film becomes independent of "z" and of constant wall thickness.
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After an initial development at the top of the wall it attains a fully-developed draining vertical oil- film wherein the film becomes independent of "z" and of constant wall thickness.
Let the vertical velocity as (w) and using the nomenclatures in the figure such as distance from plate (x), fluid properties, gravity (g) and film thickness ( delta ).
![Oil film
Air
P, µ
-8-](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F669d4a79-2169-42a9-b2ae-e9252928d27f%2F5df2884b-8e31-4902-b121-f1e0d1f46021%2F72ysi8f_processed.png&w=3840&q=75)
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