Type 2 diabetes(T2DM)is a common metabolic disorder associated with environmental and genetic factors characterized by both insulin resistance and relative insufficiency of insulin secretion.T2DM has a high genetic pr...Type 2 diabetes(T2DM)is a common metabolic disorder associated with environmental and genetic factors characterized by both insulin resistance and relative insufficiency of insulin secretion.T2DM has a high genetic predisposition.It is reported that 40% of first-degree relatives of patients with T2DM may develop diabetes;however,the incidence rate is only 6% in the general population[1].展开更多
The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial slippage.For now,it is a hotspot to gr...The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial slippage.For now,it is a hotspot to grasp the slippage characteristic and explore slippage enhancement strategies.This paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface(SLI)of hydrophobic surfaces(HS)and the gas-liquid interface(GLI)of superhydrophobic surfaces(SHS)in recent years,but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of SHS.First,we used the molecular dynamics(MD)simulation method to figure out the effect of the solid-liquid interaction strength,the system temperature and the shear rate on the slippage of SLI,and expound their action mechanism from molecular scale.Then,by MD and multibody dissipative particle dynamics(MDPD)method,the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving velocity.We proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on GLI.In addition,we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants,and the backflow direction will reverse with the change of GLI morphology.Finally,we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.展开更多
基金supported by the National Natural Science Foundation of China[Grants 81300702 to L.L.Z.]the Natural Scienceof Chongqing CSTC[cstc2018jcyjAXO210 to L.L.Z.]。
文摘Type 2 diabetes(T2DM)is a common metabolic disorder associated with environmental and genetic factors characterized by both insulin resistance and relative insufficiency of insulin secretion.T2DM has a high genetic predisposition.It is reported that 40% of first-degree relatives of patients with T2DM may develop diabetes;however,the incidence rate is only 6% in the general population[1].
基金the Youth Science Fund Project of the National Natural Science Foundation of China(Grant No.12102358)the China Postdoctoral Science Foundation(Grant No.2020M692617)+3 种基金the Fundamental Research Funds for the Central Universities(Grant No.3102021HHZY030008)Natural Science Foundation of Chongqing of China(Grant No.cstc2021jcyj-msxmX0393)the Young Talent Fund of Association for Science and Technology in Shaanxi,China(Grant No.20220512)Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology(Grant No.LabASP-2022-05).
基金supported by the National Natural Science Foundation of China(Grant Nos.52071272,52201382,12102358).
文摘The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial slippage.For now,it is a hotspot to grasp the slippage characteristic and explore slippage enhancement strategies.This paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface(SLI)of hydrophobic surfaces(HS)and the gas-liquid interface(GLI)of superhydrophobic surfaces(SHS)in recent years,but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of SHS.First,we used the molecular dynamics(MD)simulation method to figure out the effect of the solid-liquid interaction strength,the system temperature and the shear rate on the slippage of SLI,and expound their action mechanism from molecular scale.Then,by MD and multibody dissipative particle dynamics(MDPD)method,the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving velocity.We proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on GLI.In addition,we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants,and the backflow direction will reverse with the change of GLI morphology.Finally,we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.
