Please provide 2b solution

a a 2. (a) Consider a thin PDMS channel bonded to a glass slide. In this case, the channel sidewalls and roof have the same wettability, but the floor has a different wettability. Assuming the contact angles of glass- water is a and that of PDMS-water is B, show that the Laplace pressure jump across the meniscus is given by TcosB + cosa AP=Y + 2005B). [10 points] = h w (b) Consider a thin PDMS channel bonded to glass whose width is 500 um and depth is 20 um. If the three-phase contact angles of water on PDMS and glass are 60 and 30 respectively, what is the instantaneous velocity of the meniscus at 1 mm downstream from the inlet? [10 points]