By Edwin Henry Barton
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Extra info for An introduction to the mechanics of fluids
The entire resistance to mass transfer is due to a stagnant film in the fluid next to the wall. The thickness of the film, δc , is such that it provides the same resistance to mass transfer by molecular diffusion as the resistance that exists for the actual convection process. 3-9) Substitution of Eq. 3-9) into Eq. 3-10) indicates that the mass transfer coefficient is directly proportional to the diffusion coefficient and inversely proportional to the thickness of the concentration boundary layer.
1. Flow on a flat plate. 35 36 3. , the component of the force in the direction of flow, exerted by the flowing stream on the plate. This force can be calculated by integrating the total momentum flux at the wall over the surface area. 1-1) y=0 where τyx |y=0 is the value of the shear stress at the wall. Since the plate is stationary, the fluid in contact with the plate is also stagnant1 and both vx and vy are zero at y = 0. Therefore, Eq. 1-2) y=0 Note that the minus sign is omitted in Eq. 1-2) since the value of vx increases as the distance y increases.
In these correlations all physical properties must be evaluated at the film temperature. 037 ReL − 871) Sc1/3 4/5 ReL > 108 Sc 3000 (G) 4. 2.