Improved non-local electron thermal transport model for two-dimensional radiation hydrodynamics simulations

2015 ◽  
Vol 22 (8) ◽  
pp. 082308 ◽  
Author(s):  
Duc Cao ◽  
Gregory Moses ◽  
Jacques Delettrez
Keyword(s):  
Thermal Transport ◽  
Transport Model ◽  
Radiation Hydrodynamics ◽  
Two Dimensional ◽  
Local Electron ◽  
Non Local ◽  
Electron Thermal Transport

Effects of non-local electron thermal transport on ablative Rayleigh-Taylor instability

1999 ◽  
Vol 44 (1-4) ◽  
pp. 205-208
Author(s):  
M Honda ◽  
K Mima ◽  
K Shigemori ◽  
M Nakai ◽  
H Azechi ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Taylor Instability ◽  
Local Electron ◽  
Non Local ◽  
Rayleigh Taylor Instability ◽  
Electron Thermal Transport

scholarly journals Interaction of equivalence ratio fluctuations and flow fluctuations in acoustically forced swirl flames

2021 ◽  
pp. 175682772110155
Author(s):  
Vincent Kather ◽  
Finn Lückoff ◽  
Christian O. Paschereit ◽  
Kilian Oberleithner
Keyword(s):  
Equivalence Ratio ◽  
Transfer Functions ◽  
Transport Model ◽  
Mode Conversion ◽  
Fuel Injector ◽  
One Dimensional ◽  
Flow Fluctuations ◽  
Non Linear ◽  
Non Local ◽  
Acoustic Forcing

The generation and turbulent transport of temporal equivalence ratio fluctuations in a swirl combustor are experimentally investigated and compared to a one-dimensional transport model. These fluctuations are generated by acoustic perturbations at the fuel injector and play a crucial role in the feedback loop leading to thermoacoustic instabilities. The focus of this investigation lies on the interplay between fuel fluctuations and coherent vortical structures that are both affected by the acoustic forcing. To this end, optical diagnostics are applied inside the mixing duct and in the combustion chamber, housing a turbulent swirl flame. The flame was acoustically perturbed to obtain phase-averaged spatially resolved flow and equivalence ratio fluctuations, which allow the determination of flux-based local and global mixing transfer functions. Measurements show that the mode-conversion model that predicts the generation of equivalence ratio fluctuations at the injector holds for linear acoustic forcing amplitudes, but it fails for non-linear amplitudes. The global (radially integrated) transport of fuel fluctuations from the injector to the flame is reasonably well approximated by a one-dimensional transport model with an effective diffusivity that accounts for turbulent diffusion and dispersion. This approach however, fails to recover critical details of the mixing transfer function, which is caused by non-local interaction of flow and fuel fluctuations. This effect becomes even more pronounced for non-linear forcing amplitudes where strong coherent fluctuations induce a non-trivial frequency dependence of the mixing process. The mechanisms resolved in this study suggest that non-local interference of fuel fluctuations and coherent flow fluctuations is significant for the transport of global equivalence ratio fluctuations at linear acoustic amplitudes and crucial for non-linear amplitudes. To improve future predictions and facilitate a satisfactory modelling, a non-local, two-dimensional approach is necessary.

Thermal Transport Property of Novel Two-dimensional Nitride Phosphorus: an ab initio Study

2021 ◽  
pp. 149463
Author(s):  
Bing Lv Calculation ◽  
Xiaona Hu ◽  
Ning Wang ◽  
Jia Song ◽  
Xuefei Liu ◽  
...  
Keyword(s):  
Ab Initio ◽  
Transport Property ◽  
Thermal Transport ◽  
Two Dimensional ◽  
Ab Initio Study ◽  
Thermal Transport Property

Effects of spin-phonon coupling on two-dimensional ferromagnetic semiconductors: a case study of iron and ruthenium trihalides

Nanoscale ◽  
2021 ◽  
Author(s):  
Yinqiao Liu ◽  
Qinxi Liu ◽  
Ying Liu ◽  
Xue Jiang ◽  
Xiaoliang Zhang ◽  
...  
Keyword(s):  
Transport Properties ◽  
Data Security ◽  
Thermal Transport ◽  
Magnetic Semiconductors ◽  
Ferromagnetic Semiconductors ◽  
Two Dimensional ◽  
Phonon Coupling ◽  
Thermal Transport Properties

The contributions of spin-phonon coupling (SPC) to spin and thermal transport properties are important in the emerging two-dimensional (2D) magnetic semiconductors and are relevant for the data security and working...

scholarly journals Validation of the thermal transport model used for ITER startup scenario predictions with DIII-D experimental data

2010 ◽  
Vol 51 (1) ◽  
pp. 013001 ◽  
Author(s):  
T.A. Casper ◽  
W.H. Meyer ◽  
G.L. Jackson ◽  
T.C. Luce ◽  
A.W. Hyatt ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermal Transport ◽  
Transport Model
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