The Precise Determination of Thermal Conductivity and Electrical Resistivity of Solids at High Temperatures by Direct Electrical Heating Methods PDF Download
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Author: Reginald W. Powell Publisher: ISBN: Category : Heat Languages : en Pages : 112
Book Description
Direct electrical heating methods possess desirable features for determinations of thermal conductivity values to high temperatures. Since unreliable data have been obtained by previous workers using these methods, a systematic evaluation of the various techniques was initiated. An apparatus capable of providing a variety of thermal/electrical boundary conditions to a single specimen as prescribed by particular techniques was designed and fabricated. With this apparatus thermal conductivity, and other thermophysical properties, can be determined on a single specimen by various methods, permitting direct evaluation and comparison of the results. In connection with this experimental effort, the theoretical models of the methods and analyses of the conditions which must be met in the experimental apparatus are being studied. The ultimate objective of the program is to devise a technique(s) suitable for determinations to temperatures of the order of 2500 C, utilizing test specimens of simple geometry and minimum volume. (Author).
Author: Reginald W. Powell Publisher: ISBN: Category : Heat Languages : en Pages : 112
Book Description
Direct electrical heating methods possess desirable features for determinations of thermal conductivity values to high temperatures. Since unreliable data have been obtained by previous workers using these methods, a systematic evaluation of the various techniques was initiated. An apparatus capable of providing a variety of thermal/electrical boundary conditions to a single specimen as prescribed by particular techniques was designed and fabricated. With this apparatus thermal conductivity, and other thermophysical properties, can be determined on a single specimen by various methods, permitting direct evaluation and comparison of the results. In connection with this experimental effort, the theoretical models of the methods and analyses of the conditions which must be met in the experimental apparatus are being studied. The ultimate objective of the program is to devise a technique(s) suitable for determinations to temperatures of the order of 2500 C, utilizing test specimens of simple geometry and minimum volume. (Author).
Author: Raymond Ellory Taylor Publisher: ISBN: Category : Heat Languages : en Pages : 65
Book Description
The report discusses the progress on a program for evaluating direct electrical heating methods for high temperature thermal conductivity determinations. A multi-purpose apparatus used in the evaluation of these methods, has generated data simultaneously on thermal conductivity, electrical resistivity, total hemispherical emittance and spectral emittance (0.65 microns) to 1800 K under high vacuum. Problems associated with emittance are extremely important in thermal conductivity determinations at high temperatures using direct heating methods. Great care must be taken to insure that the emittance remains constant over the central portion of the test specimen. The mathematical techniques used to compute thermal conductivity from the experimental data were explored and considerably advanced. These techniques eliminated the need for mathematical approximations which severely limit the region of applicability. One of these techniques was easily extended to the general case which includes three conductivity methods as special cases. Therefore, the need to match certain experimental conditions was eliminated. The inclusion of temperature-dependent physical properties was also readily included in this technique. The mathematical techniques also yielded temperature profiles which could be compared to the experimental profiles. (Author).
Author: Air Force Materials Laboratory (U.S.) Publisher: ISBN: Category : Materials Languages : en Pages : 270
Book Description
Technical reports published by the Air Force Materials Laboratory during the period 1 January 1967-31 December 1967 are abstracted herein and indexed by branches of the laboratory, technical subject matter, investigator, project monitor and contractor. Reports on research conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included.
Author: Kenneth E. Wilkes Publisher: CRC Press ISBN: 1000445747 Category : Technology & Engineering Languages : en Pages : 652
Book Description
This book contains keynote lectures and 54 technical papers, presented at the 23rd International Thermal Conductivity Conference, on various topics, including techniques, coatings and films, theory, composites, fluids, metals, ceramics, and organics, related to thermal conductivity.
Author: Reginald W. Powell
Author: Reginald W. Powell
Author: W. T. K. Johnson
Author: 
Author: 
Author: Raymond Ellory Taylor
Author: Air Force Materials Laboratory (U.S.)
Author: Kenneth E. Wilkes
Author: Migirdic Nalbantyan
Author: Purdue University. Thermophysical Properties Research Center
Author: United States. National Bureau of Standards