Figure P5.94 shows the mixing of two streams. The shear stress between each fluid and its adjacent walls is negligible. Why can't Bernoulli's equation be applied between points in stream 1 and the mixed stream or between points in stream 2 and the mixed stream?

Figure P5.94

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P = 50 psia 2 ft p = 62.4 lbm/ft 2 ft p = 62.4 lbm/ft P = 50 psia 5 ft/s 10 ft/s P3