Готові списки джерел за темами / Heat Conduction Measurement

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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Heat Conduction Measurement"

1

Tadi, M. "Inverse heat conduction based on boundary measurement." Inverse Problems 13, no. 6 (December 1, 1997): 1585–605. http://dx.doi.org/10.1088/0266-5611/13/6/012.

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2

Flach, G. P., and M. N. O¨zis¸ik. "Inverse Heat Conduction Problem of Periodically Contacting Surfaces." Journal of Heat Transfer 110, no. 4a (November 1, 1988): 821–29. http://dx.doi.org/10.1115/1.3250580.

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Анотація:
An inverse heat conduction method for determining the periodically time-varying contact conductance between two periodically contacting surfaces is presented. The technique is based on solving two single-region inverse problems for the contact surface temperature and heat flux of each solid. The time variation of contact surface temperature is represented with a versatile periodic B-spline basis. The dimension of the B-spline basis is statistically optimized and confidence bounds are derived for the estimated contact conductance. Typical results based on both simulated and actual measurements are given and a parametric study is made to illustrate the general effects of measurement location, number of measurements, etc., on the accuracy of the results.
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3

Inoue, Hirotsugu, and Kikuo Kishimoto. "OS10-1-4 Effect of heat conduction on stress measurement based on the thermoelastic effect." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007.6 (2007): _OS10–1–4——_OS10–1–4—. http://dx.doi.org/10.1299/jsmeatem.2007.6._os10-1-4-.

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4

Ikenson, Ben. "Advancing high-throughput heat conduction property characterization." Scilight 2022, no. 19 (May 13, 2022): 191103. http://dx.doi.org/10.1063/10.0011390.

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5

Gutierrez-Arroyo, A., C. Sanchez-Perez, and N. Aleman-Garcia. "Optical sensor for heat conduction measurement in biological tissue." Journal of Physics: Conference Series 450 (June 26, 2013): 012027. http://dx.doi.org/10.1088/1742-6596/450/1/012027.

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6

Oliveira, G. C., S. S. Ribeiroa, and G. Guimarães. "INVERSE PROBLEM OF A ONE-DIMENSIONAL MODEL IN MULTILAYER HEAT CONDUCTION." Revista de Engenharia Térmica 19, no. 1 (September 9, 2020): 42. http://dx.doi.org/10.5380/reterm.v19i1.76429.

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Анотація:
The inverse problem in conducting heat is related to the determination of the boundary condition, rate of heat generation, or thermophysical properties, using temperature measurements at one or more positions of the solid. The inverse problem in conducting heat is mathematically one of the ill-posed problems, because its solution extremely sensitive to measurement errors. For a well-placed problem the following conditions must be satisfied: the solution must exist, it must be unique and must be stable on small changes of the input data. The objective of the work is to estimate the heat flux generated at the tool-chip-chip interface in a manufacturing process. The term "estimation" is used because in the temperature measurements, errors are always present and these affect the accuracy of the calculation of the heat flow.
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7

Chan, Chia Yen, Bill Wang, Chien Pao Lin, Tom Hsiao, and Ting Ming Huang. "Thermal Conduction Measurement and Analysis for a Spaceborn Sensor." Key Engineering Materials 656-657 (July 2015): 741–46. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.741.

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The present study is aimed at investigating the thermal conduction characteristics of a spaceborn sensor experimentally and computationally. The experimental measurement has been carried out in a high vacuum chamber with twenty selected thermal couples attached to the sensor module. The detailed internal thermal control design, material for heat release, temperature limit, and control logic of the sensor assembly have been described in the study. The total thermal resistance for the sensor has been evaluated from the experimental results of the steady state temperature distributions under a heat power of 5.5 W and the sensor heater power modulation has been obtained to keep the PT1000 within the accepted temperature range. Under the assumed temperature boundary conditions, the measured thermal resistances and the modulated sensor heater power, the maximum PT1000 temperature distribution is found to be 25.26 °C ± 3.44 °C with the finite element analysis. Heat loss has been evaluated for the invar mount of the sensor module. In addition, the overall orbit peak and average heater powers needed are 4.61 W and 1.61 W respectively.
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8

Seibold, Florian, Andreas Schwab, Victor Dubois, Rico Poser, Bernhard Weigand, and Jens von Wolfersdorf. "Conduction and Inertia Correction for Transient Thermocouple Measurements. Part I: Analytical and Numerical Modelling." E3S Web of Conferences 345 (2022): 01002. http://dx.doi.org/10.1051/e3sconf/202234501002.

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Анотація:
Two-wire thermocouples are often used for temperature measurements. Under transient conditions, measurement errors can occur due to capacitive inertia and heat conduction along the stem of the thermocouples. The present study presents a correction of these thermocouple measurement errors caused by transient inertia and conductive effects using a simplified analytical approach and its numerical solution. Based on an energy balance the mathematical modelling is derived and analytically solved for specific boundary conditions. Further, numerical solutions have been implemented with different model complexities. Thereby the models show the significance of the necessary correction as well as the good agreement with theoretical considerations. A corresponding experimental validation is given in Part II.
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9

Machida, Kenji, Koichi Hayafune, and Shohei Miyagawa. "Influence of the Thickness and Frequency in the Infrared Hybrid Method in Consideration of Heat Conduction." Key Engineering Materials 345-346 (August 2007): 1287–90. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1287.

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The thickness dependency of the temperature image obtained by an infrared thermography was investigated using specimens with three kinds of metal materials of different heat conduction and four kinds of thickness of the specimens. Then, the infrared hybrid method was developed to separate each stress components. However, it contains the influence of heat conduction in the infrared stress measurement method. Therefore, heat conduction error will arise in the infrared hybrid analysis. Then, the new system which corrects the error by an heat conduction inverse analysis was developed. Thereby, the accuracy of the stress intensity factor was able to be raised using heat conduction inverse analysis. Furthermore, the accuracy of hybrid method taking heat conduction into consideration was discussed in comparison with 3-D finite-element analysis and the 2-D infrared hybrid method.
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10

Hensel, E., and R. G. Hills. "An Initial Value Approach to the Inverse Heat Conduction Problem." Journal of Heat Transfer 108, no. 2 (May 1, 1986): 248–56. http://dx.doi.org/10.1115/1.3246912.

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The one-dimensional linear inverse problem of heat conduction is considered. An initial value technique is developed which solves the inverse problem without need for iteration. Simultaneous estimates of the surface temperature and heat flux histories are obtained from measurements taken at a subsurface location. Past and future measurement times are inherently used in the analysis. The tradeoff that exists between resolution and variance of the estimates of the surface conditions is discussed quantitatively. A stabilizing matrix is introduced to the analysis, and its effect on the resolution and variance of the estimates is quantified. The technique is applied to “exact” and “noisy” numerically simulated experimental data. Results are presented which indicate the technique is capable of handling both exact and noisy data.
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Дисертації з теми "Heat Conduction Measurement"

1

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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2

Dugay, Murielle. "Errors in skin temperature measurements." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc9786/.

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Numerical simulation is used to investigate the accuracy of a direct-contact device for measuring skin-surface temperature. A variation of thermal conductivity of the foam has greater effect on the error rather than a variation of the blood perfusion rate. For a thermal conductivity of zero, an error of 1.5 oC in temperature was identified. For foam pad conductivities of 0.03 and 0.06 W/m-oC, the errors are 0.5 and 0.15 oC. For the transient study, with k=0 W/m-oC, it takes 4,900 seconds for the temperature to reach steady state compared with k=0.03 W/m-oC and k=0.06 W/m-oC where it takes 3,000 seconds. The configuration without the foam and in presence of an air gap between the skin surface and the sensor gives the most uniform temperature profile.
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3

Choi, Keum-Ran. "3D thermal mapping of cone calorimeter specimen and development of a heat flux mapping procedure utilizing an infrared camera." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-020205-215634/.

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Анотація:
Dissertation (Ph.D.)-- Worcester Polytechnic Institute.
Keywords: temperature measurement; heat flux maps; Cone Calorimeter; three-dimensional heat conduction; fire growth models; retainer frame; ceramic fiberboard; edge effect; one-dimensional heat conduction; heat flux mapping procedure; infrared camera; specimen preparation; edge frame; one-dimensional heat conduction model; thermal properties. Includes bibliographical references (p.202-204).
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4

Depoid, Christophe. "Couplage entre paroi semi-transparente et cavites d'air par conduction, convection et rayonnements : mesure des temperatures d'interface." Paris 6, 1988. http://www.theses.fr/1988PA066193.

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Le probleme etudie est celui des mesures de temperature a la surface de parois semi-transparentes: les capteurs utilises (thermocouples colles) introduisent des perturbations qui, dans le cas ou le niveau d'echange est bas, tel que celui de l'habitat, peuvent etre du meme ordre que les effets etudies. Ce travail, mene simultanement sur le plan experimental et numerique par calage de modeles, concerne donc la mesure de temperature de surface, ainsi que l'evaluation et l'interpretation des perturbations creees par les capteurs utilises. La methodologie repose sur l'analyse de situations caracterisees par des conditions aux limites en surface de complexite croissante: conduction et rayonnement infra-rouge, convection naturelle, puis rayonnement visible
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5

Cazin-Bourguignon, Anne-Marie. "Contribution a l'etude du bilan thermique du recepteur de la centrale themis." Paris 6, 1986. http://www.theses.fr/1986PA066218.

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Description du bilan energetique du recepteur solaire. Un modele numerique valide par des essais, permet d'evaluer les pertes conductives. D'autres essais permettent de chiffrer les pertes convectives selon la temperature de la paroi. Metrologie des phenomenes radiatifs
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6

Dougherty, Brian P. "An automated probe for thermal conductivity measurements." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101183.

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Анотація:
A transient technique was validated for making thermal conductivity measurements. The technique incorporated a small, effectively spherical, heat source and temperature sensing probe. The actual thermal conductivity measurements lasted 30 seconds. After approximately 15 minutes of data reduction, a value for thermal conductivity was obtained. The probe yielded local thermal conductivity measurements. Spherical sample volumes less than 8 cm² were required for the materials tested. Thermal conductivity (and moisture) distributions can be measured for relatively dry or wetted samples. The technique employs an encapsulated bead thermistor. A thermistor, more commonly used as a temperature transducer, has the inherent feature of being readily self-heated. A computer-based data acquisition and control system regulates the power supplied to the thermistor such that its self-heated temperature response approximates a step change. Thermal conductivity is deduced from the transient measurement of the power dissipated by the probe as a function of time. The technique was used to measure the thermal conductivity of fifteen liquids and five insulation materials. Two different thermistor types, glass-encapsulated and Teflon-encapsulated, were evaluated. Capabilities and limitations of each probe type and the measurement technique, in general, were observed.
M.S.
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7

Walker, Don Gregory Jr. "Estimation of Unsteady Nonuniform Heating Rates from Surface Temperature Measurements." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/40387.

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Shock wave interactions such as those that occur during atmospheric re-entry, can produce extreme thermal loads on aerospace structures. These interactions are reproduced experimentally in hypersonic wind tunnels to study how the flow structures relate to the deleterious heat fluxes. In these studies, localized fluid jets created by shock interactions impinge on a test cylinder, where the temperature due to the heat flux is measured. These measurements are used to estimate the heat flux on the surface as a result of the shock interactions. The nature of the incident flux usually involves dynamic transients and severe nonuniformities. Finding this boundary flux from discrete unsteady temperature measurements is characterized by instabilities in the solution. The purpose of this work is to evaluate existing methodologies for the determination of the unsteady heat flux and to introduce a new approach based on an inverse technique. The performance of these methods was measured first in terms of accuracy and their ability to handle inherently ``unstable'' or highly dynamic data such as step fluxes and high frequency oscillating fluxes. Then the method was expanded to estimate unsteady and nonuniform heat fluxes. The inverse methods proved to be the most accurate and stable of the methods examined, with the proposed method being preferable.
Ph. D.
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8

deMartin, Brian J. "Laboratory measurements of the thermal conductivity and thermal diffusivity of methane hydrate at simulated in situ conditions." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/26216.

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9

Ma, Luyao. "Optimization of experimental conditions of hot wire method in thermal conductivity measurements." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93765.

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This work studied the hot wire method in measuring thermal conductivity at room temperature. The purpose is to find the optimized experimental conditions to minimize natural convection in liquid for this method, which will be taken as reference for high temperature thermal conductivity measurement of slag. Combining room temperature experiments and simulation with COMSOL Multiphysics 4.2a, the study on different experimental parameters which may influence the accuracy of the measured thermal conductivity was conducted. The parameters studied were the diameter of crucible, the position of wire in the liquid, including z direction and x-y plane position, diameter of the hot wire, and current used in the measurement. In COMSOL simulations, the maximum natural convection velocity value was used to evaluate the natural convection in the liquid. The experiment results showed after 4~5 seconds of the measuring process, the natural convection already happened. Also when current was fixed, the thinner the hot wire, the larger convection it would cause. This is because thinner wire generates more heat per unit surface area. Using higher current in measuring, more heat generation improved accuracy of result but also had earlier and larger effect on convection. Both simulation and experiments showed that with the height of the liquid fixed, the smaller diameter of the crucible (not small to the level which is comparable with hot wire diameter), the higher the position in z direction (still covered by liquid), the less natural convection effect existed. But the difference was not significant. The radius-direction position change didn’t influence the result much as long as the wire was not too close to the wall.
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10

O'Dowd, Devin Owen. "Aero-thermal performance of transonic high-pressure turbine blade tips." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.

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Книги з теми "Heat Conduction Measurement"

1

Rabinovich, V. A. Viscosity and thermal conductivity of individual substances in the critical region. New York: Begell House, 1996.

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2

A, Wakeham W., Nagashima A. 1938-, Sengers J. V, and International Union of Pure and Applied Chemistry. Commission on Thermodynamics., eds. Measurement of the transport properties of fluids. Oxford [England]: Blackwell Scientific Publications, 1991.

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3

Roder, H. M. Experimental thermal conductivity values for mixtures of methane and ethane. [Washington, D.C.]: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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4

Roder, H. M. Experimental thermal conductivity values for mixtures of methane and ethane. [Washington, D.C.]: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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5

Thermal nanosystems and nanomaterials. Heidelberg [Germany]: Springer, 2009.

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6

R, Zarr Robert. International comparison of guarded hot plate apparatus using national and regional reference materials. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2002.

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7

Falconer, David A. Relative elemental abundance and heating constraints determined for the solar corona from SERTS measurements. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1994.

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8

Falconer, David A. Relative elemental abundance and heating constraints determined for the solar corona from SERTS measurements. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1994.

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9

Falcomer, David A. Relative elemental abundance and heating constraints determined for the solar corona from SERTS measurements. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1994.

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10

Volz, Sebastian. Thermal Nanosystems and Nanomaterials. Springer, 2012.

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Частини книг з теми "Heat Conduction Measurement"

1

Kuriyama, T., F. Kuriyama, M. Lewis, and R. Radebaugh. "Measurement of Heat Conduction through Stacked Screens." In Cryocoolers 9, 459–64. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5869-9_53.

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2

Lewis, M. A., and R. Radebaugh. "Measurement of Heat Conduction through Metal Spheres." In Cryocoolers 11, 419–25. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47112-4_53.

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3

Lewis, M. A., T. Kuriyama, F. Kuriyama, and R. Radebaugh. "Measurement of Heat Conduction through Stacked Screens." In Advances in Cryogenic Engineering, 1611–18. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9047-4_202.

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4

Lewis, M. A., and R. Radebaugh. "Measurement of Heat Conduction through Bonded Regenerator Matrix Materials." In Cryocoolers 12, 517–22. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_68.

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5

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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6

Jaeger, John C. "Application of the Theory Of Heat Conduction to Geothermal Measurements." In Terrestrial Heat Flow, 7–23. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm008p0007.

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7

Corsan, J. M. "Axial Heat Flow Methods of Thermal Conductivity Measurement for Good Conducting Materials." In Compendium of Thermophysical Property Measurement Methods, 3–31. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3286-6_1.

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8

Kamboj, Sangeeta, and Ratna Dahiya. "Development of System for GPS Data Transmission to Web Server for Online over Head Conductor Sag Measurement." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 437–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27299-8_46.

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9

Liu, Wei. "Measurement of Boundary Conditions - Surface Heat Flux and Surface Temperature." In Convection and Conduction Heat Transfer. InTech, 2011. http://dx.doi.org/10.5772/19565.

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10

Jradi, Rania, Ali Fguiri, Christophe Marvillet, and Mohamed Razak Jeday. "Tubular Heat Exchanger Fouling in Phosphoric Acid Concentration Process." In Inverse Heat Conduction and Heat Exchangers. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.88936.

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Fouling in phosphoric acid concentration is a persistent operational problem that compromises energy recovery in this process. Progress is hampered by the lack of quantitative knowledge of fouling dynamic effects on heat exchanger transfer. The object of this work is an experimental determination of the thermal fouling resistance in the tubular heat exchanger of phosphoric acid preheated installed in phosphoric acid concentration process. By measuring the inlet and outlet temperatures of phosphoric acid, steam temperature, suction and discharge pressure of the pump and acid density measurement, the overall heat transfer coefficient has been determined. The determination of the overall heat transfer coefficient with clean and fouled surfaces, allowed calculating the fouling resistance. The results from the heat exchanger studies showed that the fouling resistance increased with time and presented an asymptotic evolution in compliant with the proposed model by Kern and Seaton, with the existence of fluctuation. The poorly cleaned heat exchanger implied the absence of the induction period and caused, consequently, high values of the fouling resistance in a relatively short-time period.
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Тези доповідей конференцій з теми "Heat Conduction Measurement"

1

Canetta, Carlo, Ning Gu, and Arvind Narayanaswamy. "Ultrasensitive Bimaterial Cantilevers Optimized for Nanowire Heat Conduction Measurement." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75169.

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We have developed a microcantilever-based technique for measurement of heat conduction through individual nanowires. We fabricated silicon nitride cantilevers with nominal dimensions of length 100 μm, width 2–6 μm, and thickness 130 nm. Cantilever chips are designed with multiple cantilevers spaced at varying distances. With a reflective aluminum coating of optimized thickness, these bimaterial cantilevers can be used as ultrasensitive thermal sensors capable of measuring very small heat flux through a nanostructure fixed between two cantilevers. The ultrasensitive bimaterial cantilevers designed in this work are not limited to heat conduction measurements, but will also be useful for measuring near-field radiative heat transfer between a sphere, attached to the tip of the cantilever, and a flat plate.
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2

Zhang, X., G. Zhou, B. Dong, Q. Li, and L. Q. Liu. "Application of inverse heat conduction problem on temperature measurement." In TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY, VOLUME 8: Proceedings of the Ninth International Temperature Symposium. AIP, 2013. http://dx.doi.org/10.1063/1.4819532.

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3

Janicki, Marcin, Pawel Janus, Piotr Pietrzak, Piotr Zajac, Grzegorz Jablonski, Artur Sobczak, Jedrzej Topilko, and Andrzej Napieralski. "Measurement and Modeling of Heat Conduction in MEMS Nanostructures." In 2018 17th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2018. http://dx.doi.org/10.1109/itherm.2018.8419504.

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4

Lam, Cecilia S., Alexander L. Brown, Elizabeth J. Weckman, and Walter Gill. "Measurement of Heat Flux From Fires." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56896.

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Heat flux is an important parameter for characterization of the thermal impact of a fire on its surroundings. However, heat flux cannot be measured directly because it represents the rate of heat transfer to a unit area of surface. Therefore, most heat flux measurements are based on the measurement of temperature changes at or near the surface of interest [1,2]. Some instruments, such as the Gardon gauge [3] and the thermopile [2], measure the temperature difference between a surface and a heat sink. In radiation-dominated environments, this difference in temperature is often assumed to be linearly related to the incident heat flux. Other sensors measure a surface and/or interior temperature and inverse heat conduction methods frequently must be employed to calculate the corresponding heat flux [1,4]. Typical assumptions include one-dimensional conduction heat transfer and negligible heat loss from the surface. The thermal properties of the gauge materials must be known and, since these properties are functions of temperature, the problem often becomes non-linear.
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5

Eberth, John F., Jay Porter, Egidio E. Marotta, and Leroy S. Fletcher. "Integration of Heat Conduction Measurement Systems Into Engineering Technology Education." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81345.

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Modern engineering technology education necessitates realistic, cross disciplinary research projects. Maintaining these research opportunities within the university is an effective way for undergraduate students to practice their profession while assisting with graduate level research. In the heat conduction laboratory, the Mechanical Engineering Department at Texas A&M has joined with the Department of Engineering Technology and Industrial Distribution to create a novel learning environment beneficial to both students and professors. The goal of this project is to design and implement an improved thermal test chamber using mechatronic concepts. Similarly, the educational goal is to have engineering technology students apply their classroom based learning to a real-world application and to coordinate their efforts with a diverse background of advisors and engineers.
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6

Molavi, Hosein, Ali Hakkaki-Fard, Alireza Pourshaghaghy, Mehdi Molavi, and Ramin K. Rahmani. "Heat Flux Estimation in a Nonlinear Inverse Heat Conduction Problem With Moving Boundary." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88501.

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Estimation of heat flux in the nonlinear heat conduction problem becomes more challenging when the material at the boundary loses its mass due to phase change, chemical erosion, oxidation, or mechanical removal. In this paper, a new gradient-type method with adjoint problem is employed to predict the unknown time-varying heat flux at the receding surface in the nonlinear heat conduction problem. Particular features of this novel approach are discussed and examined. Results obtained by the new method for several test cases are benchmarked and analyzed using the numerical experiments with the simulated exact and noisy measurements. Exceedingly reliable estimation on the heat flux can be obtained from the knowledge of the transient temperature recordings, even in the case with measurement errors. In order to evaluate the performance characteristics of the present inverse scheme, simulations are conducted to analyze the effects of this technique with regard to conjugate gradient method with adjoint problem and variable metric method with adjoint problem. The obtained results show that the present inverse scheme distinguishably accelerates the convergence rate, which approve the well capability of the method for this type of heat conduction problems.
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7

Chen, W., H. Jiang, Q. Zhang, and L. He. "A Simple Corner Correction Technique for Transient Thermal Measurement." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26622.

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The 1D conduction analytical and semi-analytical approaches for a semi-infinite domain have been widely adopted in the data processing of transient thermal experiments. The convective heat transfer coefficient (HTC) calculated by the 1D approach contains large errors when lateral conduction effects are significant, especially near a corner of solid domain. The problems could be addressed by alternative full 3D numerical conduction analyses, which tend to be complex as well as requiring extra experimental efforts to obtain the full thermal boundary conditions around corners, in addition to an access to a 3D conduction solver (CFD or FEA). In the present work, a simple and effective method is developed to correct such errors in the near-corner region without using any commercial tool. The present approach is based on the recognition that a temperature time trace in a 2D situation is the result of the accumulated heat conductions from the normal and lateral directions respectively and summatively. An equivalent semi-infinite 1D conduction temperature trace for a correct HTC can be generated by reconstructing and removing the lateral conduction effect at each discrete time step. This simple new correction procedure enables the standard 1D conduction analysis to be properly used to get the correct HTC, completely analytically without needing any aid of CFD or FEA solutions. Two test cases of practical interest with turbine blade tip heat transfer and film cooling are used for validation and demonstration. It has been consistently shown that the errors of the conventional 1D conduction analysis in the near corner regions can be greatly reduced by the new corner correction method. The demonstrated validity, the simplicity and robustness of the present method makes it a good candidate for future applications in transient thermal experimental studies.
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8

Janicki, Marcin, Mariusz Zubert, Agnieszka Samson, Tomasz Raszkowski, and Andrzej Napieralski. "Green's function solution for dual-phase-lag heat conduction model in electronic nanostructures." In 2015 31st Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2015. http://dx.doi.org/10.1109/semi-therm.2015.7100146.

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9

Nakamura, Hajime. "Spatio-Temporal Measurement of Convective Heat Transfer for the Separated and Reattaching Flow." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22753.

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Spatio-temporal distribution of convective heat transfer behind a backward-facing step was measured in order to explore the dynamic behavior of the heat transfer caused by flow separation and reattachment. This measurement was achieved by using a high-speed infrared thermograph which measured temperature fluctuation on a thin foil heated electrically. The attenuation due to both the thermal inertia and the lateral conduction was restored by solving heat conduction equations inside the test surface. As a result, it was clarified that the heat transfer enhancement in the flow reattaching region had a spot-like feature. Each spot spread with time and overlapped others, forming a complex feature in the spatio-temporal characteristics of the heat transfer. The characteristic spanwise wavelength of this structure was approximately 1.2 times the step height for Reynolds number of 2000 ≤ ReH ≤ 5500, regardless of the step height. The characteristic frequency of the fluctuation in the reattaching region was St = 0.04–0.08 although there was no clear periodicity. This fluctuation is likely to be related to the low-frequency unsteadiness observed in the literature.
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BÄR, MARKUS, STEFFEN BAUER, REGINE MODEL, and RODRIGO WEBER DOS SANTOS. "MODELLING MEASUREMENT PROCESSES IN COMPLEX SYSTEMS WITH PARTIAL DIFFERENTIAL EQUATIONS: FROM HEAT CONDUCTION TO THE HEART." In Advanced Mathematical and Computational Tools in Metrology. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774187_0001.

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Звіти організацій з теми "Heat Conduction Measurement"

1

Nakos, James Thomas, Victor G. Figueroa, and Jill E. Murphy. Uncertainty analysis of heat flux measurements estimated using a one-dimensional, inverse heat-conduction program. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/921718.

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2

Treadwell, Jonathan R., James T. Reston, Benjamin Rouse, Joann Fontanarosa, Neha Patel, and Nikhil K. Mull. Automated-Entry Patient-Generated Health Data for Chronic Conditions: The Evidence on Health Outcomes. Agency for Healthcare Research and Quality (AHRQ), March 2021. http://dx.doi.org/10.23970/ahrqepctb38.

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Background. Automated-entry consumer devices that collect and transmit patient-generated health data (PGHD) are being evaluated as potential tools to aid in the management of chronic diseases. The need exists to evaluate the evidence regarding consumer PGHD technologies, particularly for devices that have not gone through Food and Drug Administration evaluation. Purpose. To summarize the research related to automated-entry consumer health technologies that provide PGHD for the prevention or management of 11 chronic diseases. Methods. The project scope was determined through discussions with Key Informants. We searched MEDLINE and EMBASE (via EMBASE.com), In-Process MEDLINE and PubMed unique content (via PubMed.gov), and the Cochrane Database of Systematic Reviews for systematic reviews or controlled trials. We also searched ClinicalTrials.gov for ongoing studies. We assessed risk of bias and extracted data on health outcomes, surrogate outcomes, usability, sustainability, cost-effectiveness outcomes (quantifying the tradeoffs between health effects and cost), process outcomes, and other characteristics related to PGHD technologies. For isolated effects on health outcomes, we classified the results in one of four categories: (1) likely no effect, (2) unclear, (3) possible positive effect, or (4) likely positive effect. When we categorized the data as “unclear” based solely on health outcomes, we then examined and classified surrogate outcomes for that particular clinical condition. Findings. We identified 114 unique studies that met inclusion criteria. The largest number of studies addressed patients with hypertension (51 studies) and obesity (43 studies). Eighty-four trials used a single PGHD device, 23 used 2 PGHD devices, and the other 7 used 3 or more PGHD devices. Pedometers, blood pressure (BP) monitors, and scales were commonly used in the same studies. Overall, we found a “possible positive effect” of PGHD interventions on health outcomes for coronary artery disease, heart failure, and asthma. For obesity, we rated the health outcomes as unclear, and the surrogate outcomes (body mass index/weight) as likely no effect. For hypertension, we rated the health outcomes as unclear, and the surrogate outcomes (systolic BP/diastolic BP) as possible positive effect. For cardiac arrhythmias or conduction abnormalities we rated the health outcomes as unclear and the surrogate outcome (time to arrhythmia detection) as likely positive effect. The findings were “unclear” regarding PGHD interventions for diabetes prevention, sleep apnea, stroke, Parkinson’s disease, and chronic obstructive pulmonary disease. Most studies did not report harms related to PGHD interventions; the relatively few harms reported were minor and transient, with event rates usually comparable to harms in the control groups. Few studies reported cost-effectiveness analyses, and only for PGHD interventions for hypertension, coronary artery disease, and chronic obstructive pulmonary disease; the findings were variable across different chronic conditions and devices. Patient adherence to PGHD interventions was highly variable across studies, but patient acceptance/satisfaction and usability was generally fair to good. However, device engineers independently evaluated consumer wearable and handheld BP monitors and considered the user experience to be poor, while their assessment of smartphone-based electrocardiogram monitors found the user experience to be good. Student volunteers involved in device usability testing of the Weight Watchers Online app found it well-designed and relatively easy to use. Implications. Multiple randomized controlled trials (RCTs) have evaluated some PGHD technologies (e.g., pedometers, scales, BP monitors), particularly for obesity and hypertension, but health outcomes were generally underreported. We found evidence suggesting a possible positive effect of PGHD interventions on health outcomes for four chronic conditions. Lack of reporting of health outcomes and insufficient statistical power to assess these outcomes were the main reasons for “unclear” ratings. The majority of studies on PGHD technologies still focus on non-health-related outcomes. Future RCTs should focus on measurement of health outcomes. Furthermore, future RCTs should be designed to isolate the effect of the PGHD intervention from other components in a multicomponent intervention.
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