Sequential Estimation of the Radial Temperature Variation in Overhead Power Cables

2021 ◽  
pp. 1-14
Author(s):  
Farith M. Absi Salas ◽  
Helcio R. B. Orlande ◽  
Luis A. M. C. Domingues ◽  
Carlos R. N. Barbosa
Keyword(s):  
Temperature Variation ◽  
Sequential Estimation ◽  
Power Cables ◽  
Radial Temperature

Stresses in a Metal Tube Under Both High Radial Temperature Variation and Internal Pressure

1954 ◽  
Vol 21 (2) ◽  
pp. 101-108
Author(s):  
Chieh-Chien Chang ◽  
Wen-Hwa Chu
Keyword(s):  
Stress Distribution ◽  
Temperature Variation ◽  
Modulus Of Elasticity ◽  
Coefficient Of Thermal Expansion ◽  
Metal Tube ◽  
Radial Temperature ◽  
Variation Of Parameters ◽  
Effects Of Temperature ◽  
Fundamental Equations ◽  
Very High

Abstract The paper treats the stress distribution in a metal tube which is subject to a very high radial temperature variation and pressure. The radial temperature distribution across the tube wall and the variations of the modulus of elasticity and the coefficient of thermal expansion are obtained from experimental data, and all these effects of temperature are taken into account in the calculations. The fundamental equations in the case of plane strain and plane stress can be formulated as the nonhomogeneous Whittaker differential equations. The corresponding solutions are obtained by the method of variation of parameters and in terms of Kummer series. An example is shown, and the stress distribution across the wall is given. For comparison, the stress distribution of the case of constant modulus of elasticity and coefficient of expansion is included.

A Thermo-Hydrodynamic Analysis of a Mechanical Face Seal

1992 ◽  
Vol 114 (4) ◽  
pp. 639-645 ◽  
Author(s):  
M. D. Pascovici ◽  
I. Etsion
Keyword(s):  
Boundary Conditions ◽  
Thermal Behavior ◽  
Temperature Variation ◽  
Energy Equation ◽  
Face Seal ◽  
Radial Temperature ◽  
Hydrodynamic Analysis ◽  
Implicit Equation ◽  
Face To Face ◽  
Mechanical Face Seal

A thermo-hydrodynamic analysis is performed for a face-to-face double seal configuration. Temperature and viscosity variations both across and along the sealing gap are considered and realistic boundary conditions are considered. The energy equation is solved analytically and the radial temperature variation is presented by an implicit equation. This approach enables analytical parametric investigation and gives better understanding of the effects of various parameters on the seal’s thermal behavior.

Thermal Buckling and Snapping of a Circular Ring

1971 ◽  
Vol 93 (4) ◽  
pp. 1245-1254
Author(s):  
David Burgreen
Keyword(s):  
Temperature Distribution ◽  
Temperature Variation ◽  
Circular Ring ◽  
Thermal Buckling ◽  
Uniform Temperature ◽  
Radial Temperature ◽  
Axial Temperature ◽  
Axisymmetric Temperature

An analysis is made of the thermal buckling of flat rings and of shallow conical rings which are subjected to an axisymmetric temperature distribution. It is found that flat rings can buckle when there is a radial temperature variation only. Conical rings are subject to instability and snapping in the presence of either an axial temperature variation alone, or a combined axial and radial temperature variation, of the proper magnitude. Expressions are developed which give the temperatures at which buckling and snapping take place, as well as the temperature over-lap in a full thermostatic cycle of increasing and decreasing temperatures. Bimetallic conical rings at uniform temperature are examined, and snapping temperatures are determined for this type element.

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