Thermal gradient effect on helium and self-interstitial transport in tungsten

2021 ◽  
Vol 130 (21) ◽  
pp. 215904
Author(s):  
Enrique Martínez ◽  
Nithin Mathew ◽  
Danny Perez ◽  
Sophie Blondel ◽  
Dwaipayan Dasgupta ◽  
...  
Keyword(s):  
Thermal Gradient ◽  
Gradient Effect ◽  
Interstitial Transport

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 Enhanced c-axis KTN beam deflector by compensating compositional gradient effect with a thermal gradient

OSA Continuum ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 665
Author(s):  
Yun Goo Lee ◽  
Chang-Jiang Chen ◽  
Annan Shang ◽  
Ruijia Liu ◽  
Ju-Hung Chao ◽  
...  
Keyword(s):  
Thermal Gradient ◽  
Compositional Gradient ◽  
Gradient Effect
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