Material Characterization of Agricultural and Industrial Solutions and Melts in Extensional Processes

延伸过程中农业和工业溶液和熔体的材料表征

• 批准号: 9711109
• 负责人: Stephen Bechtel
• 金额: $ 21万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711109&HistoricalAwards=false
• 关键词: Material; Characterization; Agricultural; Industrial; Solutions

ABSTRACT Proposal Number: CTS-9711109 Principal Investigator: Bechtel, Ohio State This is a grant to characterize materials in the manufacturing and agricultural processes of fiber spinning and spraying. This is an extension of previous research in which analysis and computer codes were created and utilized in experimental measurements of the material properties necessary to characterize behavior in fiber spinning and spraying. Accurate characterization of these properties, specifically dynamic surface tension, elongational viscosity, relaxation times, and others, is critical to the understanding and modeling of these processes. To measure the flow properties relevant to fiber spinning and spraying processes, the rheometer must measure the properties of the fluid in the appropriate state, under the same flow conditions and history, and in the same short time scales. The principal investigators now propose to bring this research to bear on applications developed with an industrial partner (Hoechst Celanese Corporation) and a government agency (US Department of Agriculture), defined by their needs and concerns, and with clear engineering emphasis and payoff. A new rheometer, developed by a colleague, Dr. Kurt Koelling will be used to: (1) undertake a systematic elongational characterization of polymer solutions, employing the technique demonstrated in 1 both to produce the best characterization of a fluid within a given constitutive assumption, and to sift through a battery of proposed constitutive models to select the best model, (2) extend the characterization technique to allow for multiple relaxation times, (3) remove the requirement of a force measurement in the technique, (4) adapt the apparatus for the dynamic measurement of surface tension of newly formed surfaces (on the order of a millisecond), and, on a longer time frame, (5) extend the method to unsteady and non-isothermal behavior, and (6) characterize the coupling of the development of orientation in t he filament to flow. The collaboration with Prof. Koelling will continue.

摘要提案编号：CTS-9711109主要研究者：Bechtel， Ohio State这是一项用于纤维纺丝和喷涂制造和农业过程中材料特性的资助。这是先前研究的延伸，在先前的研究中，分析和计算机代码被创建并用于表征纤维纺丝和喷涂行为所需的材料特性的实验测量。准确表征这些特性，特别是动态表面张力、拉伸粘度、弛豫时间等，对于理解和建模这些过程至关重要。为了测量与纤维纺丝和喷涂过程相关的流动特性，流变仪必须在适当的状态下，在相同的流动条件和历史下，在相同的短时间尺度下测量流体的特性。主要研究人员现在建议将这项研究应用于与工业合作伙伴（赫斯特塞拉尼斯公司）和政府机构（美国农业部）共同开发的应用程序，根据他们的需求和关注点进行定义，并明确工程重点和回报。由他的同事库尔特·柯林博士研制的一种新的流变仪将用于：(1)对聚合物溶液进行系统的拉伸表征，采用1中所展示的技术，在给定的本构假设下对流体进行最佳表征，并筛选一系列提出的本构模型以选择最佳模型，(2)扩展表征技术以允许多次松弛时间，(3)消除技术中对力测量的要求。(4)将仪器用于新形成表面张力的动态测量（毫秒级），并在更长的时间框架内，(5)将方法扩展到非定常和非等温行为，(6)表征灯丝中取向发展与流动的耦合。与Koelling教授的合作将会继续。