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| 1 | Effect of the benzene ring of the dispersant on the rheological characteristics of coal-water slurry:Experiments and theoretical calculations显示文摘In this study,low-rank coal-water slurry(LCWS)was prepared using polyoxyethylene dodecylphenol ether(PDPE)and polyoxyethylene lauryl ether(PLE),respectively.A combination of experiments and simulations was used to investigate the pulping properties and microscopic mechanism of the LCWS samples prepared using the two agents,so as to explore the influence of benzene ring on the performance of dispersant.The results of the LCWS preparation experiments revealed that the pulp-forming performance of PDPE exceeded that of PLE.When LCWS concentration is 62%,64%,and 66%,the apparent viscosity corresponding to PDPE is 247.80,504.17,and 653.10 mPa·s,and the apparent viscosity corresponding to PLE is 548.10,1470.61,and 1549.98 mPa·s,respectively.The C_(1000)(When the apparent viscosity is 1000 mPa·s,the corresponding concentration of LCWS is defined as C_(1000))values of PDPE and PLE are 67.60%and 62.95%,respectively.In addition to the van der Waals forces and hydrogen bonds between the PDPE and/or PLE molecules and coal,the benzene rings of PDPE presentπ-πstacking effect with the aromatic rings of coal.That could facilitate and strengthen the adsorption of PDPE on coal,which would be conducive to further improving the dispersion of coal particles.The two dispersants have no significant difference in effect on the pyrolysis of LCWS.The simulation results indicated that the times for PDPE and PLE molecules to reach flat adsorption state on coal are approximately 290 and 565 ps,respectively.The self-diffusion coefficient(D)of the PDPE and PLE on coal is 3.16 x 10^(-6)and6.57×10^(-6)m~2/s,respectively,and their interaction energies with coal are 785.71 and 648.60 kcal/mol,respectively.The results of the simulation calculations demonstrated that PDPE adsorbed on coal easier than PLE,and its binding is more stable than that of PLE owing to theπ-πstacking effect,which is conducive to uniform dispersion of coal in solution.The simulation results confirmed the experimental results. | Lin Li Chuandong Ma Shanpei Hu Meng He Hao Yu Qingbiao Wang Xiaoqiang Cao Xiaofang You | 2021 | International Journal of Mining Science and Technology2021，31，3： | 4 |
| 2 | Statistical Stacking and Adaptive Notch Filter to Remove High-LevelElectromagnetic Noise from MRS Measurements 显示文摘 | JIANG Chuandong LIN Jun DUAN Qingming | 2011 | Near Surface Geophysics2011，9，5： | 1 |
| 3 | Nonequilibrium effects of reactive fiow based on gas kinetic theory显示文摘How to accurately probe chemically reactive fiows with essential thermodynamic nonequilibrium effects is an open issue.Via the Chapman–Enskog analysis,the local nonequilibrium particle velocity distribution function is derived from the gas kinetic theory.It is demonstrated theoretically and numerically that the distribution function depends on the physical quantities and derivatives,and is independent of the chemical reactions directly as the chemical time scale is longer than the molecular relaxation time.Based on the simulation results of the discrete Boltzmann model,the departure between equilibrium and nonequilibrium distribution functions is obtained and analyzed around the detonation wave.In addition,it has been verified for the first time that the kinetic moments calculated by summations of the discrete distribution functions are close to those calculated by integrals of their original forms. | Xianli Su Chuandong Lin | 2022 | Communications in Theoretical Physics2022，74，3： | 1 |
| 4 | Study of sodium lignosulfonate prepare low-rank coal-water slurry:Experiments and simulations显示文摘The effect of sodium lignosulfonate(SL)as additive on the preparation of low-rank coal-water slurry(LCWS)was studied by experiments and molecular dynamics(MD)simulation s.The experimental results show that the appropriate amount of additives is beneficial to reduce the viscosity of LCWS and increase the slurry concentration.Adsorption isotherm studies showed that SL conforms to single-layer adsorption on the coal surface,andΔG_(ads)^(0) was negative,proving that the reaction was spontaneous.Zeta potential measurements showed that SL increased the negative charge on coal.FTIR scanning and XPS wide-range scanning were performed on the coal before and after adsorption,and it was found that the content of oxygen functional groups on coal increased after adsorption.Simulation results show that when a large number of SL molecules exist in the solution,some SL molecules will bind to hydrophobic hydrocarbon groups on coal.The rest of the SL molecule s,their hydrophobic alkyl tails,come into contact with each other and aggregate in solution.The agglomeration of SL molecules and the surface of coal with static electricity will also produce electrostatic interaction,which is conducive to the even dispersion of coal particles.The results of mean square displacement(MSD)and self-diffusion coefficient(D)show that the addition of SL reduces the diffusion rate of water molecules.Simulation results correspond to experimental results,indicating that MD simulation is accurate and feasible. | Lin Li Chuandong Ma Mengyu Lin Mingpu Liu Hao Yu QingbiaoWang Xiaoqiang Cao Xiaofang You | 2021 | Chinese Journal of Chemical Engineering2021，34，1： | 1 |
| 5 | A Methodto Observe Fast Dynamic Space Charge in Thin DielectricFilms显示文摘 | Zheng Feihu Lin Chen Liu Chuandong | 2012 | Applied Physics Letters2012，101，17： | 1 |
| 6 | Unsteady detonation with thermodynamic nonequilibrium effect based on the kinetic theory显示文摘In this paper,unsteady detonation is simulated and investigated from the viewpoint of kinetic theory.The deviations of the velocity distribution function from the equilibrium state are studied in the evolution of detonation.It has been discovered that the characteristics of the deviation around the detonation wave are significantly different from those in the post-wave region.Besides,the kinetic moments of the reaction term have been simulated,verified and analyzed in detail.In addition,the reaction manifestation is defined to describe the global effects of kinetic moments due to chemical reactions.It is interesting to find that there are three types of periodic oscillations of the reaction manifestation during the evolution of the unsteady detonation.Via the fast Fourier transform,it can be seen that the reaction manifestation is mainly composed of several signal frequencies.Moreover,the impact of rate constants of the two-step reaction scheme on the reaction manifestation is studied,and the influence of chemical heat is investigated as well. | Xianli Su Chuandong Lin | 2023 | Communications in Theoretical Physics2023，75，7： | 0 |
| 7 | Influence of the tangential velocity on the compressible Kelvin–Helmholtz instability with nonequilibrium effects显示文摘Kelvin–Helmholtz(KH)instability is a fundamental fluid instability that widely exists in nature and engineering.To better understand the dynamic process of the KH instability,the influence of the tangential velocity on the compressible KH instability is investigated by using the discrete Boltzmann method based on the nonequilibrium statistical physics.Both hydrodynamic and thermodynamic nonequilibrium(TNE)effects are probed and analyzed.It is found that,on the whole,the global density gradients,the TNE strength and area firstly increase and decrease afterwards.Both the global density gradient and heat flux intensity in the vertical direction are almost constant in the initial stage before a vortex forms.Moreover,with the increase of the tangential velocity,the KH instability evolves faster,hence the global density gradients,the TNE strength and area increase in the initial stage and achieve their peak earlier,and their maxima are higher for a larger tangential velocity.Physically,there are several competitive mechanisms in the evolution of the KH instability.(i)The physical gradients increase and the TNE effects are strengthened as the interface is elongated.The local physical gradients decrease and the local TNE intensity is weakened on account of the dissipation and/or diffusion.(ii)The global heat flux intensity is promoted when the physical gradients increase.As the contact area expands,the heat exchange is enhanced and the global heat flux intensity increases.(iii)The global TNE intensity reduces with the decreasing of physical gradients and increase with the increasing of TNE area.(iv)The nonequilibrium area increases as the fluid interface is elongated and is widened because of the dissipation and/or diffusion. | Yaofeng Li Huilin Lai Chuandong Lin Demei Li | 2022 | Frontiers of physics2022，17，6： | 0 |
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