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23 August, 13:11

Determine the pressure difference that is required to fill a cell phone housing in one tenth of a second. Model the shape as a flat plate that is injected over its full width, assume Newtonian behavior, and use a viscosity μ = 36 Pa. s.

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  1. 23 August, 16:36
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    P1 - P2 = 276 x 10^5 pa

    Explanation:

    Here we are provided with the following dа ta:

    Viscosity (µ) = 36 pa. s

    Thickness (t) = 1.5 mm

    Length (L) = 120 mm

    time (s) = 1/10 = 0.1 sec

    velocity = v = L/s = 120/0.1

    v = 1200 mm/sec

    Now we will calculate the pressure difference using the formula of flat plate.

    P1-P2 = 12 (μ*v*L) / t^2

    here P1 and P2 are the pressures,

    Substituting values in the formula above

    P1 - P2 = (12*36*1200*120) / (1.5^2)

    P1 - P2 = 276 x 10^5 pa
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