Spinning velocity gradient profile

Figure 4.6 shows reduced steady-state elastic free energy of deformation, [/ei /ei( = 0)]/i NkT, vs. the processing time, t, computed from (4.28) for melt spinning of PET with the axial velocity gradient shown in Fig. 4.1. Temperature dependence of the chain relaxation time, r(T(t)), is accounted for assuming Arrhenius temperature dependence of the relaxation time and using the axial temperature profile reported in [1]. Reduced elongation rate.

Figure 6 (A) Pulsed gradient spin echo sequence used to encode spin magnetization phase for molecular translational motion. (B) Velocity and diffusion maps for a water molecule flowing through a 2 mm diameter capillary. The images are shown as stackplots. The velocity profile is Poiseuille while the diffusion map is uniform. Courtesy of RW Mair, MM Britton and the author.

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