Numerical simulation of heat transfer in loaded heat treatment furnaces

2004 ◽  
Vol 120 ◽  
pp. 545-553
Author(s):  
J. Kang ◽  
Y. K. Rong ◽  
W. Wang
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Heating Process ◽  
View Factor ◽  
Direct Integral ◽  
3 Dimensional ◽  
Prediction And Control ◽  
Heat Transfer Simulation ◽  
Transfer Problems ◽  
And Control

Heat transfer simulation within heat treatment furnaces is of great significance for the prediction and control of the ultimate microstructure, properties and dimensional stability of the workpieces and even the performance of furnaces. In this paper a set of models is proposed to solve heat transfer problems in a loaded furnace, including radiation, convection and conduction. Furthermore, a 3-dimensional algorithm based on finite difference method (FDM) is presented with a complete system for process simulation system. In the radiation module, view factor is calculated by direct integral method for all element pairs exposed to each other based on the blocking judgment. Combustion in gas-fired furnace and PID control are also included in the furnace model. The heat transfer models are integrated with furnace model to simulate the heating process of workpieces. Temperature distribution in workpiece and its variation with time are predicted by the system. An experiment is carried out for the validation of the system.

scholarly journals A Numerical Thermal Analysis of the Heating Process of Large Size Forged Ingots

2018 ◽  
Vol 941 ◽  
pp. 2278-2283
Author(s):  
Nima Bohlooli Arkhazloo ◽  
Farzad Bazdidi-Tehrani ◽  
Morin Jean-Benoit ◽  
Mohammad Jahazi
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Conjugate Heat Transfer ◽  
Computational Cost ◽  
Three Dimensional ◽  
Temperature Evolution ◽  
Heating Process ◽  
Computational Domain ◽  
Cfd Model ◽  
Large Size

Simulation and analysis of thermal interactions during heat treatment is of great importance for accurate prediction of temperature evolution of work pieces and consequently controlling the final microstructure and mechanical properties of products. In the present study, a three-dimensional CFD model was employed to predict the heating process of large size forged ingots inside an industrial gas-fired heat treatment furnace. One-ninth section of a loaded furnace, including details such as fixing bars and high-momentum cup burners, was employed as the computational domain. The simulations were conducted using the ANSYS-FLUENT commercial CFD package. The k-ε, P-1 and Probability Density Function (PDF) in the non-premix combustion, as low computational cost numerical approaches were employed to simulate the turbulent fluid flow, thermal radiation, combustion and conjugate heat transfer inside the furnace. Temperature measurement at different locations of the forged ingot surfaces were used to validate the transient numerical simulations. Good agreement was obtained between the predictions of the CFD model and the experimental measurements, demonstrating the reliability of the proposed approach and application of the model for process optimization purposes. Detailed analysis of conjugate heat transfer together with the turbulent combustion showed that the temperature evolution of the product was significantly dependant on the furnace geometry and the severity of turbulent flow structures in the furnace.

Dynamic Model for Calculating Heating Patterns During Microwave Sintering

1992 ◽  
Vol 269 ◽  
Author(s):  
James Tucker ◽  
Ray Smith ◽  
Magdy F. Iskander ◽  
Octavio M. Andrade
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Microwave Sintering ◽  
Companion Paper ◽  
Heating Process ◽  
Transfer Program ◽  
Ceramic Samples ◽  
Step Procedure ◽  
Picket Fence ◽  
And Control

ABSTRACTAnalysis of dynamic development of heating patterns during microwave sintering provides vital information on the evolution of the heating process and the contributions from the various components in a complex sintering arrangement (picket fence) to the heat-transfer mechanism. Measured heating patterns often provide overall effects, and it is difficult to isolate and control the various contributions. To this end, results from numerical simulation may be significant.In this paper we describe a thermal model that calculates the temperature distribution in ceramic samples and insulation under realistic sintering conditions. The calculation process involves a two-step procedure. The first step is to calculate the microwave power deposition in the sample and surrounding insulation. 3D FDTD calculations described in a companion paper are used for this purpose [1] The other step involves calculation of the temperature distribution using a 3D finite-difference heat-transfer program developed in our department.Results illustrating the effect of thickness of insulation and the placement of SiC rods in picket-fence arrangement are presented. Also, the need to measure additional parameters such as thermal conductivity and density of green samples as a function of temperature during sintering is discussed.

Research on Gradient Heat Treatment of Dual-Property Disk for Alloy FGH96

2013 ◽  
Vol 747-748 ◽  
pp. 783-787
Author(s):  
Yu Wang ◽  
Jin Wen Zou ◽  
Guo Qing Zhang ◽  
Wu Xiang Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Treatment ◽  
Transient Temperature ◽  
Heating Process ◽  
Fixture Design ◽  
Dual Property ◽  
Transient Temperature Field ◽  
Heat Treated ◽  
Treatment Experiment

The transient temperature field in the dual-property disk of alloy FGH96 was investigated during the solution heating process of the gradient heat treatment by numerical simulation. The temperature curves for the different locations of the disk were attained. Then, the gradient heat treatment experiment was carried out, and the heat profiles were obtained. The numerical and the experimental results were almost consistent. The method of heat transfer for the bore of the disk was changed evidently through effective fixture design during the gradient heat treatment. The gradient of temperature (ΔT) can reach 121 or more, which lead to a supersolvus heat treated rim and subsolvus heat treated bore for the disk.

scholarly journals Parametric Integral Equations Systems Method In Solving Unsteady Heat Transfer Problems For Laser Heated Materials

2015 ◽  
Vol 9 (3) ◽  
pp. 167-172
Author(s):  
Dominik Sawicki ◽  
Eugeniusz Zieniuk
Keyword(s):  
Heat Transfer ◽  
Numerical Methods ◽  
Integral Equations ◽  
Time Discretization ◽  
Heating Process ◽  
Unsteady Heat Transfer ◽  
High Power Lasers ◽  
Shape Approximation ◽  
Transfer Problems ◽  
Laser Heated

Abstract One of the most popular applications of high power lasers is heating of the surface layer of a material, in order to change its properties. Numerical methods allow an easy and fast way to simulate the heating process inside of the material. The most popular numerical methods FEM and BEM, used to simulate this kind of processes have one fundamental defect, which is the necessity of discretization of the boundary or the domain. An alternative to avoid the mentioned problem are parametric integral equations systems (PIES), which do not require classical discretization of the boundary and the domain while being numerically solved. PIES method was previously used with success to solve steady-state problems, as well as transient heat transfer problems. The purpose of this paper is to test the efficacy of the PIES method with time discretization in solving problem of laser heating of a material, with different pulse shape approximation functions.

Heat Transfer Simulation Using PSpice

2003 ◽  
Author(s):  
Shuhui Li ◽  
Rajab Challoo ◽  
Robert A. McLauchlan
Keyword(s):  
Heat Transfer ◽  
Energy Flow ◽  
Large Scale ◽  
Network Models ◽  
Heat Transfer Analysis ◽  
Electric Circuits ◽  
Transfer Equations ◽  
Heat Transfer Simulation ◽  
Almost All ◽  
Transfer Problems

Heat transfer considerations are important in almost all areas of technology. However, heat transfer analysis can be very difficult for complicated systems such as very large-scale integrated (VLSI) electric circuits and systems, making the simulation an attractive technique for studying heat transfer of those systems. This paper presents methods of heat transfer simulation using PSpice. First, typical heat transfer modes are discussed and heat transfer equations are presented. Then, equivalent electrical models are developed, and PSpice representations of those models are investigated. Finite-difference RC network models are developed and used for the simulation of complicated heat transfer problems using PSpice. Two typical heat transfer examples are studied. Simulations are performed to investigate and study the heat transfer and energy flow of the two examples using PSpice.

An insight into Case Management and Challenges in Veteran Suicide Prevention

2020 ◽  
pp. 14-25
Author(s):  
Tamara Green
Keyword(s):  
Case Management ◽  
Suicide Prevention ◽  
Suicide Risk ◽  
Digital Transformation ◽  
Prevention Science ◽  
Historical Records ◽  
Military Members ◽  
Prediction And Control ◽  
And Control ◽  
Insight Into

Much of the literature, policies, programs, and investment has been made on mental health, case management, and suicide prevention of veterans. The Australian “veteran community is facing a suicide epidemic for the reasons that are extremely complex and beyond the scope of those currently dealing with them.” (Menz, D: 2019). Only limited work has considered the digital transformation of loosely and manual-based historical records and no enablement of Artificial Intelligence (A.I) and machine learning to suicide risk prediction and control for serving military members and veterans to date. This paper presents issues and challenges in suicide prevention and management of veterans, from the standing of policymakers to stakeholders, campaigners of veteran suicide prevention, science and big data, and an opportunity for the digital transformation of case management.

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