PS6-11-solution

# PS6-11-solution - Homework Solution#6 MEMS MECE E4212...

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Homework Solution #6 MEMS – MECE E4212 Problem #1 The force balance on the beam must take into account the surface tension, γ , over the circumference of the drop, and the pressure difference between the drop and the ambient air. 2 sin 2 R P R F π α γ + = The pressure difference is given by P = P i – P o . To find P, analysis of the curved surface between the droplet and the air gives the following force balance: = a R P 1 1 where cos 2 h a = = = 6 1 30 cos 2 6 5 . 1 1 3 72 cos 2 1 E E E h R P Pa P 282 , 118 = A more simplified method of balancing the forces between the droplet and the air gives P as the

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## This note was uploaded on 02/05/2012 for the course APMAE 4200 taught by Professor R during the Fall '11 term at Columbia.

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PS6-11-solution - Homework Solution#6 MEMS MECE E4212...

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