03_f416M_sed-transport_handout

03_f416M_sed-transport_handout - So What do we need to know...

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So What do we need to know Flow types Flow processes How these control sediment movement or control/influence sedimentation How these are represented in the rock record To begin: What forces control the behavior of fluids: Inertial forces Gravitational forces Viscous forces 1
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2 Fluid (def): Cannot withstand any tendency by a deviatoric stress to deform it (i.e., has no strength) Gas – loose configuration of molecules - AIR Liquid – tighter configuration of molecules. Can form a free surface. - WATER Properties of Fluid relevant to the study of sediment transport ρ = density μ = dynamic viscosity (a measure of the ____________ of a fluid) has units of stress/strain rate → Pa/(1/t) = Ns/m 2 = Pa s Sediment Transport and Fluid Flow
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3 s m m kg ms kg 2 3 = = ρ μ υ Air μ ~ 10 -5 Pa s Water (20°C) μ = 10 -3 Pa s Ice μ ~ 10 10 Pa s Air ρ ~ 1 kg/m 3 Water ~ 10 3 kg/m 3 Ice ρ ~ 10 3 kg/m 3 Properties of Flow relevant to the study of sediment transport U L = scale _______ = scale _______ L g U Fr = L U = Re
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4 REYNOLDS NUMBER DIFFERENCE IN LAMINAR AND TURBULENT FLOW ARISE FROM THE RATIO OF INERTIAL FORCES TO VISCOUS FORCES INERTIAL FORCES ARE RELATED TO THE SCALE AND VELOCITY OF FLUIDS IN MOTION AND CAUSE TURBULENCE VISCOUS FORCES INCREASE WITH INCREASING VISCOSITY OF THE FLUID AND RESIST DEFORMATIN OF A FLUID AND SUPPRESSES TURBULENCE
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5 Reynolds Number Re <1 ________ flow : _______ to small disturbances
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This note was uploaded on 09/15/2011 for the course GEO 27565 taught by Professor Fisher during the Spring '11 term at University of Texas.

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03_f416M_sed-transport_handout - So What do we need to know...

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