Temperature profiles in the earth of importance to deep electrical conductivity models

1987 ◽  
Vol 125 (2-3) ◽  
pp. 255-284 ◽  
Author(s):  
Vladimír Čermák ◽  
Marcela Laštovičková
Keyword(s):  
Electrical Conductivity ◽  
Temperature Profiles ◽  
The Earth ◽  
Conductivity Models

Electrical conductivity anomalies in the earth

1978 ◽  
Vol 3 (3) ◽  
pp. 225-253 ◽  
Author(s):  
Yoshimori Honkura
Keyword(s):  
Electrical Conductivity ◽  
The Earth ◽  
Conductivity Anomalies

Analytical Electrical Conductivity Models for Single-Phase and Multi-Phase Fractal Porous Media

Fractals ◽  
2021 ◽  
Author(s):  
Wenhui Song ◽  
Masa Prodanovic ◽  
Jun Yao ◽  
Kai Zhang ◽  
Qiqi Wang
Keyword(s):  
Electrical Conductivity ◽  
Porous Media ◽  
Single Phase ◽  
Multi Phase ◽  
Conductivity Models

Use of Fuel Assembly/Backfill Gas Effective Thermal Conductivity Models to Predict Basket and Fuel Cladding Temperatures Within a Rail Package During Normal Transport

2006 ◽  
Author(s):  
Miles Greiner ◽  
Kishore Kumar Gangadharan ◽  
Mithun Gudipati
Keyword(s):  
Thermal Conductivity ◽  
Fuel Assembly ◽  
Effective Thermal Conductivity ◽  
Wall Temperature ◽  
Experimental Studies ◽  
Temperature Profiles ◽  
Fuel Cladding ◽  
Dimensional Finite Element ◽  
Normal Transport ◽  
Conductivity Models

Two-dimensional finite element thermal simulations of a generic rail package designed to transport twenty-one spent PWR assemblies were performed for normal transport conditions. Effective thermal conductivity models were employed within the fuel assembly/backfill gas region. Those conductivity models were developed by other investigators assuming the basket wall temperature is uniform. They are typically used to predict the maximum fuel cladding temperature near the package center. The cladding temperature must not exceed specified limits during normal transport. This condition limits the number and heat generation rate of fuel assembles that can transported. The current work shows the support basket wall temperatures in the periphery of the package are highly non-uniform. Moreover the thermal resistance of those regions significantly affects the maximum fuel clad temperature near the package center. This brings the validity of the fuel/backfill gas thermal conductivity models into question. The non-uniform basket wall temperature profiles quantified in this work will be used in future numerical and experimental studies to develop new thermal models of the fuel assembly/backfill gas regions. This will be an iterative process, since the assembly/backfill model affects the predicted basket wall temperature profiles.

A "SELF-CONSISTENT SOLUTION" METHOD FOR DETERMINING THE ELECTRICAL CONDUCTIVITY IN THE SUBSURFACE REGIONS OF THE EARTH

1964 ◽  
Vol 1 (3) ◽  
pp. 206-210
Author(s):  
Tomiya Watanabe
Keyword(s):  
Electrical Conductivity ◽  
Boundary Conditions ◽  
Solution Method ◽  
Magnetic Method ◽  
Entire Surface ◽  
Conductivity Distribution ◽  
The Earth ◽  
Self Consistent ◽  
Consistent Solution ◽  
The Magnetic Field

The assumptions on which the so-called magneto-telluric method to determine the subsurface conductivity of the earth is based are examined and it is shown how the method can be revised to get rid of those assumptions which are not necessarily legitimate. The principle of this revised or generalized magneto-telluric method is that the magnetic and telluric field components which observation can provide over the entire surface of the earth are more than sufficient viewed as boundary conditions to determine the electromagnetic field inside the earth with a prescribed conductivity distribution and, therefore, the extra boundary conditions can be consistent with each other only by the correctly prescribed (or chosen) distribution of electrical conductivity. The purely magnetic method to determine the conductivity, which relies on the assumption that the magnetic field in space above the surface of the earth, is a potential field, is also revised to free it of the assumption which, does not hold true unconditionally.

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