Ultimately, for film fluid Reynolds numbers of 880 and above, it was found that a continuously film can be maintained throughout this vertical cylindrical test chamber for all core fluid flow rates attainable in our apparatus.
For large conduction, the evolution of the thread is close to those obtained for a perfectly conducting core fluid.
The microfibers were made using PCL concentrations of 2%, 5%, and 8% in the core fluid with a wide range of sheath-to-core flow rate ratios from 120 5 µL/min to 10 5 µL/min, respectively.
While the core fluid is an entangled polymer melt described using the eXtended Pom-Pom (XPP) model, the sheath layer is a low molecular weight unentangled polymer modeled as an Upper Convected Maxwell (UCM) fluid.
This distinction refers to underlying mechanisms in the core fluid flow, and a clear distinction of features observed in individual data series is not straightforward.
Coaxial core-sheath flows consisting of a cylindrical jet of melting RT27 (core fluid) and annular jet of poly vinyl butyral) (PVB) solution (sheath fluid) are formed in a coaxial microdevice.
These results verify that high-quality nanofibers could be produced as a result of the electrospinnability of the core fluid, regardless of the inability to create solid materials from the shell solution alone via a single-fluid electrospinning.
Therefore, the outer core fluid may be reasonably considered as a perfect conductor, and the process generating field variations is described by the induction equation without the diffusion term.
In this study, we first fabricated coaxial electrospun fibers using a polyvinyl pyrrolidone/bovine serum albumin/rhTGF-β1 composite solution as the core fluid and poly(ε-caprolactone) solution as the sheath fluid.
