USE OF GENETIC ALGORITHMS IN THERMAL PROPERTY ESTIMATION: PART II - SIMULTANEOUS ESTIMATION OF THERMAL PROPERTIES

1998 ◽  
Vol 33 (2) ◽  
pp. 149-168 ◽  
Author(s):  
Sandrine Garcia ◽  
Jerome Guynn ◽  
Elaine P. Scott
Keyword(s):  
Genetic Algorithms ◽  
Thermal Properties ◽  
Thermal Property ◽  
Simultaneous Estimation ◽  
Property Estimation

scholarly journals Thermal properties of closed-cell aluminum foam with circular pores

2014 ◽  
Vol 18 (5) ◽  
pp. 1619-1624 ◽  
Author(s):  
Guo-Yun Lu ◽  
Bu-Yun Su ◽  
Zhi-Qiang Li ◽  
Zhi-Hua Wang ◽  
Wei-Dong Song ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Property ◽  
Cell Size ◽  
Aluminum Foam ◽  
Slight Effect ◽  
Apparent Thermal Conductivity ◽  
Closed Cell ◽  
Simulation Results

The thermal property of closed-cell aluminum foam is studied numerically and the effects of the distribution of the circular pore on the thermal property are studied theoretically. When the convection and radiation are ignored, the effects of porosity, cell size, and distribution forms of pore on the apparent thermal conductivity are investigated. Moreover, the effects of air in the pore on the thermal property are analyzed as well. Simulation results show that apparent thermal conductivity linearly increases with the increase of porosity, while the cell size and the distribution have negligible effects on the thermal property. By comparison, thermal conductivity of air has slight effect on thermal property of foamed aluminum in the context of small size pore.

Thermal property of an aggregation-induced emission fluorophore that forms metal–ligand complexes with Zn(ClO4)2 of salicylaldehyde azine-functionalized polybenzoxazine

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65635-65645 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Ruey-Chorng Lin ◽  
Jia-Huei Tu ◽  
Fang-Hsien Lu ◽  
Jin-Long Hong ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermal Property ◽  
Ring Opening ◽  
Zinc Ion ◽  
Ring Opening Polymerization ◽  
Aggregation Induced Emission ◽  
Metal Ligand

A salicylaldehyde azine-functionalized benzoxazine monomer formed zinc ion complexes not only improved the thermal properties but also facilitated ring-opening polymerization.

A numerical investigation of thermal property effects on melt pool characteristics in powder-bed electron beam additive manufacturing

2016 ◽  
Vol 232 (9) ◽  
pp. 1615-1627 ◽  
Author(s):  
Bo Cheng ◽  
Kevin Chou
Keyword(s):  
Thermal Conductivity ◽  
Electron Beam ◽  
Thermal Properties ◽  
Additive Manufacturing ◽  
Melting Point ◽  
Thermal Property ◽  
Manufacturing Process ◽  
Powder Bed ◽  
Melt Pool ◽  
Melt Pool Size

Powder-bed electron beam additive manufacturing has the potential to be a cost-effective alternative in producing complex-shaped, custom-designed metal parts using various alloys. Material thermal properties have a rather sophisticated effect on the thermal characteristics such as the melt pool geometry in fabrications, impacting the build part quality. The objective of this study is to achieve a quantitative relationship that can correlate the material thermal properties and the melt pool geometric characteristics in the electron beam additive manufacturing process. The motivation is to understand the interactions of material property effect since testing individual properties is insufficient because of the change of almost all thermal properties when switching from one to the other material. In this research, a full-factorial simulation experiment was conducted to include a wide range of the thermal properties and their combinations. A developed finite element thermal model was applied to perform electron beam additive manufacturing process thermal simulations incorporating tested thermal properties. The analysis of variance method was utilized to evaluate different thermal property effects on the simulated melt pool geometry. The major results are summarized as follows. (1) The material melting point is the most dominant factor to the melt pool size. (2) The role of the material thermal conductivity may outweigh the melting point and strongly affects the melt pool size, if the thermal conductivity is very high. (3) Regression equations to correlate the material properties and the melt pool dimension and shape have been established, and the regression-predicted results show a reasonable agreement with the simulation results for tested real-world materials. However, errors still exist for materials with a small melt pool such as copper.

On the Application of the Photoacoustic Method for the Determination of the Thermal Properties of Heat-Treated and Annealed Al-Li Alloy

2011 ◽  
Vol 319-320 ◽  
pp. 43-50
Author(s):  
M. Sivabharathy ◽  
P. Palanichamy ◽  
M. Vasudevan ◽  
P. Kalyanasundaram ◽  
K. Ramachandran
Keyword(s):  
Thermal Properties ◽  
Thermal Property ◽  
Depth Profile ◽  
Theoretical Basis ◽  
Profile Analysis ◽  
Depth Profile Analysis ◽  
Photoacoustic Method ◽  
Quantitative Measurements ◽  
Heat Treated

In this paper, the application of photoacoustic methods to study thermal properties of Al-Li alloy is described. The photoacoustic measurements are carried out for thermal properties on Al-Li alloy and studied for various thicknesses. The theoretical basis for quantitative measurements is discussed together with the advantages and limitations of these methods as compared with conventional measurements. Applications to spectroscopic and depth-profile analysis and also to thermal property measurements in Al-Li samples heat-treated at 755K per hour and annealed at 505K are discussed. The results are compared with literature values, and discussed.

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