Determination of latent heat and changes in solid fraction during solidification of Al-Si alloys by the CA-CCA method

1998 ◽  
Vol 10 (6) ◽  
pp. 307-319 ◽  
Author(s):  
J. F. Hu ◽  
E. N. Pan
Keyword(s):  
Latent Heat ◽  
Solid Fraction

Determination of the latent heat of fusion and solid fraction evolution of metals and alloys by an improved cooling curve analysis method

2019 ◽  
Vol 140 (4) ◽  
pp. 1825-1836 ◽  
Author(s):  
Carlos González-Rivera ◽  
Anthony Harrup ◽  
Carla Aguilar ◽  
Adrián M. Amaro-Villeda ◽  
Marco A. Ramírez-Argáez
Keyword(s):  
Latent Heat ◽  
Solid Fraction ◽  
Metals And Alloys ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Heat Of Fusion ◽  
Analysis Method ◽  
Latent Heat Of Fusion ◽  
Cooling Curve Analysis

Assessment of Latent Heat and Solid Fraction of Al-22Si Alloy Using Newtonian and Fourier Analysis Techniques

2015 ◽  
Vol 830-831 ◽  
pp. 321-324 ◽  
Author(s):  
Vijeesh Vijayan ◽  
K.N. Prabhu
Keyword(s):  
Fourier Analysis ◽  
Latent Heat ◽  
Solid Fraction ◽  
Solidification Process ◽  
Cooling Curve ◽  
Base Line ◽  
Analysis Techniques ◽  
Cooling Curve Analysis ◽  
Temperature Time

Computer aided cooling curve analysis (CACCA) is an online prediction tool for the determination of solidification characteristics of metals or alloys. The results of CACCA can be used to accurately determine latent heat and solid fraction needed for modeling of the solidification process. Newtonian and Fourier analysis techniques adopt a data base line fitting technique to the first derivative curve for calculation of the solid fraction and latent heat of solidification. This paper describes the theoretical and experimental procedures involved Newtonian and Fourier analysis techniques with reference to an Al-22% Si alloy. The correlations between the solid fraction and temperature/time for the alloy were determined.

scholarly journals The determination of the heat of dissociation of fluorine and of the latent heat of vaporisation of lithium

1932 ◽  
Vol 136 (829) ◽  
pp. 76-82 ◽  
Keyword(s):  
High Temperature ◽  
Absorption Spectra ◽  
Latent Heat ◽  
Chemical Reactivity ◽  
Direct Method ◽  
Thermal Methods ◽  
Heat Of Dissociation

The heats of dissociation of chlorine, bromine, and iodine have been determined by thermal methods and estimated to be 58·9, 45·2 and 35·2 kilo-cals. respectively. But no data are yet known concerning the heat of dissociation of fluorine. It is very difficult to subject fluorine to the same treatment as Cl 2 , Br 2 and I 2 ( i. e ., heating to a high temperature in a sealed quartz bulb) owing to its extreme chemical reactivity, and hence no direct method of determining the heat of dissociation of fluorine has yet been devised. In the present paper I have determined it indirectly by interpretation of the absorption spectra of alkali fluorides (for the present only NaF and KF). A short theory of the experiment is given below.

scholarly journals Determination of latent heat at the finite temperature phase transition of SU(3) gauge theory

2017 ◽  
Author(s):  
Shinji Ejiri ◽  
Ryo Iwami ◽  
Mizuki Shirogane ◽  
Naoki Wakabayashi ◽  
Kazuyuki Kanaya ◽  
...  
Keyword(s):  
Phase Transition ◽  
Gauge Theory ◽  
Latent Heat ◽  
Finite Temperature ◽  
Temperature Phase ◽  
Temperature Phase Transition

Determination of heat transfer coefficients in direct contact latent heat storage systems

2018 ◽  
Vol 145 ◽  
pp. 71-79 ◽  
Author(s):  
Sven Kunkel ◽  
Tobias Teumer ◽  
Patrick Dörnhofer ◽  
Kerstin Schlachter ◽  
Yohana Weldeslasie ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Direct Contact ◽  
Heat Storage ◽  
Storage Systems ◽  
Transfer Coefficients ◽  
Latent Heat Storage ◽  
Heat Transfer Coefficients

scholarly journals Comparison of Thermal Analysis and Differential Thermal Analysis for Evaluating Solid Fraction Evolution during Solidification of Al-Si Alloys

2010 ◽  
Vol 649 ◽  
pp. 493-498 ◽  
Author(s):  
Ana Isabel Fernández-Calvo ◽  
Andrea Niklas ◽  
Jacques Lacaze
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Heat Release ◽  
Latent Heat ◽  
Solid Fraction ◽  
Metallic Alloys ◽  
Transfer Model ◽  
Cooling Curves ◽  
Latent Heat Release ◽  
Controlled Cooling

Both thermal analysis (TA) and differential thermal analysis (DTA) have been used since long to evaluate latent heat release and solid fraction evolution during solidification of metallic alloys. TA makes use of cooling curves recorded under "natural" cooling while DTA consists in recording the temperature difference between the sample temperature and an inert reference during a controlled cooling, i.e. at imposed constant cooling rate. In both cases, the solid fraction evolution is deduced from a calculation of the latent heat release as estimated by means of a heat transfer model. This paper provides a comparison of such evaluations performed on one Al-Si alloy.

The absorption spectra of the gaseous monoxides of silicon, germanium and tin in the Schumann region

1954 ◽  
Vol 224 (1158) ◽  
pp. 374-388 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Ionization Potential ◽  
Absorption Spectra ◽  
Latent Heat ◽  
Satisfactory Agreement ◽  
Silicon Germanium ◽  
Silicon Monoxide ◽  
Dissociation Energies

The absorption spectra of the molecules SiO, GeO and SnO have been examined in the region 1250 to 2000Å. A number of new band systems have been found, and vibrational analyses have been carried out. The determination of the dissociation enérgies of these molecules is discussed: the values derived spectroscopically for SiO, GeO and SnO are 185∙ 0 ±6∙ 8 , 155∙ 8 ±5∙ 3 and 126∙ 0 ±4∙ 9 kcal (0° K) respectively. The values for GeO and SnO are in satisfactory agreement with the results of thermochemical work, but the result for SiO suggests that the value of the latent heat of sublimation of silicon is higher than has been suggested, and indicates L si ⋍100 kcal. The correlation between the states of carbon monoxide and of silicon monoxide is briefly considered, and a provisional value for the ionization potential of SiO, 10∙5 1 eV, is derived.

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