Nusselt numbers. The increments of Reynolds numbers increase local Nusselt numbers over the entire solid-fluid interface. Decreasing the nozzle width, channel spacing, plate thickness or curved surface radius of curvature all enhanced the local Nusselt number. Results show that a convex surface is more effective compared to a flat or concave surface. Numerical simulation results are validated by comparing them with experimental data for flat and concave surfaces.
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Книги з теми "Transient heat flux"

1

Siegel, Robert. Two-flux Green's function analysis for transient spectral radiation in a composite. Reston, VA: American Institute of Aeronautics and Astronautics, 1996.

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Siegel, Robert. Two-flux Green's function analysis for transient spectral radiation in a composite. Reston, VA: American Institute of Aeronautics and Astronautics, 1996.

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Siegel, Robert. Two-flux Green's function analysis for transient spectral radiation in a composite. Reston, VA: American Institute of Aeronautics and Astronautics, 1996.

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4

Siegel, Robert. Two-flux and Green's function method for transient radiative transfer in a semitransparent layer. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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5

Siegel, Robert. Two-flux and Green's function method for transient radiative transfer in a semitransparent layer. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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6

Siegel, Robert. Two-flux and Green's function method for transient radiative transfer in a semitransparent layer. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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7

Heidmann, James D. Determination of a transient heat transfer property of acrylic using thermochromic liquid crystals. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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8

United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., ed. Measurement of local high-level, transient surface heat flux. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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9

United States. National Aeronautics and Space Administration., ed. Two-flux Green's function analysis for transient spectral radiation in a composite. Reston, VA: American Institute of Aeronautics and Astronautics, 1996.

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10

Two-flux and Green's function method for transient radiative transfer in a semitransparent layer. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Частини книг з теми "Transient heat flux"

1

Sapozhnikov, Sergey Z., Vladimir Yu Mityakov, and Andrey V. Mityakov. "Transient Heat Flux Measurements." In Heatmetry, 39–58. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40854-1_3.

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2

Wiśniewski, Tomasz S. "Transient Heat Conduction in Semi-infinite Solid with Specified Surface Heat Flux." In Encyclopedia of Thermal Stresses, 6164–71. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_413.

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3

Gollamudi, Siddhartha, and Pradeep S. Jakkareddy. "An Inverse Technique to Estimate the Heat Flux of a Slab with Transient Heat Conduction." In Lecture Notes in Mechanical Engineering, 1335–46. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-2794-1_113.

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4

Giventer, L. L., and J. L. Smith. "Transient Pool Boiling of Liquid Nitrogen Due to a Square-Wave Heat Flux." In Advances in Cryogenic Engineering, 259–70. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-0513-3_31.

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5

Hegde, Ramakrishna N., Shrikantha S. Rao, and R. P. Reddy. "Flow Visualization, Critical Heat Flux Enhancement, and Transient Characteristics in Pool Boiling Using Nanofluids." In Nanofluids, 42–63. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp156720120003.

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6

Prajapati, Ravi, Viral Thakkar, Sanil Shah, and Ajit Kumar Parwani. "Estimation of Transient Boundary Heat Flux Using Modified JAYA Algorithm in Laminar Duct Flow." In Recent Advances in Mechanical Infrastructure, 331–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4176-0_29.

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7

Sathavara, Parth, Ajit Kumar Parwani, Maulik Panchal, and Paritosh Chaudhuri. "Estimation of Boundary Heat Flux with Conjugate Gradient Method by Experimental Transient Temperature Data." In Recent Advances in Mechanical Infrastructure, 343–52. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4176-0_30.

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8

Sachdeva, Manish, and Laltu Chandra. "Transient Heat Transfer Analysis in Insulated Pipe with Constant and Time-Dependent Heat Flux for Solar Convective Furnace." In Springer Proceedings in Energy, 235–49. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4576-9_22.

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9

Arslanoglu, Nurullah, and Abdulvahap Yigit. "Simulation of Radiation Heat Flux Effect in Buildings on Human Thermal Comfort Under Transient Conditions." In Lecture Notes in Civil Engineering, 331–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-63709-9_26.

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10

Manjhi, Sanjeev Kumar, Rakesh Kumar, and Digvijaysinh Barad. "Conduction-Based Standardization of K-Type Coaxial Thermocouple for Short-Duration Transient Heat Flux Measurement." In Advances in Mechanical Engineering, 699–707. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0124-1_63.

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Тези доповідей конференцій з теми "Transient heat flux"

1

Liebert, Curt H., and Donald H. Weikle. "Heat Flux Measurements." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-107.

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Анотація:
This paper discusses a new automated, computer controlled heat flux measurement facility. Continuous transient and steady-state surface heat flux values varying from about 0.3 to 6 MW/m2 over a temperature range of 100 to 1200 K can be obtained in the facility. An application of this facility is the development of heat flux gauges for continuous fast transient surface heat flux measurement on turbine blades operating in space shuttle main engine turbopumps. The facility is also useful for durability testing at fast temperature transients.
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2

Cooper, M. G., and A. J. P. Lloyd. "TRANSIENT LOCAL HEAT FLUX IN NUCLEATE BOILING." In International Heat Transfer Conference 3. Connecticut: Begellhouse, 2019. http://dx.doi.org/10.1615/ihtc3.1050.

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3

Wedekind, G. L., and B. L. Bhatt. "Frequency Response Characteristics of a Tube-Type Condenser with Time Varying Heat Flux and Two-Phase Pressure Drop." In International Symposium on Transient Convective Heat Transfer. New York: Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.160.

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4

Kurzawski, Andrew, and Ofodike A. Ezekoye. "Inversion for Fire Heat Release Rate Using Transient Heat Flux Data." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5107.

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The heat-release rate (HRR) of a burning item is key to understanding the thermal effects of a fire on its surroundings. It is, perhaps, the most important variable used to characterize a burning fuel packet and is defined as the rate of energy released by the fire. HRR is typically determined using a gas measurement calorimetry method. In this study, an inversion algorithm is presented for conducting calorimeter on fires with unknown HRRs located in a compartment. The algorithm compares predictions of a forward model with observed heat fluxes from synthetically generated data sets to determine the HRR that minimizes a cost function. The effects of tuning a weighting parameter in the cost function and the issues associated with two different forward models of a compartment fire are examined.
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5

Harris, Simon D., Derek B. Ingham, and Ioan Pop. "Transient Response of a Steady Vertical Flow which is Subjected to a Change in Surface Heat Flux in Porous Media." In International Symposium on Transient Convective Heat Transfer. New York: Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.500.

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6

Orlande, Helcio, and Humberto Araujo Machado. "ESTIMATION OF THE TIMEWISE AND SPACEWISE VARIATION OF THE WALL HEAT FLUX TO A NON-NEWTONIAN FLUID IN A PARALLEL PLATE CHANNEL." In International Symposium on Transient Convective Heat Transfer. New York: Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.520.

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7

Bhoraniya, Rameshkumar, and Chandesh Sankhavara. "Transient Thermal Analysis of the High Heat Flux Component." In 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3777.

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8

Goswami, Rishikesh, Rakesh Kumar, and Tanweer Alam. "Two dimensional transient heat flux analysis through platinum plate." In 2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT). IEEE, 2016. http://dx.doi.org/10.1109/iceeot.2016.7755179.

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9

Li, Jing, Shuanshi Fan, Zemin Yao, Jing Li, and Xinli Wei. "Fast Transient and Intensified Heat Dissipation Applicable to High Heat Flux Density." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55408.

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In this paper, in order to solve the problem of intensified heat dissipation in high power electronic devices, a fast transient and intensified heat dissipation technology was put forward by comparing many heat transfer modes based on the analytical study on the existing technologies about heat dissipation at high heat flux density and about fast heat transport. This technology combined spray cooling technology with fast endothermic chemical reaction processes; we summarized the characteristics of media applicable to an environment with transient high heat flux density by comparing various parameters of many sprayed media in the spray cooling process. According to the energy balance of endothermic chemical reactions of relevant media, we determined the media (mainly carbon dioxide hydrate) applicable to the fast transient and intensified heat dissipation technology and presented the conditions for the chemical reactions. We analyzed the methods controlling the instantaneous chemical reaction rate and proposed the structural characteristics of the chemical reactor so as to ensure that the time for heat removal will be control to around 0.01 second. Thus, the problem of fast transient heat dissipation in high power electronic devices, etc. would be radically solved.
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10

Park, Jongdoc, Katsuya Fukuda, and Qiusheng Liu. "Critical heat flux phenomena depending on pre-pressurization in transient heat input." In PROCEEDING OF THE 3RD INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY 2016 (3RD IGNITE-2016): Advanced Materials for Innovative Technologies. Author(s), 2017. http://dx.doi.org/10.1063/1.4993399.

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