scholarly journals The Simulation of the Steady-state Concentric Cylinder Method for Determining Thermal Conductivity of Sodium Nitrate

2014 ◽  
Vol 61 ◽  
pp. 459-462 ◽  
Author(s):  
Pan Gechuanqi ◽  
Lu Jianfeng ◽  
Wei Xiaolan ◽  
Ding Jing
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Sodium Nitrate ◽  
Concentric Cylinder ◽  
Cylinder Method

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.

Optical Determination of Thermal Conductivity with a Plane Source Technique

1968 ◽  
Vol 23 (1) ◽  
pp. 44-47 ◽  
Author(s):  
Silas E. Gustafsson ◽  
Nils-Olov Halling ◽  
Rolf A. E. Kjellander
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Thermal Diffusivity ◽  
Sodium Nitrate ◽  
Molten Salts ◽  
Potassium Nitrate ◽  
Plane Source ◽  
Melting Points ◽  
Optical Determination

A recently developed plane source method for non-steady-state measurements of the thermal conductivity and thermal diffusivity of transparent liquids is now being applied to the study of molten salts. In these first measurements sodium nitrate and potassium nitrate have been investigated from their melting points to about 450°C. No temperature dependence of the thermal diffusivity can be established for either of the liquids, whereas the thermal conductivity in both cases increases very slowly with the temperature.A description of the experimental arrangement is included.

scholarly journals Thermophysical properties of some liquid binary Mg-based alloys

2017 ◽  
Vol 53 (3) ◽  
pp. 279-284
Author(s):  
Y. Plevachuk ◽  
V. Sklyarchuk ◽  
G. Pottlacher ◽  
A. Yakymovych ◽  
O. Tkach
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Thermoelectric Power ◽  
Thermophysical Properties ◽  
Point Contact ◽  
Calculated Data ◽  
Contact Method ◽  
Concentric Cylinder ◽  
Cast Alloys ◽  
Cylinder Method

In this study, some structure-sensitive thermophysical properties, namely, electrical conductivity, thermal conductivity and thermoelectric power of liquid binary alloys Al33.3Mg66.7, Mg47.6Zn52.4 and Mg33.3Zn66.7 (all in wt.%), as the most promising cast alloys to fabricate components for cars, aircraft and other complex engineering products, were investigated. The electrical conductivity and thermoelectric power were measured in a wide temperature range by the four-point contact method. The thermal conductivity was measured by the steady-state concentric cylinder method. The obtained results are compared with literature experimental and calculated data.

scholarly journals The liquid AlCu4TiMg alloy: thermophysical and thermodynamic properties

2020 ◽  
Vol 49 (1-2) ◽  
pp. 61-73
Author(s):  
YURIY PLEVACHUK ◽  
VASYL SKLYARCHUK ◽  
GERNOT POTTLACHER ◽  
THOMAS LEITNER ◽  
PETER ŠVEC SR. ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Tension ◽  
Thermoelectric Power ◽  
Pure Aluminum ◽  
Point Contact ◽  
Calculated Data ◽  
Electromagnetic Levitation ◽  
Contact Method ◽  
Concentric Cylinder ◽  
Cylinder Method

In this study, some structure-sensitive thermophysical properties, namely, thermal conductivity, thermoelectric power, density and surface tension of liquid AlCu4TiMg alloy, as one of the most promising cast alloys to fabricate components for cars, aircraft and other complex engineering products, were investigated. Thermoelectric power was measured in a wide temperature range by the four-point contact method. Thermal conductivity was investigated by the steady-state concentric cylinder method. The oscillating drop technique combined with electromagnetic levitation was used for density and surface tension studies. The results obtained are compared with experimental and calculated data from literature for pure aluminum.

scholarly journals Thermal conductivity of insulating refractory materials: comparison of steady-state and transient measurement methods

Open Ceramics ◽  
2021 ◽  
pp. 100118
Author(s):  
Diana Vitiello ◽  
Benoit Nait-Ali ◽  
Nicolas Tessier-Doyen ◽  
Thorsten Tonnesen ◽  
Luís Laím ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Measurement Methods ◽  
Refractory Materials ◽  
Transient Measurement

Design of a Steady-State, Parallel-Plate Thermal Conductivity Apparatus for Nanofluids and Comparative Measurements With Transient HWTC Apparatus

2010 ◽  
Author(s):  
Milivoje M. Kostic ◽  
Casey J. Walleck
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Parallel Plate ◽  
Measurement Method ◽  
Mixture Theory ◽  
Hot Wire ◽  
Electro Magnetic ◽  
Magnetic Phenomena ◽  
Thermal Conductivities

A steady-state, parallel-plate thermal conductivity (PPTC) apparatus has been developed and used for comparative measurements of complex POLY-nanofluids, in order to compare results with the corresponding measurements using the transient, hotwire thermal conductivity (HWTC) apparatus. The related measurements in the literature, mostly with HWTC method, have been inconsistent and with measured thermal conductivities far beyond prediction using the well-known mixture theory. The objective was to check out if existing and well-established HWTC method might have some unknown issues while measuring TC of complex nano-mixture suspensions, like electro-magnetic phenomena, undetectable hot-wire vibrations, and others. These initial and limited measurements have shown considerable difference between the two methods, where the TC enhancements measured with PPTC apparatus were about three times smaller than with HWTC apparatus, the former data being much closer to the mixture theory prediction. However, the influence of measurement method is not conclusive since it has been observed that the complex nano-mixture suspensions were very unstable during the lengthy steady-state measurements as compared to rather quick transient HWTC method. The nanofluid suspension instability might be the main reason for very inconsistent results in the literature. It is necessary to expend investigation with more stable nano-mixture suspensions.

scholarly journals Improving the quality of alumina-containing sinter using water-cooled furnace shell

2012 ◽  
Vol 44 (3) ◽  
pp. 281-286
Author(s):  
A.V. Aleksandrov ◽  
V.V. Aleksandrov
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Heat Exchange ◽  
Energy Balance ◽  
Cold Water ◽  
Sintering Temperature ◽  
Radiant Heat ◽  
Thermal Processes ◽  
Technical Solutions

This article deals with the use of computer modeling to develop technical solutions to ensure better quality of alumina-containing sinter. The simulation accounted for the influence of the feed materials on the thermal processes in the furnace. The energy balance (including thermal conductivity, heat convection and radiant heat exchange) was solved assuming steady state. A good correlation was observed for the actual and calculated temperatures of the solids and gases, with less than 15% discrepancy. Using the model of the furnace investigated the possibility of lowering the temperature of sintering by removing heat from the outside of the furnace shell. To reduce the sintering temperature to 1000 ?C length of the refractory lined steel is 5 m, the height of the lining should not exceed - 0.06 m, the required rate of cold water - 54.7 m3/h

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