\ SLIT n ADJUSTABLE 3 MM GHT INTERRUPTER u -CAMERA Fig. 2. Die cross section and light path. A, B, C = velocity curve fit parameters A~A = cross-sectional area at section lA, Figure 8 Aw = interfacial area between sections 1A and 2, Figure 8 B = die swell, ratio of die and extrudate area or widths K = ratio of average square to the square of the average of the velocity pa = atmospheric pressure Re = Reynolds number, u D p /~ 8 , = transverse velocity component vy = axial velocity component 1A = average of the square of the velocity in the 1 direction at section 1A
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