Relation between local temperature gradients and the direction of heat flow in quantum driven systems

2012 ◽  
Vol 407 (16) ◽  
pp. 3172-3174 ◽  
Author(s):  
Alvaro Caso ◽  
Liliana Arrachea ◽  
Gustavo S. Lozano
Keyword(s):  
Heat Flow ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Driven Systems

Pulsated flow regime in fractures: a possible explanation of local temperature gradients in hydrothermal systems

Geothermics ◽  
1990 ◽  
Vol 19 (4) ◽  
pp. 329-339 ◽  
Author(s):  
Pierre-Olivier Grimaud ◽  
Gérard Touchard ◽  
Daniel Beaufort ◽  
Alain Meunier
Keyword(s):  
Flow Regime ◽  
Hydrothermal Systems ◽  
Temperature Gradients ◽  
Local Temperature

Geothermal gradients and terrestrial heat flow along a south‐north profile in the Sverdrup Basin, Canadian Arctic Archipelago

Geophysics ◽  
1990 ◽  
Vol 55 (8) ◽  
pp. 1105-1107 ◽  
Author(s):  
F. W. Jones ◽  
J. A. Majorowicz ◽  
A. F. Embry ◽  
A. M. Jessop
Keyword(s):  
Fluid Flow ◽  
Heat Flow ◽  
Lower Cretaceous ◽  
Canadian Arctic ◽  
Thermal Anomaly ◽  
Temperature Gradients ◽  
Petroleum Exploration ◽  
Canadian Arctic Archipelago ◽  
Sverdrup Basin ◽  
Sill Intrusion

Data from eleven petroleum exploration wells along a south‐north profile in the Sverdrup Basin of the Canadian Arctic Islands indicate large variations in temperature gradients(18 ± 2 to 39 ± 2 mK/m) and heat‐flow values [Formula: see text]. High values occur near the axis of the basin and values decrease systematically toward the southern and northern flanks of the basin. The basin axis in this area is the zone of maximum crustal attenuation and Lower Cretaceous dike and sill intrusion, but any thermal anomaly associated with these events will have dissipated by now. The present heat‐flow pattern is likely the result of thermal refraction or fluid flow in the basin.

Interface Temperatures and Temperature Gradients in Silicon During Pulsed Laser Irradiation

1988 ◽  
Vol 100 ◽  
Author(s):  
B. C. Larson ◽  
J. Z. Tischler ◽  
D. M. Mills
Keyword(s):  
Heat Flow ◽  
Laser Irradiation ◽  
Thermal Strain ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Temperature Gradients ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Gradients ◽  
Pulsed Laser Irradiation

ABSTRACTNanosecond-resolution x-ray diffraction has been used to measure the interface and lattice temperatures of silicon during rapid, pulsed-laser induced melting and regrowth in silicon. Measurements have been carried out on <100> and <111> oriented silicon using the (100) and (111) reflections to measure the thermal strain during 30 ns, 1.1 J/cm2 KrF laser pulses. The results indicate overheating to be low (< 2 K/m/s) for both orientations with undercooling rates of 5.6 K/m/s and 11.4 K/m/s for the <100> and <111> orientations, respectively. Observations of higher than expected temperature gradients below the liquidsolid interface have been discussed in terms of restricted heat flow under high gradients.

scholarly journals Tópicos do Método da Razão de Bowen

UNICIÊNCIAS ◽  
2021 ◽  
Vol 25 (1) ◽  
pp. 64-68
Author(s):  
Osvaldo Alves Pereira ◽  
Victor Hugo de Moraes Danelichen ◽  
Noel Flávio Costa Ferreira ◽  
Eduardo Nogueira dos Santos ◽  
Jonathan Willian Zangeski Novais ◽  
...  
Keyword(s):  
Heat Flow ◽  
Latent Heat ◽  
Physical State ◽  
Natural Process ◽  
Temperature Gradients ◽  
Water Volume ◽  
Flowing Water ◽  
Evaporation Process ◽  
Heat Flows ◽  
Mathematical Foundations

Este trabalho teve como objetivo mostrar a dedução física e matemática do método de Bowen na conversão de fluxo de calor latente em unidade de volume de água. A evapotranspiração é o processo natural de fluxo de água para atmosfera. Dentre as técnicas meteorológicas existentes, o método de Bowen consiste na razão entre os fluxos de calor latente (energia destinada para mudança de estado físico da água) e sensível (energia destinada para mudança de temperatura) emitidos por uma superfície durante o processo de evaporação e transpiração das plantas, em função dos gradientes da pressão de vapor e da temperatura observados sobre a superfície. Além disso, o método está fundamentado no princípio de conservação de energia, com fundamentos matemáticos relativamente simples e com modesto aparato instrumental.   Palavras-chaves: Fluxo de calor; micrometeorologia; perda de água; atmosfera.   Abstract This work aimed to show the physical and mathematical deduction of the Bowen method in the conversion of latent heat flow into a unit of water volume. Evapotranspiration is the natural process of flowing water into the atmosphere. Among the existing meteorological techniques, the Bowen method consists of the ratio between the latent heat flows (energy destined to change the physical state of the water) and sensitive (energy destined to change the temperature) emitted by a surface during the evaporation process and plant transpiration, depending on the vapor pressure and temperature gradients observed on the surface. In addition, the method is based on the principle of energy conservation, with relatively simple mathematical foundations and with modest instrumental apparatus.   Keywords: Heat flow; micrometeorology; loss of water; atmosphere.

scholarly journals Effects of microtopography on texture, temperature and heat flow in Arctic and sub-Arctic snow

1994 ◽  
Vol 19 ◽  
pp. 63-68 ◽  
Author(s):  
Matthew Sturm ◽  
Jonathan Holmgren
Keyword(s):  
Heat Flux ◽  
Heat Flow ◽  
Snow Depth ◽  
In Situ Measurements ◽  
Temperature Gradients ◽  
Substantial Fraction ◽  
Model Based ◽  
Vertical Heat ◽  
Lateral Temperature

Arctic and sub-Arctic snow is deposited on ground that can have significant microrelief due to tundra hummocks and tussocks. The microrelief, a substantial fraction of the total snow depth, causes basal layers of snow (usually depth hoar) to be discontinuous. In-situ measurements made at four locations in Alaska indicate lateral temperature gradients up to 60°C m−1exist at the snow/ground interface due to the microtopography. For all sites, the winter average range of temperature along a 1.5 m transect at the interface varied from 4°C to greater than 7°C. Heat-flux transducers placed at the tops and bases of tussocks indicated that vertical heat flow was consistently 1.4 to 2.1 times higher at the top than the base. Results of a conductive model based on tussock height are consistent with these measurements.

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