scholarly journals Transient thermal streses in a circular disk with a hole due to a rotating heat source.

1991 ◽  
Vol 57 (533) ◽  
pp. 53-58
Author(s):  
Takahito GOSHIMA ◽  
Kaju MIYAO
Keyword(s):  
Heat Source ◽  
Circular Disk ◽  
Transient Thermal

Transient Thermal Stresses on a Finite Disk Due to a Continuous Point Heat Source

1970 ◽  
Vol 92 (2) ◽  
pp. 357-365 ◽  
Author(s):  
T. R. Hsu
Keyword(s):  
Heat Source ◽  
Thermal Stresses ◽  
Circular Disk ◽  
Transient Temperature ◽  
Point Heat Source ◽  
Finite Radius ◽  
Transient Temperature Distribution ◽  
Instantaneous Point ◽  
Continuous Point ◽  
Transient Thermal

This paper contains exact solutions for the transient temperature distribution and the associated quasi-static thermal stresses and deformations which arise in a thin circular disk of finite radius subjected to a continuous point heat source acting on its periphery. It has been proven in this paper that the solutions of this type of problem may be obtained by integrating the time variable of the corresponding solutions in the case of an instantaneous point heat source. The solutions are given in the form of double infinite series and graphical representations of the solutions in dimensionless terms are included. Reference is made to methods of applying the solutions to shapes other than disks. The solutions are pertinent to problems which occur in welding engineering and modern nuclear technology.

scholarly journals Modeling of an Integrated Thermoelectric Generation–Cooling System for Thermoelectric Cooler Waste Heat Recovery

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4691
Author(s):  
Jia Yu ◽  
Qingshan Zhu ◽  
Li Kong ◽  
Haoqing Wang ◽  
Hongji Zhu
Keyword(s):  
Steady State ◽  
Heat Source ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Cooling System ◽  
Thermoelectric Cooler ◽  
Thermoelectric Generation ◽  
Maximum Value ◽  
Transient Thermal

This paper focuses on the problem of thermoelectric cooler waste heat recovery and utilization, and proposes taking the waste heat together with the original heat source as the input heat source of the integrated thermoelectric generation–cooling system. By establishing an analytic model of this integrated thermoelectric generation–cooling system, the steady-state and transient thermal effects of this system are analyzed. The steady-state analysis results show that the thermoelectric generator’s actual heat source is about 20% larger than the intrinsic heat source. The transient analysis results prove that the current of thermoelectric power generation and the cold end temperature of the system show a nonlinear change rate with time. The cold end temperature of the system has a maximum value. Under different intrinsic heat sources, this maximum value can be reached between 1 s and 2.5 s.

scholarly journals Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1860 ◽  
Author(s):  
Anton Alexeev ◽  
Grigory Onushkin ◽  
Jean-Paul Linnartz ◽  
Genevieve Martin
Keyword(s):  
Heat Source ◽  
Transient Analysis ◽  
Thermal Power ◽  
Finite Element Models ◽  
Heat Sources ◽  
Thermal Measurements ◽  
Thermal Transient ◽  
Transient Thermal ◽  
Transient Measurements

Thermal transient testing is widely used for LED characterization, derivation of compact models, and calibration of 3D finite element models. The traditional analysis of transient thermal measurements yields a thermal model for a single heat source. However, it appears that secondary heat sources are typically present in LED packages and significantly limit the model’s precision. In this paper, we reveal inaccuracies of thermal transient measurements interpretation associated with the secondary heat sources related to the light trapped in an optical encapsulant and phosphor light conversion losses. We show that both have a significant impact on the transient response for mid-power LED packages. We present a novel methodology of a derivation and calibration of thermal models for LEDs with multiple heat sources. It can be applied not only to monochromatic LEDs but particularly also to LEDs with phosphor light conversion. The methodology enables a separate characterization of the primary pn junction thermal power source and the secondary heat sources in an LED package.

Using Linear Superposition to Solve Multiple Heat Source Transient Thermal Problems

2007 ◽  
Author(s):  
David T. Billings ◽  
Roger P. Stout
Keyword(s):  
Heat Source ◽  
Transient Response ◽  
Response Curves ◽  
Linear Superposition ◽  
Circuit Simulator ◽  
Set Up ◽  
The Time Domain ◽  
The Individual ◽  
Transient Thermal ◽  
Application Engineer

For many years engineers have been using linear superposition to solve steady state thermal problems with multiple-heat-source systems. Predicting transient response of single-heat-source systems has been performed using R-C Foster networks with reasonable success. In most real applications there are multiple heat sources that are interacting perhaps in very complex ways in the time domain. Being able to simulate these interactions using a spreadsheet tool or a circuit simulator may be very advantageous to a device or application engineer designing or evaluating an application design. Using an RC-network model of a system to represent the individual transient response curves, we’ll show how to do this bookkeeping (and all the other calculations) for a simple system using Microsoft Excel. We’ll also see how to set up this sort of problem in a circuit simulator.

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