A theoretical model for effective thermal conductivity of multicore power cables

2012 ◽  
Vol 87 ◽  
pp. 10-12 ◽  
Author(s):  
G. De Mey ◽  
V. Chatziathanasiou
Keyword(s):  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Power Cables

Porosity and Effective Thermal Conductivity of Wire Screens

1990 ◽  
Vol 112 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Won Soon Chang
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Present Model ◽  
Model Based ◽  
Wire Screen ◽  
Simple Theoretical Model ◽  
Parallel Conduction ◽  
The Wire

A simple theoretical model based on combined series and parallel conduction for the effective thermal conductivity of fluid-saturated screens has been developed. The present model has been compared with the existing correlations and experimental data available in literature, and it has been found that the model is effective in predicting thermal conductivity. The study also demonstrates that it is important to include the actual thickness of the wire screen in order to calculate the porosity accurately.

A theoretical model for the effective thermal conductivity of silica aerogel composites

2018 ◽  
Vol 128 ◽  
pp. 1634-1645 ◽  
Author(s):  
Yan-Jun Dai ◽  
Yu-Qing Tang ◽  
Wen-Zhen Fang ◽  
Hu Zhang ◽  
Wen-Quan Tao
Keyword(s):  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Silica Aerogel

Comparison of Effective Thermal Conductivity of Hollow Fibers by Prediction Models and FE Method

2013 ◽  
Vol 440 ◽  
pp. 3-8
Author(s):  
Guo Cheng Zhu ◽  
Jiří Militký ◽  
Yan Wang ◽  
Juan Huang ◽  
Dana Kremenakova
Keyword(s):  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Prediction Models ◽  
Heating Surface ◽  
Theoretical Models ◽  
Hollow Fibers ◽  
Fe Method ◽  
Ansys Simulation ◽  
Regular Structures

In order to evaluate the effective thermal conductivity (ETC) of hollow fibers, three theoretical models (the parallel/series model, quadrate model and cylindrical model) and finite element method carried out by ANSYS simulation were studied. The results showed that different theoretical models gave quite different effective thermal conductivities. The results from theoretical models and simulations were completely identical in the case when models had regular structures and the heating surface was the same kind of material. The ETC of hollow fibers from all of theoretical models and simulations decreased exponentially with the increase of air volume content. In addition, the ETC of hollow fibers from the first theoretical model were a bit higher than the results from simulation, whereas those from the second theoretical model were smaller than the results from simulation, and those from the third theoretical model were identical to the results from simulation.

EFFECTIVE THERMAL CONDUCTIVITY OF NANOFLUIDS CONTAINING CYLINDRICAL NANOPARTICLES

2007 ◽  
Vol 06 (01) ◽  
pp. 45-49 ◽  
Author(s):  
JAMSHID SABBAGHZADEH ◽  
SADOLLAH EBRAHIMI
Keyword(s):  
Thermal Conductivity ◽  
Theoretical Model ◽  
Effective Thermal Conductivity ◽  
Experimental Results ◽  
Cylindrical Shape ◽  
Nanoparticle Diameter ◽  
Conductivity Of Nanotubes

We present a theoretical model for explaining the enhancement in the effective thermal conductivity of nanotubes (cylindrical shape particles) for use in nanotube-in-fluid suspensions. Our theoretical model shows that the effective thermal conductivity is decreased with cylindrical nanoparticle diameter, which agrees with experimental results. We also show that with the decrease of nanotube diameter, the thermal conductivity increases if the thickness of nanolayers increases. We provide a good estimation for the nanolayer's thickness which plays an important role in increasing the thermal conductivity.

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