scholarly journals Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions

2018 ◽  
Vol 21 (3) ◽  
Author(s):  
Luis Antônio de Souza Baptista ◽  
Alexandre Furtado Ferreira ◽  
Késsia Gomes Paradela ◽  
Dimas Moraes da Silva ◽  
José Adilson de Castro
Keyword(s):  
Experimental Investigation ◽  
Heat Flow ◽  
Unsteady State ◽  
Flow Conditions ◽  
State Heat ◽  
Cu Alloy

Analysis of the Cutting Temperatures along the Macrostructure of a Directionally Solidified Al-7wt%Si Alloy

2015 ◽  
Vol 365 ◽  
pp. 116-121 ◽  
Author(s):  
Adrina P. Silva ◽  
I.R. Prado ◽  
J.S. Barros ◽  
C.A.P. Silva ◽  
A.L. Moreira ◽  
...  
Keyword(s):  
Heat Flow ◽  
Directional Solidification ◽  
Experimental Approach ◽  
Cutting Temperature ◽  
Columnar Structure ◽  
Thermal Parameters ◽  
Unsteady State ◽  
Flow Conditions ◽  
Directionally Solidified ◽  
Columnar To Equiaxed Transition

The aim of this research is to investigate the influence of solidification thermal parameters on the macrostructure of an Al-7wt%Si alloy during the horizontal directional solidification under unsteady-state heat flow conditions and its correlation with cutting temperatures. The solidification experiments were instrumented by thermocouples and an experimental approach was developed to quantitatively determine the solidification thermal parameters considered. The observation of the macrostructures has indicated that the columnar-to-equiaxed transition occurred in a sharp plane parallel to the chill wall and a higher average cutting temperature was obtained for the columnar structure.

Heat Transfer in the Vulcanization of Rubber

1929 ◽  
Vol 2 (1) ◽  
pp. 32-44
Author(s):  
T. K. Sherwood
Keyword(s):  
Heat Transfer ◽  
Heat Flow ◽  
Heating Process ◽  
Curing Time ◽  
Unsteady State ◽  
Cure Process ◽  
State Heat ◽  
Lag Effect ◽  
Water Cure

Abstract Temperature lag in the heating of rubber articles is found to cause marked non-uniformity of cure in the product. The theory of “unsteady state” heat flow is discussed, and a method described for analyzing data on temperatures in rubber being heated. From data on the temperatures at different times during the heating process and on the relation between the rate of cure and the temperature, it is shown how the resulting curing effect at different points in a solid rubber object may be calculated. A new water cure process for tires is described which is very effective in reducing the non-uniformity of cure caused by the temperature lag effect, and at the same time appreciably reduces the necessary curing time.

Unsteady state heat flow in epidermis and dermis of a human body

1988 ◽  
Vol 98 (1) ◽  
pp. 71-80 ◽  
Author(s):  
V P Saxena ◽  
K R Pardasani ◽  
R Agarwal
Keyword(s):  
Heat Flow ◽  
Human Body ◽  
Unsteady State ◽  
State Heat

HEAT TRANSFER PECULIARITIES IN HETEROGENEOUS SYSTEMS WITH HIGH UNSTEADY-STATE HEAT TRANSFER RATES

1970 ◽  
Author(s):  
N.V. Antonishin ◽  
S. S. Zabrodsky ◽  
L.E. Simchenko ◽  
V.V. Lushchikov
Keyword(s):  
Heat Transfer ◽  
Heterogeneous Systems ◽  
Unsteady State ◽  
Transfer Rates ◽  
State Heat

Unsteady state heat transfer in stationary packed beds

1961 ◽  
Vol 16 (1-2) ◽  
pp. 133-134 ◽  
Author(s):  
A. Klinkenberg ◽  
A. Harmens
Keyword(s):  
Heat Transfer ◽  
Packed Beds ◽  
Unsteady State ◽  
State Heat

scholarly journals The columnar to equiaxed transition in the directional solidification of aluminum based multicomponent alloys

2015 ◽  
Vol 68 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Otávio Lima Rocha ◽  
Laércio Gouvea Gomes ◽  
Daniel Joaquim Conceição Moutinho ◽  
Ivaldo Leão Ferreira ◽  
Amauri Garcia
Keyword(s):  
Cooling Rate ◽  
Tip Growth ◽  
Solute Concentration ◽  
Unidirectional Solidification ◽  
Unsteady State ◽  
Flow Conditions ◽  
Multicomponent Alloys ◽  
Vertical Solidification ◽  
Columnar To Equiaxed Transition ◽  
Si Content

In this work the columnar to equiaxed transition (CET) was experimentally investigated in the unidirectional solidification of three aluminum based multicomponent alloys (Al-nSi-3Cu), with "n" equal to 5.5, 7.5 and 9 wt.%. The main parameters analyzed include the tip temperature gradient (GL), tip growth rate (VL), tip cooling rate (TR) and Si content. A water-cooled solidification experimental setup was developed, and specimens were solidified under unsteady state heat flow conditions. It is shown that for the alloys examined, the solute concentration influences the position of the CET, which occurs for an average cooling rate of about 1.17 0C/s. A comparative analysis between the results of this work and those from literature proposed to analyze the CET during upward vertical solidification of Al-Si alloys is reported and the results show that the end of the columnar region is abbreviated as a result of seven times higher critical cooling rate than that verified for Al-Si alloys.

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