where refers to the total volumetric flowrate of both opposed inlets. The extensional strain rate was measured over the concentration range used in this work at 1, 3, and 10 mg/mL for both PII-2T in CB and CB/DMF solutions. The experimental and theoretical extensional strain rates are shown in Figure . Although there is some variation due to framerate limitations at the higher flowrates, the deviations are not systematic in terms of either the concentration or the flowrate and they do not vary exponentially as would be expected for instabilities or strong modifications to the flow structure. While the framerate limitations of our high speed camera make it difficult to accurately measure the higher strain rates, the experimental and theoretical Newtonian strain rates agree well at low flowrates so we use the above relation to determine the extensional strain rates for the retardance experiments.