Thermocapillary instabilities in a liquid layer subjected to an oblique temperature gradient: Effect of a prescribed normal temperature gradient at the substrate

2020 ◽  
Vol 32 (11) ◽  
pp. 112109
Author(s):  
Ramkarn Patne ◽  
Yehuda Agnon ◽  
Alexander Oron
Keyword(s):  
Temperature Gradient ◽  
Liquid Layer ◽  
Gradient Effect

A Theoretical Study of the Temperature Gradient Effect on the Soret Coefficient in n-Pentane/n-Decane Mixtures Using Non-Equilibrium Molecular Dynamics

2020 ◽  
Vol 45 (4) ◽  
pp. 319-332
Author(s):  
Xiaoyu Chen ◽  
Ruquan Liang ◽  
Yong Wang ◽  
Ziqi Xia ◽  
Lichun Wu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Temperature Gradient ◽  
Thermal Gradient ◽  
Linear Response ◽  
Theoretical Study ◽  
Soret Coefficient ◽  
Thermal Gradients ◽  
Gradient Effect ◽  
Non Equilibrium Molecular Dynamics ◽  
Non Equilibrium

AbstractThe effect of the temperature gradient on the Soret coefficient in n-pentane/n-decane (n-C5/n-C10) mixtures was investigated using non-equilibrium molecular dynamics (NEMD) with the heat exchange (eHEX) algorithm. n-Pentane/n-decane mixtures with three different compositions (0.25, 0.5, and 0.75 mole fractions, respectively) and the TraPPE-UA force field were used in computing the Soret coefficient ({S_{T}}) at 300 K and 1 atm. Added/removed heat quantities (ΔQ) of 0.002, 0.004, 0.006, 0.008, and 0.01 kcal/mol were employed in eHEX processes in order to study the effect of different thermal gradients on the Soret coefficient. Moreover, a phenomenological description was applied to discuss the mechanism of this effect. Present results show that the Soret coefficient values firstly fluctuate violently and then become increasingly stable with increasing ΔQ (especially in the mixture with a mole fraction of 0.75), which means that ΔQ has a smaller effect on the Soret coefficient when the temperature gradient is higher than a certain thermal gradient. Thus, a high temperature gradient is recommended for calculating the Soret coefficient under the conditions that a linear response and constant phase are ensured in the system. In addition, the simulated Soret coefficient obtained at the highest ΔQ within three different compositions is in great agreement with experimental data.

scholarly journals Experimental study and numerical simulation of temperature gradient effect for steel-concrete composite bridge deck

2021 ◽  
pp. 002029402110071
Author(s):  
Da Wang ◽  
Benkun Tan ◽  
Xie Wang ◽  
Zhenhao Zhang
Keyword(s):  
Experimental Study ◽  
Thermal Stress ◽  
Temperature Distribution ◽  
Temperature Gradient ◽  
Bridge Deck ◽  
Vertical Temperature ◽  
Extreme Stress ◽  
Gradient Effect ◽  
Composite Bridge ◽  
Composite Bridge Deck

The temperature distribution of the bridge and its thermal effect has always been an important issue for researchers. To investigate the temperature distribution and thermal stress in the steel-concrete composite bridge deck, a 1:4 ratio temperature gradient effect experimental study was carried out in this paper. First, a set of experimental equipment for laboratory temperature gradient loading was designed based on the principle of temperature gradient caused by solar radiation, the temperature gradient obtained from the measurements were compared with the specifications and verified by the FE method. Next, the loading of the steel-concrete composite deck at different temperatures was performed. The thermal stress response and change trend of the simply supported and continuously constrained boundary conditions under different temperature loads were analyzed. The experimental results show that the vertical temperature of steel-concrete composite bridge deck is nonlinear, which is consistent with the temperature gradient trend of specifications. The vertical temperature gradient has a great influence on the steel-concrete composite bridge deck under different constraints, and the extreme stress of concrete slab and steel beam is almost linear with the temperature gradient. Finally, some suggestions for steel-concrete composite deck design were provided based on the research results.

Formation of highly preferred orientation of β-Sn grains in solidified Cu/SnAgCu/Cu micro interconnects under temperature gradient effect

2017 ◽  
Vol 110 (9) ◽  
pp. 093504 ◽  
Author(s):  
N. Zhao ◽  
Y. Zhong ◽  
W. Dong ◽  
M. L. Huang ◽  
H. T. Ma ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Preferred Orientation ◽  
Gradient Effect

TRAVEL INSTABILITIES IN LATERAL HEATING

2001 ◽  
Vol 11 (11) ◽  
pp. 2881-2886 ◽  
Author(s):  
M. A. PELACHO ◽  
A. GARCIMARTÍN ◽  
J. BURGUETE
Keyword(s):  
Free Surface ◽  
Temperature Gradient ◽  
Liquid Layer ◽  
Temperature Difference ◽  
Convective Motion ◽  
Lateral Heating ◽  
Rectangular Container ◽  
The Waves

We study the convective motion forced by lateral heating on a liquid layer. The movement is caused by two forces: buoyancy and thermocapillarity on the free surface, which is open to the air. As soon as a temperature gradient is imposed along the liquid layer, the fluid begins to move. When a certain threshold of the temperature difference is attained, this flow destabilizes and oscillations appear. We have performed an experiment to characterize the thermocapillary waves in a rectangular container whose dimensions can be continuously changed. This way, we are able to investigate how boundaries affect the threshold for the instability, as well as their consequences on other features of the waves.

Sign in / Sign up

Export Citation Format

Share Document