To confirm the rheological characteristic of sewage in the research and application of urban sewage source heat pump system, the viscosity of sewage was investigated. The tube-type rheometer was used in this experimen...To confirm the rheological characteristic of sewage in the research and application of urban sewage source heat pump system, the viscosity of sewage was investigated. The tube-type rheometer was used in this experimental study, and the sewage was treated as homogeneous non-Newtonian fluid. In addition, the relational expression between viscosity parameters was developed, and the function of apparent viscosity was obtained. It is concluded that the viscosity characteristic of sewage is influenced largely by complex mixture in sewage, and the sewage has the characteristic of sheared densification fluid.展开更多
Two models based on the hydrostatic primitive equations are proposed.The first model is the primitive equations with partial viscosity only,and is oriented towards large-scale wave structures in the ocean and atmosphe...Two models based on the hydrostatic primitive equations are proposed.The first model is the primitive equations with partial viscosity only,and is oriented towards large-scale wave structures in the ocean and atmosphere.The second model is the viscous primitive equations with spectral eddy viscosity,and is oriented towards turbulent geophysical flows.For both models,the existence and uniqueness of global strong solutions are established.For the second model,the convergence of the solutions to the solutions of the classical primitive equations as eddy viscosity parameters tend to zero is also established.展开更多
The vertical structure of neutrino-dominated accretion flows (NDAFs) in spherical coordinates is revisited.We define the ratio of the neutrino cooling rate to the viscous heating rate per unit volume,f=q v/q vis.The i...The vertical structure of neutrino-dominated accretion flows (NDAFs) in spherical coordinates is revisited.We define the ratio of the neutrino cooling rate to the viscous heating rate per unit volume,f=q v/q vis.The ignition region is presented when f >0.5.The solutions show that NDAF is significantly thick.The ignition region is determined by the mass accretion rate and the viscosity parameter,which can be considered as the neutrino radiation-dominated region.展开更多
基金Sponsored by the National Natural Science Foundation of China (Grant No.50578048)
文摘To confirm the rheological characteristic of sewage in the research and application of urban sewage source heat pump system, the viscosity of sewage was investigated. The tube-type rheometer was used in this experimental study, and the sewage was treated as homogeneous non-Newtonian fluid. In addition, the relational expression between viscosity parameters was developed, and the function of apparent viscosity was obtained. It is concluded that the viscosity characteristic of sewage is influenced largely by complex mixture in sewage, and the sewage has the characteristic of sheared densification fluid.
基金supported by the US Department of Energy grant (No. DE-SC0002624) as part of the "Climate Modeling:Simulating Climate at Regional Scale" programsupported by the National Science Foundation(No. DMS0606671,DMS1008852)
文摘Two models based on the hydrostatic primitive equations are proposed.The first model is the primitive equations with partial viscosity only,and is oriented towards large-scale wave structures in the ocean and atmosphere.The second model is the viscous primitive equations with spectral eddy viscosity,and is oriented towards turbulent geophysical flows.For both models,the existence and uniqueness of global strong solutions are established.For the second model,the convergence of the solutions to the solutions of the classical primitive equations as eddy viscosity parameters tend to zero is also established.
基金supported by the National Basic Research Program of China (Grant No.2009CB824800)the National Natural Science Foundation of China (Grant Nos.10833002,11003016,11073015 and 11103015)the Natural Science Foundation of Fujian Province of China (Grant No.2010J01017)
文摘The vertical structure of neutrino-dominated accretion flows (NDAFs) in spherical coordinates is revisited.We define the ratio of the neutrino cooling rate to the viscous heating rate per unit volume,f=q v/q vis.The ignition region is presented when f >0.5.The solutions show that NDAF is significantly thick.The ignition region is determined by the mass accretion rate and the viscosity parameter,which can be considered as the neutrino radiation-dominated region.
