Microprofile Extrusion with a Conformal Fluidic Layer and a Wall Slip Condition

摘要

@@Highly noncircular fibers with a precision microprofile are highly demanded in the emerging biochemical, biomedical, and telecommunication technology. As compared to a circular filament, a microprofile possesses second-order effects caused by its highly noncircular cross-section. The crosssectional shape influences significantly the mechanical, physical, chemical, and biological functions of the fiber. However, highly noncircular shapes are difficult to produce using the current melt spinning technology. Figure 1 shows some examples of the typical shape change from the spinneret orifice to the fiber. Die swell and surface tension are considered to be the main causes for shape change. There are two types of driving forces for die swell; one is velocity redistribution and the other is viscoelstic recovery.