Anisotropic effect of natural convection on the temperature field in an enclosure in the presence of stable temperature stratification

2015 ◽  
Vol 50 (5) ◽  
pp. 681-690
Author(s):  
A. V. Anan’ev ◽  
V. V. Mironov ◽  
D. A. Moiseeva ◽  
S. G. Cherkasov
Keyword(s):  
Temperature Field ◽  
Natural Convection ◽  
Temperature Stratification ◽  
Anisotropic Effect ◽  
Stable Temperature

EXPERIMENTAL STUDY OF NATURAL CONVECTION IN A CAVITY: PRECISE VISUALIZATION METHOD OF TEMPERATURE FIELD

2018 ◽  
Author(s):  
Menghua Duan ◽  
Lin Chen ◽  
Yongchang Feng ◽  
Junnosuke Okajima ◽  
Atsuki Komiya
Keyword(s):  
Experimental Study ◽  
Temperature Field ◽  
Natural Convection ◽  
Visualization Method

Hot-Film Measurement of Natural Convection in Liquid Gallium With and Without Magnetic Fields

Volume 1 ◽  
2004 ◽  
Author(s):  
B. Xu ◽  
B. Q. Li ◽  
D. E. Stock
Keyword(s):  
Magnetic Field ◽  
Temperature Field ◽  
Natural Convection ◽  
External Magnetic Field ◽  
Narrow Range ◽  
Temperature Fields ◽  
Liquid Gallium ◽  
Numerical Predictions ◽  
Velocity And Temperature Fields ◽  
Hot Film

The velocity and temperature fields induced by natural convection in liquid gallium were measured. Measurements were taken with and without an external magnetic field applied to the liquid gallium. The velocity field was measured with a hot-film anemometer and the temperature field with a thermocouple. The hot film was calibrated over a narrow range of temperatures in a rotating turntable filled with liquid gallium. The external magnetic field damped both the velocity and temperature fields compared to similar conditions when no external magnetic field was present. The experimental results compared reasonably well with previous numerical predictions.

Heat Transfer Due to Natural Convection in a Periodically Heated Slot

2012 ◽  
Vol 135 (2) ◽  
Author(s):  
M. Z. Hossain ◽  
J. M. Floryan
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Temperature Field ◽  
Natural Convection ◽  
Average Nusselt Number ◽  
Horizontal Direction ◽  
Wave Number ◽  
Lower Wall ◽  
Maximum Heat ◽  
Maximum Heat Transfer

Heat transfer resulting from the natural convection in a fluid layer contained in an infinite horizontal slot bounded by solid walls and subject to a spatially periodic heating at the lower wall has been investigated. The heating produces sinusoidal temperature variations along one horizontal direction characterized by the wave number α with the amplitude expressed in terms of a suitably defined Rayleigh number Rap. The maximum heat transfer takes place for the heating with the wave numbers α = 0(1) as this leads to the most intense convection. The intensity of convection decreases proportionally to α when α→0, resulting in the temperature field being dominated by periodic conduction with the average Nusselt number decreasing proportionally to α2. When α→∞, the convection is confined to a thin layer adjacent to the lower wall with its intensity decreasing proportionally to α−3. The temperature field above the convection layer looses dependence on the horizontal direction. The bulk of the fluid sees the thin convective layer as a “hot wall.” The heat transfer between the walls becomes dominated by conduction driven by a uniform vertical temperature gradient which decreases proportionally to the intensity of convection resulting in the average Nusselt number decreasing as α−3. It is shown that processes described above occur for Prandtl numbers 0.001 < Pr < 10 considered in this study.

Numerical Simulation of Temperature Field of Linear Friction Welding of Titanium Alloy

2013 ◽  
Vol 328 ◽  
pp. 981-984
Author(s):  
Z.M. Liu ◽  
J. Wang ◽  
J.L. Pan
Keyword(s):  
Titanium Alloy ◽  
Temperature Field ◽  
Material Properties ◽  
Friction Welding ◽  
Contact Boundary ◽  
Linear Friction Welding ◽  
Stable Temperature ◽  
Linear Friction ◽  
Key Techniques ◽  
Finite Elements Model

In this paper, A 3D finite-elements model of titanium alloy TC4 of linear friction welding is developed based on the solution of several key techniques, such as contact boundary condition treating, material properties definition, meshing technology, etc. The temperature field and the temperature gradient of workpiece are showed in results. The temperature at the interface was quickly increased to near 1000°C at 1s, and then reached a quasi-steady and the stable temperature of interface maintained about 1100°C until welding finished.

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