Evaluation of Thermal Conductivity of Gases at Atmospheric Pressure through a Corresponding States Method

2012 ◽  
Vol 51 (9) ◽  
pp. 3844-3849 ◽  
Author(s):  
Farhad Gharagheizi ◽  
Ali Eslamimanesh ◽  
Mehdi Sattari ◽  
Behnam Tirandazi ◽  
Amir H. Mohammadi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Atmospheric Pressure ◽  
Corresponding States

A New Method to Measure Prandtl Number and Thermal Conductivity of Fluids

1957 ◽  
Vol 24 (1) ◽  
pp. 25-28
Author(s):  
E. R. G. Eckert ◽  
T. F. Irvine
Keyword(s):  
Thermal Conductivity ◽  
Boundary Layer ◽  
Prandtl Number ◽  
High Velocity ◽  
Atmospheric Pressure ◽  
New Method ◽  
Test Results ◽  
Test Setup ◽  
Velocity Boundary Layer ◽  
Layer Flow

Abstract A new method is described by which the Prandtl number and indirectly the thermal conductivity of fluids can be measured. The method is based on the fact that a well-established, unique relation exists between the Prandtl number and the recovery factor for laminar high-velocity boundary-layer flow. The test setup is described which has been devised for such measurements, and test results are presented for air at atmospheric pressure and temperatures between 60 and 350 F.

Thermal Conductivity of Complex Hydrocarbon Systems at Pressures Up To 1000 MPa

2016 ◽  
Vol 138 (11) ◽  
Author(s):  
Vladimir Kutcherov ◽  
Alexey Chernoutsan ◽  
Anton Kolesnikov ◽  
Boris Grigoriev
Keyword(s):  
Thermal Conductivity ◽  
Crude Oil ◽  
Temperature Coefficient ◽  
Atmospheric Pressure ◽  
Pressure Range ◽  
Gas Condensate ◽  
Transient Hot Wire ◽  
Hot Wire ◽  
Coefficient Of Thermal Conductivity ◽  
Transient Hot Wire Technique

The thermal conductivity of five samples of crude oil and one sample of gas condensate was measured by the transient hot-wire technique. The measurements were made along isotherms (245, 250, 273, 295, 320, 336, and 373 K) in the pressure range from atmospheric pressure up to 1000 MPa and along isobars (at 0.1, 100, 200, 300, 400, 500, and 1000 MPa) in the temperature range 245–450 K. It was observed that the thermal conductivity of the samples investigated strongly depends on the pressure and rises with increasing pressure for all the temperatures. At a certain pressure, the temperature coefficient of thermal conductivity reverses from negative to positive. The pressure at which this reversal was observed varied in the range of 300–380 MPa.

scholarly journals Thermal Conductivity of Steam at Atmospheric Pressure

1969 ◽  
Vol 11 (4) ◽  
pp. 392-401 ◽  
Author(s):  
T. J. S. Brain
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Steady State ◽  
Atmospheric Pressure ◽  
Concentric Cylinder ◽  
Temperature Range ◽  
Steady State Method ◽  
New Correlation ◽  
Paper Work ◽  
State Method

In this paper work carried out by the author to measure the thermal conductivity of steam at atmospheric pressure in the temperature range 100-700°C is reported. This work was undertaken in view of the discrepancies which exist in the experimental data at atmospheric pressure. In particular, the serious differences which exist at the high temperatures between the results of Russian experimenters, who give higher values than those given by American and German workers, needed investigation. Utilizing two concentric cylinder cells an absolute steady state method has been used to measure the thermal conductivity of steam in the temperature range 100-700°C, at atmospheric pressure, with a probable accuracy estimated to be within ± l·5-±2 per cent. The results obtained confirm Russian observations at the higher temperatures and it is hoped that these results will help finally to resolve the inconsistencies in the experimental data. A fresh assessment of all the experimental data is given by the author where arguments in favour of both the lower and higher atmospheric lines are discussed. A new correlation of experimental data has been undertaken and a reduction in the tolerances put on the equation defining the atmospheric line from ±3 per cent in the range 100-400°C and ±4 per cent in the range 400-700°C to ±2 per cent over the complete range 100-700°C is now recommended.

Thermal Conductivity of Gaseous and Liquid Ammonia

1988 ◽  
Vol 110 (4a) ◽  
pp. 992-995 ◽  
Author(s):  
A. A. Clifford ◽  
R. Tufeu
Keyword(s):  
Thermal Conductivity ◽  
Liquid Phase ◽  
Transport Properties ◽  
Gas Phase ◽  
Atmospheric Pressure ◽  
Liquid Ammonia ◽  
Preliminary Assessment ◽  
Good Comparison ◽  
Current Program

The thermal conductivity of gaseous and liquid ammonia has been measured in the range 300–300 K and at pressures up to 50 MPa. The measurements were a necessary preliminary to a fitting of the thermal conductivity surface in the density–temperature plane, which is part of the current program of the Transport Properties Subcommittee of the I.U.P.A.C. Results were obtained that are believed to be accurate to 2 percent. It is difficult to make a good comparison of these results with previous data until a full correlation of the thermal conductivity of ammonia is carried out. A preliminary assessment for the liquid phase indicates that agreement is reasonable over much of the range with differences up to around 5 percent under certain conditions. For the gas phase an approximate extrapolation to atmospheric pressure can be made and the results compared with some recent recommended values. Differences of ±3 percent are observed.

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