Platinum Resistance Thermometer Calibrations PDF Download
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Author: B. W. Mangum
Publisher:
ISBN:
Category : Resistance thermometers
Languages : en
Pages : 372
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Author: B. W. Mangum
Publisher:
ISBN:
Category : Resistance thermometers
Languages : en
Pages : 372
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Author: Jason D. Wolf
Publisher:
ISBN:
Category :
Languages : en
Pages : 266
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Measurements of the heat transfer coefficient distribution on flat and ribbed surfaces with interrupted heating are presented. One application of this type of thermal boundary condition is the cooling of surface mounted modules in electronic packaging. Heating occurs at the modules, with no heating between the modules. The heat transfer measurements in the present study are made using the heated-coating method with a thermochromic liquid crystal (TLC). The "coating" is vacuum-deposited gold on a plastic sheet, which is mounted on a Styrofoam surface. The gold film is electrically heated to produce the surface heat flux. The surface temperature is measured by capturing color images of the TLC, using the hue technique. These surface temperature plots are transformed into heat transfer coefficient distributions on the surface of the models. Interrupted heating on the flat surface is obtained by heating strips perpendicular to the freestream flow, with insulated spaces between the strips. The ribbed surface is heated on the top of the ribs only, with insulated unheated cavities in-between. The results show that, as expected, the local heat transfer coefficient is higher on the heated strips of the flat surface interrupted heating case, than would be present at the same locations with a uniform heat flux. The interruption of the thermal boundary layer at each unheated section allows it to "reset", thereby causing the higher heat transfer on the following heated section. The ribbed model shows a slight increase in heat transfer on the ribs above that of the flat plate interrupted heating model. The cavities appear to introduce mixing that causes this change. The increase in h due to the ribs is small, however, when compared to the effect of the interrupted heating.
Author: Robin E. Bentley
Publisher: Springer Science & Business Media
ISBN: 9789814021098
Category : Science
Languages : en
Pages : 248
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Volume 1 of the Handbook of Temperature Measurement, prepared by the CSIRO National Measurement Laboratory, Australia, details the principles and techniques involved in the measurement of humidity, in cryogenic and radiation thermometry and a variety of unconventional methods of temperature measurement. Other topics considered are thermal conductivity and the traceability of measurement. Authors in this volume include Mark J. Ballico, Edwin C. Morris, Gary Rosengarten, Anna Schneider, Glenda Sandars, Laurie M. Besley, Jeffrey Tapping, and Anthony J. Farmer.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1532
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Author:
Publisher: Stanford University Press
ISBN:
Category :
Languages : en
Pages : 736
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Author: Nader Bagheri
Publisher:
ISBN:
Category :
Languages : en
Pages : 486
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Author: Arash Berukhim
Publisher:
ISBN:
Category :
Languages : en
Pages : 326
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Author: Gary A. Herbert
Publisher:
ISBN:
Category : Atmospheric pressure
Languages : en
Pages : 112
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Author: C. M. Jimenez
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 30
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Polycrystalline platinum and palladium were bombarded with monoenergetic electrons at temperatures below 9K. Changes in electrical resistivity R(E) = delta rho/electron-sq cm were measured in the energy range 1.1 to 3.0 MeV. The experimental values found in this interval are consistent with displacement threshold energies of 37 eV for Pt and 34 eV for Pd. The resistivities per unit defect concentration were found to be 0.00075 and 0.0009 ohm-cm for Pt and Pd respectively. The threshold energies found here, together with values reported for other face centered cubic elements, are shown to be directly proportional to atomic number and inversely proportional to the lattice parameter. It is also shown that the resistivities per unit defect concentration can be correlated with the resistivity at 0C. Analysis of the energy dependence of the damage production indicates atomic displacement cascades are markedly inhibited, which is consistent with deuteron damage studies. Alternative multiple displacement models and possible mechanisms are discussed. (Author).
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 608
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