Thermal Conductivity of Nitrogen‐Carbon Dioxide Mixtures

1959 ◽  
Vol 31 (2) ◽  
pp. 571-572 ◽  
Author(s):  
Richard S. Brokaw
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity

An electrical analyzer for carbon dioxide in respiratory gases

1962 ◽  
Vol 17 (1) ◽  
pp. 126-130
Author(s):  
Leon Bernstein ◽  
Chiyoshi Yoshimoto
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Medical Students ◽  
Venous Blood ◽  
Mixed Venous Blood ◽  
The Subject ◽  
Respiratory Gases ◽  
Rebreathing Method ◽  
Mixed Venous

The analyzer described was de signed for measuring the concentration of carbon dioxide in the bag of gas from which the subject rebreathes in the “rebreathing method” for estimating the tension of carbon dioxide in mixed venous blood. Its merits are that it is cheap, robust, simple to construct and to service, easy to operate, and accurate when used by untrained operators. (Medical students, unacquainted with the instrument, and working with written instructions only, obtained at their first attempt results accurate to within ±0.36% [sd] of carbon dioxide.) The instrument is suitable for use by nurse or physician at the bedside, and also for classes in experimental physiology. Some discussion is presented of the theoretical principles underlying the design of analyzers employing thermal conductivity cells. Submitted on July 13, 1961

Thermal Conductivity and Prandtl Number of Carbon Dioxide and Carbon-Dioxide Air Mixtures at One Atmosphere

1961 ◽  
Vol 83 (2) ◽  
pp. 125-131 ◽  
Author(s):  
Jerome L. Novotny ◽  
Thomas F. Irvine
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Prandtl Number ◽  
Maximum Error ◽  
Intermolecular Force ◽  
Temperature Range ◽  
Average Temperature ◽  
Pure Carbon ◽  
Prandtl Numbers ◽  
Pure Carbon Dioxide

By measuring laminar recovery factors in a high velocity gas stream, experimental determinations were made of the Prandtl number of carbon dioxide over a temperature range from 285 to 450 K and of carbon-dioxide air mixtures at an average temperature of 285 K with a predicted maximum error of 1.5 per cent. Thermal conductivity values were deduced from these Prandtl numbers and compared with literature values measured by other methods. Using intermolecular force constants determined from literature experimental data, viscosities, thermal conductivities, and Prandtl numbers were calculated for carbon-dioxide air mixtures over the temperature range 200 to 1500 deg for mixture ratios from pure air to pure carbon dioxide.

scholarly journals The thermal conductivity of some gases at 0° C

1934 ◽  
Vol 144 (853) ◽  
pp. 496-513 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Kinetic Theory ◽  
Molecular Changes ◽  
The Past ◽  
Comprehensive Account ◽  
The Absolute ◽  
Relative Measurements ◽  
Gas Conduction ◽  
Heat Transfers

During recent years an increased interest has been displayed in the phenomena of gas conduction, particularly in their application to the observation of molecular changes and chemical dissociations. While relative measurements usually suffice for these purpose, there have also been carefully planned researches on the absolute thermal conductivities of gases, the results of which are of value in the development of the kinetic theory. A comprehensive account of the methods which have been employed in the past for the measurement of the thermal conductivity of gases is given in a recent paper by Trautz and Zündel, who include also a table of the available data to 1931 for air, hydrogen, and carbon dioxide. The lack of agreement between the values obtained by different workers shown in this table can be explained by the smallness of the quantity measured, and by the difficulty of eliminating the heat transfers by convection and by radiation, one or both of which are always present.

From micro/nano structured isotactic polypropylene to a multifunctional low-density nanoporous medium

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 108056-108066 ◽  
Author(s):  
Mehdi Saniei ◽  
Minh-Phuong Tran ◽  
Seong-Soo Bae ◽  
Piyapong Boahom ◽  
Pengjian Gong ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Porous Medium ◽  
Supercritical Carbon Dioxide ◽  
Isotactic Polypropylene ◽  
Low Density ◽  
Low Thermal Conductivity ◽  
Supercritical Carbon

A homogeneous low-density nano-porous medium of isotactic polypropylene (iPP) with a low thermal conductivity was fabricated using supercritical carbon dioxide (scCO2).

scholarly journals Conduction of heat through powders and its dependence on the pressure and conductivity of the gaseous phase

1926 ◽  
Vol 113 (764) ◽  
pp. 459-477 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Gaseous Phase ◽  
Linear Relation ◽  
Gas Pressure ◽  
Pumice Stone ◽  
Solid Part ◽  
Thermal Conductivities

The object of our investigation has been to study the conduction of heat through a light powder and to find how it depends upon the pressure and thermal conductivity of the gas in which the powder is immersed. A solution of this question is part of the solution of the problem of the conduction of heat through a certain class of “solid” heat insulators—a class which includes those of lowest thermal conductivity. The class of insulator referred to are solids dispersed in gases, or gases dispersed in solids, and consists of three kinds of substances, (1) fibrous substances ( e.g., wool, eiderdown, asbestos), (2) cellular substances (e. g., cork, pumice stone) and (3) powders (e. g., lamp-black, powdered cork, silox or monox). It might be expected that substances so different as those mentioned would have very different thermal conductivities. Actually their conductivities range from about 8 to 11 times 10 -5 cal. cm. -1 deg. -1 sec. -1 . As there is nothing common to the solid part of these substances, their conductivities, it would seem probable, are determined mainly by the factor which is common to them all, that is, the gaseous part, which is air. Our experiments have been made with a very light powder known as monox or silox, and the conductivity of this powder when immersed in air, in carbon dioxide, and in hydrogen at various pressures has been determined. We find that there is a linear relation between the conductivity of the powder and the logarithm of the pressure of the gas in which it is immersed, so that if k is the measure of the conductivity of the powder, k 0 that of the gas in which it is immersed, and p the measure of the gas pressure, then k = ½ k 0 log 10 p/n approximately, where n is a constant for a given gas.

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