Analog Methods for Study of Transient Heat Flow in Solids with Temperature‐Dependent Thermal Properties

1955 ◽  
Vol 26 (1) ◽  
pp. 129-130 ◽  
Author(s):  
Norman E. Friedmann
Keyword(s):  
Thermal Properties ◽  
Heat Flow ◽  
Temperature Dependent ◽  
Transient Heat Flow

The Effect of Coatings on the Steady-State and Short Time Constriction Resistance for an Arbitrary Axisymmetric Flux

1985 ◽  
Vol 107 (1) ◽  
pp. 33-38 ◽  
Author(s):  
J. R. Dryden ◽  
M. M. Yovanovich ◽  
A. S. Deakin
Keyword(s):  
Thermal Properties ◽  
Steady State ◽  
Heat Flow ◽  
Contact Spot ◽  
One Dimensional ◽  
Constriction Resistance ◽  
Transient Heat Flow ◽  
Flow Through ◽  
Short Time ◽  
Short Times

The effect of a coating upon the short-time and steady-state constriction resistance is analyzed for an arbitrary axisymmetric contact spot flux. At very short times the expression obtained for R is identical to the expression for one-dimensional transient heat flow through a two-layer wall. At steady-state, the results of the analysis predict that the effect of the coating are mainly dependent on the relative thermal properties of the coating and substrate. The limiting cases, where the coating thickness approaches either zero or infinity, are discussed.

Temperature-dependent transformation thermotics for unsteady states: Switchable concentrator for transient heat flow

2016 ◽  
Vol 380 (18-19) ◽  
pp. 1641-1647 ◽  
Author(s):  
Ying Li ◽  
Xiangying Shen ◽  
Jiping Huang ◽  
Yushan Ni
Keyword(s):  
Heat Flow ◽  
Temperature Dependent ◽  
Transient Heat Flow

Threshold Energies for the Melting of Si And Al during Pilsed-Laser Irradiation

1984 ◽  
Vol 35 ◽  
Author(s):  
C.K. Ong ◽  
H.S. Tan ◽  
E.H. Sin
Keyword(s):  
Experimental Data ◽  
Thermal Properties ◽  
Heat Flow ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Temperature Dependent ◽  
Melting Threshold ◽  
Experimental Values ◽  
Threshold Energies

ABSTRACTThe heat flow calculations have been performed to obtain the threshold energies for the melting of Si and Al during pulsed-laser irradiations under various laser conditions. The temperature dependent optical and thermal properties of the solids are deduced from the available experimental data. The melting threshold energies calculated for the solids are within the accuracy of the experimental values.

Analysis of Tempering and Rehardening for Grinding of Hardened Steels

1991 ◽  
Vol 113 (4) ◽  
pp. 388-394 ◽  
Author(s):  
O. B. Fedoseev ◽  
S. Malkin
Keyword(s):  
Thermal Properties ◽  
Heat Source ◽  
Hardened Steel ◽  
Temperature History ◽  
Hardness Distribution ◽  
Temperature Dependent ◽  
Thermally Activated ◽  
Reaction Equations ◽  
Rate Controlling Step ◽  
Good Agreement

An analysis is presented to predict the hardness distribution in the subsurface of hardened steel due to tempering and rehardening associated with high temperatures generated in grinding. The grinding temperatures are modeled with a triangular heat source at the grinding zone and temperature-dependent thermal properties. The temperature history, including the effect of multiple grinding passes, is coupled with thermally activated reaction equations for tempering and for reaustenitization which is the rate controlling step in rehardening. Experimental results from the literature are found to be in good agreement with the analytical predictions.

scholarly journals Human Machine and Thermoelectric Energy Scavenging for Wearable Devices

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Vladimir Leonov
Keyword(s):  
Thermal Properties ◽  
Heat Flow ◽  
Thermal Resistance ◽  
Wearable Devices ◽  
The Body ◽  
Energy Scavenging ◽  
Wearable Electronics ◽  
Ambient Temperatures ◽  
Thermoelectric Energy ◽  
Temperature Heat

Thermal properties of humans were studied in the case where a small-size energy scavenger is placed on the body. In such a case, the human being serves as a heat source for the thermopile of the scavenger, but the latter serves as a thermally insulating object. As a result, the body properties, namely, the skin temperature, heat flow, and thermal resistance locally change. This is the result of redirection of heat flow inside the body to colder zones because of thermal insulation provided by the scavenger. Increased thermal resistance of human body, in turn, affects the design of the scavenger. The analysis of such scavenger performed for ambient temperatures of 0°C to 25°C shows that it could reach competitive performance characteristics and replace batteries in low-power wearable electronics. A simulated power of up to 60 μW/cm2 at 0°C has been validated by using wearable thermoelectric modules.

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