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In laminar flow, instantaneous mean velocity and instantaneous velocity profile are dependent upon history of motivating force or piezometric-pressure gradient; in turbulent flow, strong lateral diffusion of turbulent eddies tends to eliminate dependence of velocity distribution upon history of motion; greater degree of generalization of results appears to be possible for unsteady turbulent flow in pipe than for laminar flow.
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Carstens et al. (1959) studied this question.
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