Macromolecular condensed state involves crystalline state and non-crystalline state of long-chain synthetic and naturally occurring molecules. The noncrystalline state may be a polymeric fluid, a rubbery elastic semi-...Macromolecular condensed state involves crystalline state and non-crystalline state of long-chain synthetic and naturally occurring molecules. The noncrystalline state may be a polymeric fluid, a rubbery elastic semi-solid or a rigid glass.展开更多
The problem of a creeping flow of Newtonian fluid extruded from a plane slit or a circular pipe.in the absence of gravity,is simulated successfully by using the continuous-pressure-element method,the discontinuous-pre...The problem of a creeping flow of Newtonian fluid extruded from a plane slit or a circular pipe.in the absence of gravity,is simulated successfully by using the continuous-pressure-element method,the discontinuous-pressure-element method,the consistant penalty method,the reduced integration penalty method and the modified reduced integration penalty method proposed by Oden.Through comparisons between these methods,it is convinced that the discontinuous-pressure interpolation schemes result in more accurate mass conservation and,consequently,more rapid convergence of the free-surface iteration than the continuous one does.The reduced integration penalty method can further reduce the cost of computation while retaining sufficient accuracy of the solution.展开更多
The cross-cultural study on noise problems has been taken by Chinese. The questionnaire for the survey on noise problems was translated from Japanese and the subjects are 402 students in universities. The results are ...The cross-cultural study on noise problems has been taken by Chinese. The questionnaire for the survey on noise problems was translated from Japanese and the subjects are 402 students in universities. The results are summarized.展开更多
A mathematical model for describing gas solid two phase steady mixed convection with phase change has been developed and numerical calculation methods presented.A melting liquid droplet failing a counter gas currenl e...A mathematical model for describing gas solid two phase steady mixed convection with phase change has been developed and numerical calculation methods presented.A melting liquid droplet failing a counter gas currenl expe- riences three processes,cooling of liquid droplet,solidification and cooling of the solid particle.The turbulent model used for Rayleigh number greater than 10~6 is a two equation(k—ε)model of turbulence.For phase change,an improved enthalpy method with varied time step is proposed.The gas particle two phase flow is described by using Eulerian-Lagrangian approach.Modified SIMPLE algorithm and Runge-Kutta method are used in interative calcu- lation.As an example of calculation,the flow in a special 2-dimensional axi-symmetrical prilling tower of diameter 20 m and height 50 m has been performed.Buoyancy effect is important for moving droplet with phase change. The model to be developed and analysis of results obtained in this paper are useful for engineering design in indus- try.展开更多
文摘Macromolecular condensed state involves crystalline state and non-crystalline state of long-chain synthetic and naturally occurring molecules. The noncrystalline state may be a polymeric fluid, a rubbery elastic semi-solid or a rigid glass.
文摘The problem of a creeping flow of Newtonian fluid extruded from a plane slit or a circular pipe.in the absence of gravity,is simulated successfully by using the continuous-pressure-element method,the discontinuous-pressure-element method,the consistant penalty method,the reduced integration penalty method and the modified reduced integration penalty method proposed by Oden.Through comparisons between these methods,it is convinced that the discontinuous-pressure interpolation schemes result in more accurate mass conservation and,consequently,more rapid convergence of the free-surface iteration than the continuous one does.The reduced integration penalty method can further reduce the cost of computation while retaining sufficient accuracy of the solution.
文摘The cross-cultural study on noise problems has been taken by Chinese. The questionnaire for the survey on noise problems was translated from Japanese and the subjects are 402 students in universities. The results are summarized.
文摘A mathematical model for describing gas solid two phase steady mixed convection with phase change has been developed and numerical calculation methods presented.A melting liquid droplet failing a counter gas currenl expe- riences three processes,cooling of liquid droplet,solidification and cooling of the solid particle.The turbulent model used for Rayleigh number greater than 10~6 is a two equation(k—ε)model of turbulence.For phase change,an improved enthalpy method with varied time step is proposed.The gas particle two phase flow is described by using Eulerian-Lagrangian approach.Modified SIMPLE algorithm and Runge-Kutta method are used in interative calcu- lation.As an example of calculation,the flow in a special 2-dimensional axi-symmetrical prilling tower of diameter 20 m and height 50 m has been performed.Buoyancy effect is important for moving droplet with phase change. The model to be developed and analysis of results obtained in this paper are useful for engineering design in indus- try.
