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- Polytetrafluoroethylene (PTFE) die can greatly inhibit the occurrence of melt fracture or surface distortion of mPE extrudate, the surface appearance of mPE extrudate gets greatly improved, and the critical shear rate increases nearly 3 times. 不同口模材质对mPE挤出口模压力、挤出流量和挤出物表面质量有着显著的影响。 与普通铸铁口模相比;经聚四氟乙烯(PTFE)口模挤出mPE熔体的口模压力降低近60%25;挤出流量增加1.;5倍;表观粘度降低65%25;挤出物表面光滑;基本无缺陷;出现熔体破裂的临界剪切速率提高了近3倍。
- critical shear rate 临界剪切速率
- There exists a distortional flow in slurry at higher shear rate. 药浆存在流动畸变。
- The concept and calculations are proposed for the critical effective shear rate of pipe flow that the friction loss of non-Newtonian crude oil is decreased as the transporting temperature is declined. 相对牛顿流体,当流量增大时,非牛顿原油的摩阻损失增加幅度减小,并且原油流变指数越小,这种趋势越大;
- A direct calculation method of the critical shear stresses was established according to experiment datum on simulated rainfall. 提出了采用人工模拟降雨试验数据直接计算临界抗剪切应力的方法。
- Oxygen precipitates (useful for gettering) can reduce the yield strength (critical shear stress) up to fivefole. 氧沉淀(可用作吸杂)会使屈服强度(临界剪应力)降低为五分之一。
- Oxgen precipitates (useful for gettering) can reduce the yield strength (critical shear stress) up to fivefole. 氧沉淀(可用作吸杂)会使屈服强度(临界剪应力)降低为五分之一。
- Flow-mediated dilatation response normalized to peak shear rate was significantly lower in migraine patients than in controls, the report indicates. 报告指出,流量介导的肱动脉扩张与标准的高峰速度阶差相比,偏头痛病人扩张流量低于对照组。
- The effects of compatibility and shear rate on size and shape of laminar layers are apparent. 体系相容性和外剪切场对层状平板的尺寸及形状有明显的影响。
- It showed that the critical shear stress for cell detachment was relatively low on PHB, thus cells tend to aggregate and detach from surfaces. 在经多聚赖氨酸衣被的表面临界脱离剪应力提高,细胞铺展生长。
- Due to the outstanding shear rate control of the MCR series it is possible to measure a full flow curve with just one revolution of the excentrically rotating sphere. 由于MCR系列精湛的剪切应力控制,只需一个非同心的旋转球体即可测量一个完整的曲线。
- The effective viscosity decreases with the increase of shear rate and temperature, while increases with pressure and foam quality. 其有效粘度随剪切速率、温度的增高而减小,随压力、泡沫质量的增大而增大;
- At low shear rate, the beood of human body perform as Casson fluid, but at high shear rate incline toward Newtonian fluid. 在低剪变率条件下人体血液表现为卡森流体,在高剪变率条件下则趋向于牛顿流体。
- Rheological characterization of this STF confirmed discontinuous shear thickening at a shear rate of approximately 20 s_1 [34]. 流变表征这一因子证实间断剪切增稠在切变率约20 s_1 [ 34 ] 。
- Exerted a sine vibration in parallel direction of melted polymer flow, a characterization formula of meltage shear rate in a capillary was set up. 借助自行研制的恒速型毛细管动态流变实验研究装置,对平行叠加振动条件下聚合物熔体经毛细管的挤出过程进行了分析;
- The shear stress and apparent viscosity of the masterbatch decreased with the increase of the shear rate and temperature. 随着剪切速率的增加,温度升高,剪切应力会降低,母粒的表观黏度也随之降低。
- It was suggested that MBG looked like a Newtonian fluid or a pseudo-plastic fluid under different conditions,and under the shear rate of 52. 结果表明,凉粉草胶溶液在不同的条件下呈牛顿流体或假塑性流体行为,在剪切速率52。
- When the shear rate was high, the cell morphology could be improved by applying a weak vibration, no matter what the foaming system was. 当剪切速率较高时,不论何种发泡体系,施加较弱的振动作用可以改善泡孔的形态;
- Steady shear viscosities for PTT/PBT blends decrease slightly with increasing shear rate, suggesting a slight shear-thinning behavior. PTT/PBT共混物在熔体状态下的稳态剪切粘度随剪切速率的增大而降低,表现为剪切变稀行为。
- The results show that semi-solid ZA12 alloy possesses the thixotropic property, which varies with solid fraction and shear rate. 结果表明半固态ZA12合金具有触变性,其触变性的大小与固相分数和剪切速率有关。