Experimental study and analysis of a slit die viscometer
Experimental study and analysis of a slit die viscometer
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狭缝模头粘度计的实验研究与分析
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
F. Fernandez
中科院分区：
文献类型：
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作者：
C. Rauwendaal;F. Fernandez
建立了狭缝模头粘度计（SDV）并进行了广泛的评价。SDV的一个主要优点是能够以连续的方式测量在线流变数据，使用最接近真实的挤出过程中遇到的条件的设置。将SDV的粘度数据与毛细管流变仪（CR）和流变机械光谱仪（RMS）的数据进行比较。SDV上测得的粘度值往往低于CR和RMS上测得的粘度值。将讨论这种分歧的可能原因。详细分析了温度对粘度的影响，压力对粘度的影响，以及可压缩性的影响。它将被证明，这些影响可以是实质性的，特别是与某些类型的聚合物。最后，将探索使用缝模粘度计确定第一法向应力差的可行性。
A slit die viscometer (SDV) was built and evaluated extensively. A major advantage of the SDV is the ability to measure in-line rheological data in a continuous fashion, using a setup that most closely approximates the conditions encountered in a real extrusion process. Comparisons will be presented of viscosity data of the SDV to data from a capillary rheometer (CR) and a Rheometrics Mechanical Spectrometer (RMS). Viscosity values as measured on the SDV tend to be lower than those measured on the CR and RMS. Possible reasons for this disagreement will be discussed. The effect of temperature on viscosity, the effect of pressure on viscosity, and the effect of compressibility will be analyzed in detail. It will be shown that these effects can be substantial, particularly with certain types of polymers. Finally, the feasibility of using the slit die viscometer to determine first normal stress differences will be explored.