Download or read book Determination of Surface Heat Flux Using a Single Embedded Thermocouple written by and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimation of Surface Temperature and Heat Flux Using Embedded Thermocouples written by and published by . This book was released on 2007 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates several new methods for estimating surface temperature and heat flux based on thermocouples embedded within the interior of a test article. The test apparatus was a Mach 2 axisymmetric rocket nozzle with probes embedded at depths of 1/8" and 1/4" from the inner surface of the nozzle at the throat and exit locations. Three methods for numerically estimating temperature and heat flux at the surface of the nozzle were considered: a one-thermocouple slab-coordinate method, a two-thermocouple slabcoordinate method, and a finite-element analysis (FEA) based on a one-dimensional cylindrical coordinate method. Comparisons between the methods, as well as temperature and heat flux uncertainties caused by the axial location of the thermocouple probes (and resulting radius of curvature of the nozzle materials considerations), are presented. The slab-coordinate two-thermocouple and FEA methods show good agreement in both thermocouple probe axial locations, but the one-thermocouple measurement showed significant uncertainty for the throat location, but offered good agreement at the exit location. Suggestions are made for future improvements in experimentation and analysis methods.

Download or read book Determination of Thermal Properties Using Embedded Thermocouples written by Nicholas Anthony Lister and published by . This book was released on 2010 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Purpose of this thesis is to experimentally demonstrate an inversion analysis technique, developed by Dr. Jay Frankel (UTK), that utilizes transient temperature data from probes embedded at known locations in a material. This allows one to determine thermal properties (thermal diffusivity and thermal conductivity) of the material, surface temperature, and the surface heat flux as they change with time. Dr. Frankel's inversion method can be used to determine surface temperature and heat flux of a one-dimensional semi-infinite slab based on the transient data from one or two embedded probes, if the thermal conductivity and thermal diffusivity of the material are known. Frankel's theory suggests that the thermal properties of the material can be determined if transient data from two thermocouple (TC) probes at known locations and the heat flux at the surface are known. This thesis investigates finding the thermal properties and surface temperature of materials using a two embedded thermocouple approach. As an initial check to the inversion analysis, the theoretical temperature solution for a one-dimensional semi-infinite slab was used. This validated that the analysis could converge to the constant thermal properties for the theoretical material. An experiment was run again to provide data for the materials copper and aluminum. Using a real material is fundamentally different from using theoretical determined (analytical) data, because the thermal properties for a real material vary with temperature. Since the inversion analysis converged to a constant solution for the theoretical temperatures, it was believed that the real material will converge to a solution. However, it was seen that the thermal diffusivity for the real materials never converged to the expected value. Although, when a constant handbook value for the thermal diffusivity is used to calculate the thermal conductivities from the experimental temperature data collected from the internal probes, the inversion analysis resulted in good agreement with experiment.

Download or read book On Determination of Transient Surface Temperature and Heat Flux by Imbedded Thermocouple in a Hollow Cylinder written by Ching-Jen Chem and published by . This book was released on 1974 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical analysis for determination of transient surface temperature and heat flux as measured by an embedded thermocouple in a hollow cylinder is given for the Fourier modulus less than 0.01. This solution is presented as a single series in which only the coefficients of the series depend on the experiment; specifically, the temperature response measured by a thermocouple. The solution may be used to predict surface heat flux and temperature distribution of gun barrels or any other highly transient cyclical thermal device by means of a temperature probe which can be positioned remote from the surface. (Modified author abstract).

Download or read book Single thermocouple Method for Determining Heat Flux to a Thermally Thick Wall written by Floyd G. Howard and published by . This book was released on 1968 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Tech Briefs written by and published by . This book was released on 1978 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Fabrication Calibration and Testing of High temperature Sensors for Measurement of Surface Heat Flux Temperature and Total Heat Transfer written by Justin Alfred Myrick (Jr.) and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation outlines the design, fabrication, calibration and testing of sensors that can be used to measure surface heat flux, surface temperature and total surface heat transfer. These sensors, once calibrated, use in-depth thermocouple (TC) data to estimate the surface boundary conditions which allows operation at high temperatures and harsh thermal environments. Calibration of these sensors is accomplished through the one-probe, two-probe and total surface heat transfer calibration integral equation formulations. The one-probe calibration integral equation method (CIEM) can be used to predict the surface thermal boundary conditions of a field test using the in-depth TC temperature from that test and data from a calibration test which consists of measured surface boundary conditions and data from the same in-depth TC. The calibration integral equation has the form of a Volterra integral equation which is ill-posed and requires regularization to achieve a stable prediction. The one-probe calibration integral technique may only be used when the thermal boundary condition at the back surface of the sensor during the calibration and reconstruction tests is the same. The two-probe CIEM removes this restriction by requiring data from two calibration tests consisting of the measured surface thermal boundary conditions and corresponding temperature data from two in-depth TC probes. The two sets of calibration data are used to predict the surface thermal boundary conditions of a reconstruction test when the temperature data from the two in-depth TCs from the reconstruction test are provided. The calibration integral equation for determination of the total surface heat transfer uses a simplified two-dimensional geometry where three of the domain boundaries are adiabatic and the fourth is an unknown spatially variable surface heat flux. The total heat transfer into the domain is predicted using the average in-depth temperature data from a series of thermocouples located on a fixed plane parallel to the heated surface. These formulations had previously been tested using high temperature numerical data. However, it is essential to verify these methods using high temperature experimental data to demonstrate their use in physical applications. This dissertation also provided novel methods to estimate the necessary regularization parameters using the calibration data.

Download or read book Single thermocouple Method for Determining Heat Flux to a Thermally Thick Wall written by Floyd G. Howard and published by . This book was released on 1968 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inverse Heat Conduction and Heat Exchangers written by Suvanjan Bhattacharyya and published by BoD – Books on Demand. This book was released on 2020-12-02 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct solution of the heat conduction equation with prescribed initial and boundary conditions yields temperature distribution inside a specimen. The direct solution is mathematically considered as a well-posed one because the solution exists, is unique, and continuously depends on input data. The estimation of unknown parameters from the measured temperature data is known as the inverse problem of heat conduction. An error in temperature measurement, thermal time lagging, thermocouple-cavity, or signal noise data makes stability a problem in the estimation of unknown parameters. The solution of the inverse problem can be obtained by employing the gradient or non-gradient based inverse algorithm. The aim of this book is to analyze the inverse problem and heat exchanger applications in the fields of aerospace, mechanical, applied mechanics, environment sciences, and engineering.

Download or read book Fundamentals of Heat and Mass Transfer written by T. L. Bergman and published by John Wiley & Sons. This book was released on 2011-04-12 with total page 2249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Heat and Mass Transfer, 7th Edition is the gold standard of heat transfer pedagogy for more than 30 years, with a commitment to continuous improvement by four authors having more than 150 years of combined experience in heat transfer education, research and practice. Using a rigorous and systematic problem-solving methodology pioneered by this text, it is abundantly filled with examples and problems that reveal the richness and beauty of the discipline. This edition maintains its foundation in the four central learning objectives for students and also makes heat and mass transfer more approachable with an additional emphasis on the fundamental concepts, as well as highlighting the relevance of those ideas with exciting applications to the most critical issues of today and the coming decades: energy and the environment. An updated version of Interactive Heat Transfer (IHT) software makes it even easier to efficiently and accurately solve problems.

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1989 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Highlights of the Global Modeling and Simulation Branch for 1986 1987 written by Wayman E. Baker and published by . This book was released on 1988 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1972 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanisms of Pyrolysis Oxidation and Burning of Organic Materials written by Leo Aloysius Wall and published by . This book was released on 1972 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Treating written by Kiyoshi Funatani and published by ASM International. This book was released on 2000-01-01 with total page 1214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Metallurgical Process Design written by George E. Totten and published by CRC Press. This book was released on 2004-05-25 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviewing an extensive array of procedures in hot and cold forming, casting, heat treatment, machining, and surface engineering of steel and aluminum, this comprehensive reference explores a vast range of processes relating to metallurgical component design-enhancing the production and the properties of engineered components while reducing manufacturing costs. It surveys the role of computer simulation in alloy design and its impact on material structure and mechanical properties such as fatigue and wear. It also discusses alloy design for various materials, including steel, iron, aluminum, magnesium, titanium, super alloy compositions and copper.