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sec12-010_022410

# sec12-010_022410 - CbE 120B H eat Transfer Turbulent Flow...

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CbE 120B Heat Transfer Turbulent Flow Heat Transfer Analyzing heat transfer with turbulent flow, we are stuck in a bad place analytically. We cannot begin to solve the equations of motion for an isothermal flow, much less for a flow with changing temperature. To develop the necessary engineering relations between the Nussett's number, Reynolds' number and other measurable characteristics of turbulent flow, we use analogies to give us the relevant parameters to describe the situation: Reynolds stated two mechanisms contribute to the transport of heat: 1) Internal diffusion of the fluid when at rest 2) Eddies caused by bulk motion which continually brings fresh fluid into contact with the surface. H=At+Bpvt t = temperature difference p = density v = bulk velocity A,B = constants H = heat transmitted I area-time An analogous equation was written for fluid friction R=A'v +B' p v 2 Reynold's intuition led to the belief A a A' B a B' or h a f Consider bulk flow through a pipe at fluid temperature tb and pipe temperature ts. the four

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sec12-010_022410 - CbE 120B H eat Transfer Turbulent Flow...

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