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A Method For Improving Two Dimensional High Heat Flux Estimates From Surface Temperature Measurements
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Book Synopsis A Method for Improving Two-dimensional High Heat Flux Estimates from Surface Temperature Measurements by : D. Greg Walker
Download or read book A Method for Improving Two-dimensional High Heat Flux Estimates from Surface Temperature Measurements written by D. Greg Walker and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Numerical Heat Transfer, Volume 2 by : W. Minkowycz
Download or read book Advances in Numerical Heat Transfer, Volume 2 written by W. Minkowycz and published by CRC Press. This book was released on 2018-12-13 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the advances in numerical heat transfer modeling by applying high-performance computing resources, striking a balance between generic fundamentals, specific fundamentals, generic applications, and specific applications.
Book Synopsis Estimation of Highly Dynamic Heat Flux from Surface Temperature Measurements Using the Adjoint Method by : Tahar Loulou
Download or read book Estimation of Highly Dynamic Heat Flux from Surface Temperature Measurements Using the Adjoint Method written by Tahar Loulou and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 2D Non-uniform, Time-dependent, High Heat Flux Estimates Using Data from Thin Film Sensors And/or PT Measurements by : Robert H. Smith
Download or read book 2D Non-uniform, Time-dependent, High Heat Flux Estimates Using Data from Thin Film Sensors And/or PT Measurements written by Robert H. Smith and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solution of General Two-dimensional Inverse Heat Conduction Problems and One-dimensional Inverse Melting Problems by : John Siuming Tu
Download or read book Solution of General Two-dimensional Inverse Heat Conduction Problems and One-dimensional Inverse Melting Problems written by John Siuming Tu and published by . This book was released on 1988 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Measurement of Heat Flow in the Ground and the Theory of Heat Flux Meters by : Peter Schwerdtfeger
Download or read book The Measurement of Heat Flow in the Ground and the Theory of Heat Flux Meters written by Peter Schwerdtfeger and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of heat flux meters has been examined by experimental, electrical analogue and numerical means. The results indicate the more general applicability of the flux meter equation first proposed by Philip (1961) for the special case of spheroidal meters, provided certain precautions are taken. The purely geometric parameter appearing in this equation has been related to meter shape and a functional connection has been suggested. It is proposed that pairs of thermal sensors be used to monitor thermal conductivity continuously and the use of nonuniform 'focusing' heat flux meters is recommended in cases where the physical cross section of a thermopile should remain small compared to the resultant thermal cross section. Finally a number of calibration techniques are reported, including the use of a novel radiation enclosure in which meters are temporarily tested as net radiometers, (Author).
Book Synopsis Real-time Heat Flux Estimation Using Filter Based Solutions for Inverse Heat Conduction Problems by : Hamidreza Najafi
Download or read book Real-time Heat Flux Estimation Using Filter Based Solutions for Inverse Heat Conduction Problems written by Hamidreza Najafi and published by . This book was released on 2015 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Real-time heat flux measurement has great significance in numerous applications such as metal heat treating, quenching, fire safety tests, furnace operation, thermal therapy and more. Direct measurement of heat flux is not always possible and therefore, developing methods for accurate heat flux estimation using temperature data is desirable for several applications. An Inverse Heat Conduction Problem (IHCP) has to be solved to estimate the unknown heat flux at the surface, knowing the temperature measurements in the interior points of the medium. This problem is mathematically ill-posed and a small error in temperature data result in large errors in estimated heat fluxes. The focus of this dissertation is developing solutions for IHCP's using digital filter approach. A series of IHCP's are closely investigated and filter based solutions are developed for each problem which allows real-time heat flux estimation. The characteristics of the filter form solutions are discussed in detail for each case. A series of articles are written to discuss these problems. The articles in this dissertation provide real-time solutions for a series of IHCP's with wide applications in industries. In particular, a filter based solution technique is developed for heat flux estimation in multi-layer mediums with temperature dependent material properties. While one application of this solution technique in using Directional Flame Thermometers is discussed in detail, there are many other applications for this solution method, e.g. in thermal therapy and tissue engineering (Articles 1-5). Furthermore, the concept of using artificial neural networks as digital filters for real-time heat flux estimation is investigated in Article 6. Several test cases are demonstrated to study the applicability of ANN's for solving linear and non-linear IHCP's. Finally, developing filter form solutions for two-dimensional IHCP's with multiple unknown heat fluxes is presented in Article 7. This study not only provides a basis for heat flux estimation in heat treating processes in industries, but also proves the applicability of the filter solution for multi-dimensional mediums with more complexities and demonstrates the characteristics of this technique.
Book Synopsis Uncertainty Analysis of Heat Flux Measurements Estimated Using a One-dimensional, Inverse Heat-conduction Program by : James Thomas Nakos
Download or read book Uncertainty Analysis of Heat Flux Measurements Estimated Using a One-dimensional, Inverse Heat-conduction Program written by James Thomas Nakos and published by . This book was released on 2005 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of heat flux in hydrocarbon fuel fires (e.g., diesel or JP-8) is difficult due to high temperatures and the sooty environment. Un-cooled commercially available heat flux gages do not survive in long duration fires, and cooled gages often become covered with soot, thus changing the gage calibration. An alternate method that is rugged and relatively inexpensive is based on inverse heat conduction methods. Inverse heat-conduction methods estimate absorbed heat flux at specific material interfaces using temperature/time histories, boundary conditions, material properties, and usually an assumption of one-dimensional (1-D) heat flow. This method is commonly used at Sandia.s fire test facilities. In this report, an uncertainty analysis was performed for a specific example to quantify the effect of input parameter variations on the estimated heat flux when using the inverse heat conduction method. The approach used was to compare results from a number of cases using modified inputs to a base-case. The response of a 304 stainless-steel cylinder [about 30.5 cm (12-in.) in diameter and 0.32-cm-thick (1/8-in.)] filled with 2.5-cm-thick (1-in.) ceramic fiber insulation was examined. Input parameters of an inverse heat conduction program varied were steel-wall thickness, thermal conductivity, and volumetric heat capacity; insulation thickness, thermal conductivity, and volumetric heat capacity, temperature uncertainty, boundary conditions, temperature sampling period; and numerical inputs. One-dimensional heat transfer was assumed in all cases. Results of the analysis show that, at the maximum heat flux, the most important parameters were temperature uncertainty, steel thickness and steel volumetric heat capacity. The use of a constant thermal properties rather than temperature dependent values also made a significant difference in the resultant heat flux; therefore, temperature-dependent values should be used. As an example, several parameters were varied to estimate the uncertainty in heat flux. The result was 15-19% uncertainty to 95% confidence at the highest flux, neglecting multidimensional effects.
Book Synopsis Journal of Thermophysics and Heat Transfer by :
Download or read book Journal of Thermophysics and Heat Transfer written by and published by . This book was released on 2000 with total page 1190 pages. Available in PDF, EPUB and Kindle. Book excerpt: This journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. It publishes papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include conductive, convective, and radiative modes alone or in combination and the effects of the environment.
Book Synopsis Two-dimensional Nonuniform, Time Dependent, Heat Flux Estimates Using Data from Thin Film Sensors And/or Phosphor Thermography Measurements by : Robert Hyrum Smith
Download or read book Two-dimensional Nonuniform, Time Dependent, Heat Flux Estimates Using Data from Thin Film Sensors And/or Phosphor Thermography Measurements written by Robert Hyrum Smith and published by . This book was released on 2000 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Infrared Thermography for Thermo-Fluid-Dynamics by : Tommaso Astarita
Download or read book Infrared Thermography for Thermo-Fluid-Dynamics written by Tommaso Astarita and published by Springer Science & Business Media. This book was released on 2012-08-04 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared thermography is a measurement technique that enables to obtain non intrusive measurements of surface temperatures. One of the interesting features of this technique is its ability to measure a full two dimensional map of the surface temperature and for this reason it has been widely used as a flow visualization technique. Since the temperature measurements can be extremely accurate it is possible, by using a heat flux sensor, also to measure convective heat transfer coefficient distributions on a surface making the technique de facto quantitative. This book, starting from the basic theory of infrared thermography and heat flux sensor guides, both the experienced researcher and the young student, in the correct application of this powerful technique to various practical problems. A significant number of examples and applications are also examined in detail.
Book Synopsis ASME Proceedings of the 7th AIAA/ASME Joint Thermophysics and Heat Transfer Conference: Phase change heat transfer. Boiling heat transfer and heat pipes. Nonlinear two-phase flow by :
Download or read book ASME Proceedings of the 7th AIAA/ASME Joint Thermophysics and Heat Transfer Conference: Phase change heat transfer. Boiling heat transfer and heat pipes. Nonlinear two-phase flow written by and published by . This book was released on 1998 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Japanese Science and Technology by :
Download or read book Japanese Science and Technology written by and published by . This book was released on 1986 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Revisiting the Temperature Gradient Method by : B. Hernández-Morales
Download or read book Revisiting the Temperature Gradient Method written by B. Hernández-Morales and published by . This book was released on 2018 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cooling curve analysis has emerged as a preferred method to characterize the cooling power of quenching media. This methodology is based on measuring the local cooling curve in a laboratory-scale probe using thermocouples. Several methods have been proposed to analyze cooling curves. Among them, the temperature gradient method (TGM) developed by Professor Lišcic uses cooling curves measured at the surface and 1.5 mm below the surface of a cylindrical probe (the Lišcic-Nanmac probe) to calculate the surface heat flux during quenching. In this work, we measured the thermal response at a location near the surface of cylindrical probes, fabricated with AISI 304 stainless steel, with two different geometries (conical- and hemispherical-end) during quenching from 850°C with water at 60°C, flowing parallel to the probe's longitudinal axis. Together with the probe geometry, the experimental matrix included two values of water velocity (0.2 and 0.6 m/s). The data was used to estimate the surface heat flux and thermal response at the probe surface by solving a one-dimensional inverse heat conduction problem (IHCP) without phase change. The TGM was then applied to re-estimate the surface heat flux using the cooling curves at the subsurface (measured) and at the surface (estimated by solving the IHCP). The surface thermal gradient computed solving the IHCP is higher and, therefore, the surface heat flux estimated solving the IHCP is also higher than the value calculated with the TGM. The hemispherical-end probe delays the rupture of the vapor film, producing low values of the surface temperature at the time of maximum heat extraction; this results in extremely high values of the heat-transfer coefficient, which precludes the use of this geometry in conjunction with the TGM. The thermal profiles are parabolic, which restricts the maximum depth at which a subsurface thermocouple may be placed to use the TGM confidently.
