Thermal Characteristics And Thermal Management Based On Phase Change Materials Of Lithium Battery

With the increasing expansion of rubber market at home and abroad,the quality requirements of rubber products are also increasing accordingly.Rubber rubber is often used in the daily by the entrance of the extruder head,into the nose flow passage,through export die extrusion,final result need rubber extrusion products,and ultimately affect the quality of rubber products is the key factor is the uniformity of the exit velocity,therefore on the nose is particularly critical for the reasonable design of flow channel.In this paper,the numerical simulation method is used to optimize the design of the nozzle passage of five composite extruders,and the flow characteristics of rubber material in each flow passage are studied.On initial branch flow velocity,wall pressure and wall shear stress analysis,in addition to the inevitable on-way resistance caused by the energy loss,damping area and distribution area larger regional happened this two places due to the shape of mutations that cause rubber rubber under the direction of the large resistance in the process of flow and deformation resistance,at the same time will produce large amounts of energy loss,As a result,the pressure drop of the inlet and outlet will be further increased,and the velocity at the outlet will be uneven.The velocity value in the middle is higher than the velocity value around.With the increase of the height of the damping block in the flow passage of the extruder nose,the velocity uniformity of the velocity at the exit is greatly affected,and the pressure drop at the entrance and exit is also increasing.The shear stress on the wall is more obvious due to the abrupt change of the upper part of the damping block,and the shear stress is also increasing correspondingly.As the width of damping block increases,the uniformity of outlet velocity changes obviously,the pressure drop and shear stress increase slightly.The abrupt change of the upper part of the rectangular shape damper block is larger than that of the other two shapes,so the pressure drop and shear stress caused by the rectangular shape damper block are the largest,followed by the trapezoidal shape damper block and the triangular shape damper block.In terms of the influence on the uniformity of exit velocity,The middle velocity of the outlet velocity of the rectangular damper block is smaller than that of the other two kinds of damper blocks,and the velocity on both sides is larger.Therefore,within the limit of the geometrical model of the flow channel,the velocity uniformity of the outlet velocity of the rectangular damper block is the best,followed by the trapezoidal damper block,and the triangular damper block is weak.With the increase of the shunt Angle,when the rubber flow flows through the shunt area,the mutation is smaller,the pressure drop caused by it decreases,the shear stress also decreases.In terms of the influence on the uniformity of the outlet velocity,the rubber flow tends to be measured in the flow passage,resulting in the internal flow velocity of the outlet velocity is more and more higher than the outer flow velocity.With the increase of forming length,uniformity of the exit velocity,and a greater influence on the near wall flow pressure,among the exit velocity value,the greater the edge around the speed value is smaller,because of its wall have Great Wall along the resistance,its pressure drop is caused on increases gradually,but not noticeable deformation resistance and flow direction of rubber resistance,Therefore,it has little effect on the shear stress of the wall surface.Proposed sensitivity analysis method is used to redesign the branch flow model of topology optimization,and verified the second topology optimization,according to the topology optimization model,the velocity vector diagram and the flow chart of the redesigned model to carry on the design,analyses the design model and original model after the uniformity of the exit velocity,wall pressure and wall shear stress,and its reasons are analyzed.Combined with the fluid-structure coupling theory,the optimized flow channels were coupled with the composite extruder,and the load and boundary conditions were applied to the composite extruder before and after optimization,and the stress and deformation before and after optimization were observed,and the reliability of the optimization was verified.