Successive reactivation of older structures under variable heat flow conditions evidenced by K–Ar fault gouge dating in Sierra de Ambato, northern Argentine broken foreland

2015 ◽  
Vol 64 ◽  
pp. 152-165 ◽  
Author(s):  
Julieta C. Nóbile ◽  
Gilda Collo ◽  
Federico M. Dávila ◽  
Federico Martina ◽  
Klaus Wemmer
Keyword(s):  
Heat Flow ◽  
Fault Gouge ◽  
Flow Conditions ◽  
Variable Heat ◽  
Fault Gouge Dating ◽  
Variable Heat Flow

Cylindrical probe with a variable heat flow rate: A new method for the determination of formation thermal conductivity

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Lev Eppelbaum ◽  
Izzy Kutasov
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Flow Rate ◽  
Dry Density ◽  
Heat Flow Rate ◽  
Cylindrical Probe ◽  
Variable Heat ◽  
Variable Heat Flow

AbstractThe thermal conductivity of a geological formation is one of the important petrophysical parameters which are preferable to study in situ in geophysical well logs. A new technique for the determination of formation thermal conductivity has been developed. We assumed that formation dry density, porosity, and pore fluids saturations could be determined from core samples or cuttings. In this case the specific heat and density of a formation can be quantitatively estimated. It is also assumed that the instantaneous heat flow rate and time data are available for a cylindrical probe with a variable heat flow rate placed in a wellbore. A semi-theoretical equation describing the temperature of the probe’s wall is used to determine in situ the formation conductivity as a function of the temperature increase. The formation thermal diffusivity is also calculated. A field example is presented.

Microstructural Evolution during the Directional Transient Solidification of a Hypomonotectic Al-0.9wt%Pb Alloy

2012 ◽  
Vol 730-732 ◽  
pp. 829-834
Author(s):  
Adrina P. Silva ◽  
Pedro R. Goulart ◽  
José Eduardo Spinelli ◽  
Amauri Garcia
Keyword(s):  
Growth Rate ◽  
Heat Flow ◽  
Thermal Parameters ◽  
Cooling Curves ◽  
Flow Conditions ◽  
Directionally Solidified ◽  
Microstructural Transition ◽  
Transient Heat Flow ◽  
Growth Laws ◽  
Casting Length

In the present study a hypomonotectic Al-0.9wt%Pb alloy was directionally solidified under transient heat flow conditions and the microstructure evolution was analyzed. The solidification thermal parameters such as the growth rate, the cooling rate and the temperature gradient were experimentally determined by cooling curves recorded by thermocouples positioned along the casting length. The monotectic structure was characterized by metallography and a microstructural transition was observed. From the casting cooled surface up to a certain position in the casting the microstructure was characterized by well-distributed Pb-rich droplets in the aluminum-rich matrix, followed by a mixture of fibers and strings of pearls from this point to the top of the casting. The interphase spacing (λ) and the diameter of Pb-rich particles were also measured along the casting length and experimental growth laws relating these microstructural features to the experimental thermal parameters are proposed.

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

scholarly journals The calculation of variable heat flow in solids

1946 ◽  
Vol 240 (813) ◽  
pp. 1-57 ◽  
Keyword(s):  
Thermal Properties ◽  
Heat Flow ◽  
Analytical Solutions ◽  
Numerical Evaluation ◽  
Formal Solution ◽  
Industrial Processes ◽  
Laboratory Work ◽  
Engineering Practice ◽  
Direct Experiment ◽  
Variable Heat Flow

In many contexts, in laboratory work, in industrial processes and in engineering practice, situations arise in which it is required to determine the flow of heat in bodies under nonsteady conditions. In some cases this can be done by direct experiment, and a few cases are sufficiently simple for formal analytical solutions of the appropriate equations to be obtained and evaluated. But direct experiment is often difficult or impossible, especially under practical conditions of manufacture or operation; and often the conditions of the problem, such as inhomogeneity or the shape of the material, or variation of its thermal properties with temperature, either make the formal solution so complicated that its numerical evaluation is impracticable, or put a formal solution out of the question altogether.

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