With hydrogen-like impurity（HLI） located in the center of Cs I quantum pseudodot（QPD） and by using the variational method of Pekar type（VMPT）, we investigate the first-excited state energy（FESE）, excitation en...With hydrogen-like impurity（HLI） located in the center of Cs I quantum pseudodot（QPD） and by using the variational method of Pekar type（VMPT）, we investigate the first-excited state energy（FESE）, excitation energy and transition frequency of the strongly-coupled bound polaron in the present paper. Temperature effects on bound polaron properties are calculated by employing the quantum statistical theory（QST）. According to the present work＇s numerical results, the FESE, excitation energy and transition frequency decay（amplify） with raising temperature in the regime of lower（higher）temperature. They are decreasing functions of Coulomb impurity potential strength.展开更多
The fluid temperature statistics along particle trajectories is crucial to under-stand the mechanisms of turbulent non-isothermal or reactive fluid-particle flow,especially for the Lagrangian model of non-isothermal p...The fluid temperature statistics along particle trajectories is crucial to under-stand the mechanisms of turbulent non-isothermal or reactive fluid-particle flow,especially for the Lagrangian model of non-isothermal particle-laden turbulent flow.In the present study,direct numerical simulations were utilized to generate temperature field statistics in particle-laden incompressible stationary homogeneous isotropic turbulent flows,which is focused on the effect of particle response time on the Lagrangian statistics of the particle and the fluid temperature seen by particles.It shows that,for the particles withτp/τk<1,the ratio of the fluid intensity seen by particle to fluid temperature intensities deceased asτp/τk increased;while for larger particles(τp/τk>1),the trend is inversed.For small parti-cles(τp/τk<5),the Lagrangian autocorrelation coefficient of the particle temperature R_(p)^(T)decreases as the particle inertia(τp/τk)increases.The trend is reversed for larger particles.The autocorrelation of fluid temperature along the particle path,R_(pf)^(T),decreased as the particle inertia increased.And as the particle inertia increased,the autocorrelation coeffi-cient of the fluid temperature seen by particle decreased more rapidly than that of the particle temperature.The mean temperature gradient contributes to the correlation be-tween the particles velocity component and temperature fluctuations in the direction of the gradient.For the particles withτp/τk<1,the magnitude of the correlation coefficient in-creases as the particle inertia increases,while this value is independent of the particle time constant for larger particles.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11464033)
文摘With hydrogen-like impurity（HLI） located in the center of Cs I quantum pseudodot（QPD） and by using the variational method of Pekar type（VMPT）, we investigate the first-excited state energy（FESE）, excitation energy and transition frequency of the strongly-coupled bound polaron in the present paper. Temperature effects on bound polaron properties are calculated by employing the quantum statistical theory（QST）. According to the present work＇s numerical results, the FESE, excitation energy and transition frequency decay（amplify） with raising temperature in the regime of lower（higher）temperature. They are decreasing functions of Coulomb impurity potential strength.
基金This work was partially supported by the State Key Project of Fundamental Research,Ministry of Science and Technology,China(Grant Nos.G1999022207,2002CB211600)the National Natural Science Foundation of China(Grant Nos.50276021,50576027)Program for New Century Excellent Talents in University,Ministry of Education,China(Grant No.NCET-04-0708).
文摘The fluid temperature statistics along particle trajectories is crucial to under-stand the mechanisms of turbulent non-isothermal or reactive fluid-particle flow,especially for the Lagrangian model of non-isothermal particle-laden turbulent flow.In the present study,direct numerical simulations were utilized to generate temperature field statistics in particle-laden incompressible stationary homogeneous isotropic turbulent flows,which is focused on the effect of particle response time on the Lagrangian statistics of the particle and the fluid temperature seen by particles.It shows that,for the particles withτp/τk<1,the ratio of the fluid intensity seen by particle to fluid temperature intensities deceased asτp/τk increased;while for larger particles(τp/τk>1),the trend is inversed.For small parti-cles(τp/τk<5),the Lagrangian autocorrelation coefficient of the particle temperature R_(p)^(T)decreases as the particle inertia(τp/τk)increases.The trend is reversed for larger particles.The autocorrelation of fluid temperature along the particle path,R_(pf)^(T),decreased as the particle inertia increased.And as the particle inertia increased,the autocorrelation coeffi-cient of the fluid temperature seen by particle decreased more rapidly than that of the particle temperature.The mean temperature gradient contributes to the correlation be-tween the particles velocity component and temperature fluctuations in the direction of the gradient.For the particles withτp/τk<1,the magnitude of the correlation coefficient in-creases as the particle inertia increases,while this value is independent of the particle time constant for larger particles.
