Role of Extensional Stresses on the Interfacial Stability of Multiphase Flow Processes

拉伸应力对多相流过程界面稳定性的作用

• 批准号: 8914354
• 负责人: Bamin Khomami
• 金额: $ 27.2万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8914354&HistoricalAwards=false
• 关键词: Role; Extensional; Stresses; Interfacial; Stability

A primarily experimental research program will be carried out on the existence and growth of interfacial instabilities which can occur in the coextrusion of polymer melts. Dies equipped with pressure transducers and optical windows will be used to determine interface deformation and wall stresses in the coextrusion of various combinations of resins. Required rheological characterizations will also be carried out. A theoretical stability analysis will complement the experiments. The instabilities to be investigated are detrimental to the processing of multilayer films or fibers through coextrusion. Their understanding and control is of great importance in materials processing.

将对聚合物熔体共挤出过程中可能发生的界面不稳定性的存在和增长进行初步的实验研究。配有压力传感器和光学窗口的模具将用于确定各种树脂组合共挤出时的界面变形和壁面应力。还将进行所需的流变学表征。理论稳定性分析将是对实验的补充。待研究的不稳定性不利于共挤多层膜或纤维的加工。它们的理解和控制在材料加工中具有重要意义。