Turbulent transport processes of momentum and sensible heat in the surface layer over a paddy field

1987 ◽  
Vol 40 (3) ◽  
pp. 283-293 ◽  
Author(s):  
T. Maitani ◽  
E. Ohtaki
Keyword(s):  
Surface Layer ◽  
Paddy Field ◽  
Turbulent Transport ◽  
Transport Processes ◽  
Sensible Heat

New possibilities for the mathematical modelling of turbulent transport processes in plasma

2012 ◽  
Author(s):  
Ν. N. Skvortsova ◽  
G. M. Batanov ◽  
A. E. Petrov ◽  
A. A. Pshenichnikov ◽  
K. A. Sarksyan ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Turbulent Transport ◽  
Transport Processes

scholarly journals Evaluating the performance of two surface layer schemes for the momentum and heat exchange processes during severe haze pollution in Jing-Jin-Ji in eastern China

2018 ◽  
Vol 18 (23) ◽  
pp. 17421-17435 ◽  
Author(s):  
Yue Peng ◽  
Hong Wang ◽  
Yubin Li ◽  
Changwei Liu ◽  
Tianliang Zhao ◽  
...  
Keyword(s):  
Surface Layer ◽  
Roughness Length ◽  
Turbulent Flux ◽  
Eastern China ◽  
Heat Fluxes ◽  
Sensible Heat ◽  
Chemical Models ◽  
Atmospheric Stratification ◽  
Haze Pollution ◽  
Thermal Roughness Length

Abstract. The turbulent flux parameterization schemes in the surface layer are crucial for air pollution modeling. There have been some deficiencies in the prediction of air pollutants by atmosphere chemical models, which is closely related to the uncertainties of the momentum and sensible heat fluxes calculated in the surface layer. The differences between two surface layer schemes (Li and MM5 schemes) were discussed, and the performances of two schemes were mainly evaluated based on the observed momentum and sensible heat fluxes during a heavy haze episode in Jing-Jin-Ji in eastern China. The results showed that the aerodynamic roughness length z0m and the thermal roughness length z0h played major roles in the flux calculation. Compared with the Li scheme, ignoring the difference between z0m and z0h in the MM5 scheme induced a great error in the calculation of the sensible heat flux (e.g., the error was 54 % at Gucheng station). Besides the roughness length, the algorithm for the surface turbulent flux as well as the roughness sublayer also resulted in certain errors in the MM5 scheme. In addition, magnitudes of z0m and z0h have significant influence on the two schemes. The large z0m and z0m∕z0h in megacities with a rough surface (e.g., Beijing) resulted in much larger differences of momentum and sensible heat fluxes between Li and MM5, compared with the small z0m and z0m∕z0h in suburban areas with a smooth surface (e.g., Gucheng). The Li scheme could better characterize the evolution of atmospheric stratification than the MM5 scheme in general, especially for the transition stage from unstable to stable atmospheric stratification, corresponding to the PM2.5 accumulation. The biases of momentum and sensible heat fluxes from Li were lower, about 38 % and 43 %, respectively, than those from MM5 during this stage. This study indicates the superiority of the Li scheme in describing regional atmospheric stratification and an improved possibility of severe haze prediction in Jing-Jin-Ji in eastern China by coupling it into atmosphere chemical models.

On the analysis of turbulent transport processes in nonreacting multijet burner flows

1992 ◽  
Vol 13 (2-3) ◽  
pp. 179-189 ◽  
Author(s):  
M. V. Heitor ◽  
A. L. N. Moreira
Keyword(s):  
Turbulent Transport ◽  
Transport Processes

scholarly journals The dynamics of the surface layer of lipid membranes doped by vanadium complex: computer modeling and EPR studies

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 395-398 ◽  
Author(s):  
Ryszard Olchawa ◽  
Dariusz Man ◽  
Barbara Pytel
Keyword(s):  
Surface Layer ◽  
Lipid Membranes ◽  
Liquid Crystalline ◽  
Membrane Surface ◽  
Egg Yolk ◽  
Transport Processes ◽  
Spectroscopic Parameter ◽  
Vanadium Complex ◽  
Spin Resonance ◽  
Complex Computer

Abstract Penetration of the liposome membranes doped with vanadium complex formed in the liquid-crystalline phase from egg yolk lecithin (EYL) by the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) spin probes has been investigated. The penetration process was followed by 360 hours at 24°C, using the electron spin resonance (EPR) method. The spectroscopic parameter of the partition (F) of this probe indicated that a maximum rigidity of the membrane was at 3% concentration of the vanadium complex. Computer simulations showed that the increase in the rigidity of the membrane corresponds to the closure of gaps in the surface layer of the membrane, and indicates the essential role of the membrane surface in transport processes.

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