Computer simulation of thermal analysis in heat-flux DSC applied to metal solidification

1992 ◽  
Vol 38 (9) ◽  
pp. 1949-1957 ◽  
Author(s):  
R. Ciach ◽  
W. Kapturkiewicz ◽  
W. Wolczynski ◽  
A. M. Zahra
Keyword(s):  
Thermal Analysis ◽  
Heat Flux ◽  
Computer Simulation ◽  
Metal Solidification ◽  
Heat Flux Dsc

An analysis of the factors affecting the peak shape and the quantitative reliability of a heat flux DSC cell

1985 ◽  
Vol 95 (2) ◽  
pp. 419-424 ◽  
Author(s):  
A. Marini ◽  
V. Berbenni ◽  
G. Flor ◽  
V. Massarotti ◽  
R. Riccardi
Keyword(s):  
Heat Flux ◽  
Peak Shape ◽  
Factors Affecting ◽  
Heat Flux Dsc

An alternative approach to thermal analysis using inverse problems in aluminum alloy welding

2017 ◽  
Vol 27 (3) ◽  
pp. 561-574 ◽  
Author(s):  
Elisan dos Santos Magalhaes ◽  
Cristiano Pedro da Silva ◽  
Ana Lúcia Fernandes Lima e Silva ◽  
Sandro Metrevelle Marcondes Lima e Silva
Keyword(s):  
Thermal Analysis ◽  
Heat Flux ◽  
Aluminum Alloy ◽  
Inverse Problems ◽  
Welding Process ◽  
Experimental Methodology ◽  
Function Technique ◽  
Content Type ◽  
Radiation Coefficient ◽  
Welding Processes

Purpose The purpose of this article is the determination of the temperature fields in a weld region has always been an obstacle to the improvement of welding processes. As an alternative, the use of inverse problems to determine the heat flux during the welding process allows an analysis of these processes. Design/methodology/approach This paper studies an alternative for the thermal analysis of the tungsten inert gas welding process on a 6,060 T5 aluminum alloy. For this purpose, a C++ code was developed, based on a transient three-dimensional heat transfer model. To estimate the amount of heat delivered to the plate, the specification function technique was used. Lab experiments were carried out to validate the methodology. A different experimental methodology is proposed to estimate the emissivity (radiation coefficient). Findings The maximum difference between experimental and numerical temperatures is lower than 5 per cent. The determined emissivity value for the aluminum 6,060 T5 presented a good agreement with literature values. The thermal fields were analyzed as function of the positive polarity. The specification function method proved to be an adequate tool for heat input estimation in welding analysis. Originality/value The proposed methodology proves to be a cheaper way to estimate the heat flux on the sample. The estimated power curves for the welding process are presented. The methodology to calculate the emissivity (radiation coefficient) was validated.

scholarly journals Improving the Heat Transfer Rate of Air Conditioning Condenser by Material Optimization

2021 ◽  
pp. 39-50
Author(s):  
A. A. Adegbola ◽  
O. A. Adeaga ◽  
A. O. Babalola ◽  
A. O. Oladejo ◽  
A. S. Alabi
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Heat Flux ◽  
Flow Rate ◽  
Transfer Rate ◽  
Air Conditioning ◽  
Static Pressure ◽  
Cfd Analysis ◽  
Condenser Tube ◽  
Total Heat Transfer

Air conditioning systems have condensers that remove unwanted heat from the refrigerant and transfer the heat outdoors. The optimization of the global exploit of heat exchanging devices is still a burdensome task due to different design parameters involved. There is need for more and substantial research into bettering cooling channel materials so as to ensure elevated performance, better efficiency, greater accuracy, long lasting and low cost heat exchanging. The aim of this research work is to improve the heat transfer rate of air conditioning condenser by optimizing materials for different tube diameters. Simulations using thermal analysis and Computational Fluid Dynamic (CFD) analysis were carried out to determine the better material and fluid respectively. The analysis was done using Analysis System software. Different parameters were calculated from the results obtained and graphs are plotted between various parameters such as heat flux, static pressure, velocity, mass flow rate and total heat transfer. The materials used for CFD analysis are R12 and R22, and for thermal analysis are copper and aluminium. From the CFD analysis, the result shows that R22 has more static pressure, velocity, mass flow rate and total heat transfer than R12 at condenser tube diameter 6 mm. In thermal investigation, the heat flux is more for copper material at condenser tube diameter 6 mm. Copper offers maximum heat flux. Also, refrigerant R22 scores maximum for the heat transfer criteria, but cannot be recommended due to toxicity

The effect on heat flux DSC measurements of physico-chemical properties of the sample

1989 ◽  
Vol 156 (2) ◽  
pp. 259-266 ◽  
Author(s):  
A. Marini ◽  
V. Berbenni ◽  
V. Massarotti ◽  
C. Margheritis
Keyword(s):  
Heat Flux ◽  
Chemical Properties ◽  
Dsc Measurements ◽  
Physico Chemical ◽  
Heat Flux Dsc
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