What are the velocity thermal and concentration boundary

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What are the velocity, thermal and concentration boundary layers? Under what conditions do they all have the same thickness?

a. When are the velocity and thermal boundary layer thicknesses the same ?

b. When are the velocity and concentration boundary layer thickness the same

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What are the velocity thermal and concentration boundary : what are the velocity thermal and concentration boundary layers? under what conditions do they all have the same

Air flows steadily through an adiabatic non-ideal turbine : air flows steadily through an adiabatic non-ideal turbine entering at 150 psia 900degf and 350 fts and leaving at 20

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