An exact solution for thermal analysis of a cylindrical object using hyperbolic thermal conduction model

2017 ◽  
Vol 24 (6) ◽  
pp. 909-920
Author(s):  
S. Saedodin ◽  
M. S. M. Barforoush
Keyword(s):  
Thermal Analysis ◽  
Exact Solution ◽  
Thermal Conduction ◽  
Conduction Model ◽  
Cylindrical Object

Thermal Analysis of Expressway Considering Wind Effect

2013 ◽  
Vol 419 ◽  
pp. 895-904
Author(s):  
X. Cao ◽  
H. Miyashita ◽  
T. Kako ◽  
Z. Zhang ◽  
B. Song
Keyword(s):  
Mathematical Model ◽  
Thermal Analysis ◽  
Thermal Conduction ◽  
Computer Calculation ◽  
Basic Mechanism ◽  
Weather Data ◽  
Wind Effect ◽  
Fortran Language ◽  
Explicit Finite Difference ◽  
Explicit Finite Difference Method

This paper reports a method of thermal analysis of expressway and the results of analysis of four expressways currently used in Japan. The authors built a mathematical model based on the principle of thermal conduction. For the boundary conditions in this mathematical model the influence of solar radiation, wind and air temperature etc. are taken into consideration. Explicit finite difference method is used in the analysis. The authors made an analysis program in Fortran language. Four main expressways distributing from the northern to the southern in Japan are chosen as the objects of this study. The observed weather data of the hottest days experienced by these expressways during the past 30 years is input into the computer calculation. The basic mechanism of expressway temperature change and effect factors are illuminated. The results are reported and discussed.

scholarly journals An application of pulsed infrared thermal imaging in the diagnosis of diabetic microangiopathy

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1473-1478
Author(s):  
Yanying Yin ◽  
Chen Li ◽  
Ge Song
Keyword(s):  
Lower Extremity ◽  
Atherosclerotic Plaque ◽  
Thermal Imaging ◽  
Thermal Conduction ◽  
Clinical Symptoms ◽  
Diabetic Microangiopathy ◽  
Conduction Model ◽  
Infrared Thermal Imaging ◽  
Imaging Technology ◽  
Working Principle

Diabetic microangiopathy is an important cause of morbidity and mortality of diabetes foot ulcers. Its early detection is very important for early intervention avoiding severe clinical symptoms. In this article, theoretical study on a pulsed infrared thermal imaging technology detecting early diabetic microangiopathy in lower extremity was carried out. The working principle of pulsed infrared thermal imaging technology was described and the 3-D thermal conduction model for atherosclerotic plaque in microvessel of distal lower extremity using pulsed infrared thermal imaging technology was established and calculated. The effect of atherosclerotic plaque geometry size including length and thickness to the measurement parameter was studied, and the influence law has been got, which can provide a theoretical basis for the diagnosis of diabetic microangiopathy using pulsed infrared thermal imaging technology.

Improvement of Thermal Conductivity for Carbon Fabric Composites Base on the Fabric Structure

2021 ◽  
Vol 1037 ◽  
pp. 161-166
Author(s):  
Phone Thant Kyaw ◽  
Pyae Phyo Maung ◽  
Galina V. Malysheva
Keyword(s):  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Thermal Load ◽  
Thermal Conduction ◽  
Thermal Calculation ◽  
Carbon Fabric ◽  
Fabric Structure ◽  
Fabric Composites ◽  
Load Calculation ◽  
Fabric Structures

This paper presents the development of methods for improving the thermal conductivity of fiber reinforcing materials based on the fabric structures. The thermal analysis of fabric structure in thermal load calculation is performed by Fourier’s Law of Thermal Conduction and Steady-State Thermal calculation in Siemens NX. This study leads to the development of thermal conductivity in manufacturing technology of fiber reinforcing materials. Keywords: Thermal conductivity, fabric structure, polymer composite materials

Thermal conduction model of metal and ceramics

2009 ◽  
Vol 35 (8) ◽  
pp. 3259-3268 ◽  
Author(s):  
Yoshihiro Hirata
Keyword(s):  
Thermal Conduction ◽  
Conduction Model

Refined bond-based peridynamics for thermal diffusion

2019 ◽  
Vol 36 (8) ◽  
pp. 2557-2587 ◽  
Author(s):  
Xin Gu ◽  
Qing Zhang ◽  
Erdogan Madenci
Keyword(s):  
Heat Conduction ◽  
Differential Operator ◽  
Thermal Conduction ◽  
Calibration Procedure ◽  
Classical Solutions ◽  
Refined Model ◽  
Conduction Model ◽  
Content Type ◽  
Integral Forms ◽  
Cracked Structures

Purpose This paper aims to review the existing bond-based peridynamic (PD) and state-based PD heat conduction models, and further propose a refined bond-based PD thermal conduction model by using the PD differential operator. Design/methodology/approach The general refined bond-based PD is established by replacing the local spatial derivatives in the classical heat conduction equations with their corresponding nonlocal integral forms obtained by the PD differential operator. This modeling approach is representative of the state-based PD models, whereas the resulting governing equations appear as the bond-based PD models. Findings The refined model can be reduced to the existing bond-based PD heat conduction models by specifying particular influence functions. Also, the refined model does not require any calibration procedure unlike the bond-based PD. A systematic explicit dynamic solver is introduced to validate 1 D, 2 D and 3 D heat conduction in domains with and without a crack subjected to a combination of Dirichlet, Neumann and convection boundary conditions. All of the PD predictions are in excellent agreement with the classical solutions and demonstrate the nonlocal feature and advantage of PD in dealing with heat conduction in discontinuous domains. Originality/value The existing PD heat conduction models are reviewed. A refined bond-based PD thermal conduction model by using PD differential operator is proposed and 3 D thermal conduction in intact or cracked structures is simulated.

scholarly journals Homogenized thermal conduction model for particulate foods

2002 ◽  
Vol 41 (12) ◽  
pp. 1141-1150 ◽  
Author(s):  
Francisco Chinesta ◽  
Rafael Torres ◽  
Antonio Ramon ◽  
Mari Carmen Rodrigo ◽  
Miguel Rodrigo
Keyword(s):  
Thermal Conduction ◽  
Conduction Model

Thermal Analysis of Capacitor Discharge Welding and its Correlation With Observed Stress Wave Emission (SWE)

1977 ◽  
Vol 99 (4) ◽  
pp. 379-386
Author(s):  
U. C. Paek ◽  
S. J. Vahaviolos ◽  
G. E. Kleinedler
Keyword(s):  
Thermal Analysis ◽  
Stress Wave ◽  
Weld Zone ◽  
Frequency Discrimination ◽  
Signal Frequency ◽  
Depth Of Penetration ◽  
Conduction Model ◽  
Capacitor Discharge ◽  
Wave Emission ◽  
Capacitor Discharge Welding

A theoretical approach to thermal analysis of capacitor discharge welding is presented. The weld current is divided into three segments (premelting, melting, and postmelting) and each is analyzed with a one dimensional heat conduction model. From this analysis, normalized parameter values are plotted to provide an estimate of the thermal time constant of welding and the extent of melting. The predicted weld zone depth of penetration was experimentally verified with metallographic data. Similarly, using signal frequency discrimination techniques, it was found that Stress Wave Emission (SWE) techniques could be adapted to measure the parameters of the above three pulse segments (tm, te, tc) accurately and in real time. Theoretical and experimental metallographic and SWE results are in good agreement.

scholarly journals Thermal Analysis Impact for Hydrates Formation in Oil  & Gas Pipelines

2020 ◽  
Vol 1 (1) ◽  
pp. 16-19
Author(s):  
Tommaso De Pippo ◽  
Tatiana Vasco ◽  
António José
Keyword(s):  
Thermal Analysis ◽  
Thermal Conduction ◽  
Piping System ◽  
Gas Pipelines ◽  
Operating Life ◽  
Gas Industry ◽  
Temperature Ranges ◽  
The Impact ◽  
Oil Gas

The  Oil  &  Gas  industry  has  grown  and  new  discoveries  and  technologies  have  risen  in  order  to  accommodate  the  dynamics   of  such  industry.  With  investments  ranging  billions  of  US  Dollars  is  mandatory  to  create  measures  to  avoid  pressure  vs   temperature  related  issues  during  the  extraction,  transportation  and  of  the  crude  in  order  to  minimize  losses  and  maximize   the  profit  (Borsani,  2001).  Hydrates  in  oil&  gas  pipelines  poses  a  very  big  issue  to  the  industry.  Hydrates  are  normally  formed   when  the  adequate  conditions  (gas,  water,  compatible  pressures  and  temperature  ranges)  are  present.  They  are  in  the   market  several  methodologies  to  prevent  the  evolution  or  emerging  of  hydrates.  An  adequate  thermal  study  during  the   design  of  the  pipeline  and  its  insulation  layers,  constitutes  a  greater  value  on  the  path  to  avoid  hydrates  formation  during   the  pipeline  operating  life.  On  This  paper  the  study  is  dedicated  on  the  impact  of  thermal  analysis  in  one  of  the  pipelines   operating  in  one  of  the  Angolans  Offshore  fields.  COSMOS  Geostar  is  the  tool  used  for  the  investigation.  The  study  was   conducted  in  a  pipeline  considering  the  thermal  conduction  through  a  normal  pipe  section  and  the  thermal  conduction   through  a  field  joint.  This  project  has  proven  the  efficiency  of  COSMOS  in  assisting  on  the  determination  of  a  proper  type,   nature  and  size  of  insulation  to  be  applied  in  a  certain  piping  system  for  crude  oil  production  and/or  transport.    

scholarly journals Microwave Absorption in Layered Media: Application to Landmine Detection

2000 ◽  
Vol 53 (5) ◽  
pp. 723 ◽  
Author(s):  
J. A. Hermann
Keyword(s):  
Thermal Properties ◽  
Microwave Absorption ◽  
Time Evolution ◽  
Microwave Radiation ◽  
Thermal Energy ◽  
Thermal Conduction ◽  
Landmine Detection ◽  
Composite Media ◽  
Conduction Model ◽  
One Dimensional

The absorption of microwave radiation and subsequent thermal conduction by simple composite media, consisting of parallel layers with disparate thermal properties,is analysed.The solutions for a one-dimensional conduction model are used to investigate the time evolution and distribution of thermal energy within moisture-laden soils containing non-absorbing objects.The application of these results to the detection of landmines is discussed and evaluated.

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