How do you calculate the minimum film thickness?

AI Thread Summary
To calculate the minimum film thickness between a smooth plate and one with a square microasperity, the height of the microasperity (denoted as 'a') is essential. The minimum film thickness (denoted as 'b') can be determined using specific formulas that relate these two parameters. The attached paper provides a graph illustrating this relationship, which likely derives from empirical data or theoretical models. Understanding the context and methodology used in the paper can clarify how the graph was constructed. Additional details about the surfaces or conditions may further aid in accurate calculations.
tomallan
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Hi,

i am wondering how do you calculate the minimum film thickness between two plates, one smooth surface and another surface with a square microasperity. i am just very confused as to how do you determine the film thickness in between them.

I have attached a paper which has a graph on the minimum film thickness and I am wondering how did they arrive with that graph. It said on the paper that b is the minimum film thickness and a is the height of the microasperity.

any help will be appreciated
 

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