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ANSYS Static Structural:
ANSYS Static Structural was used to make some FEA analysis simulations so that we can predict how the membrane would stretch under diferent pressures and what pressure is the correct so that the membrane stretches 20%.
Figure 1. X-axis deformation in ANSYS Static Structural as -0.00035 MPa is applied in the pressure chambers.
Figure 2. Y-axis deformation in ANSYS Static Structural as -0.00035 MPa is applied in the pressure chambers.
Figure 3. X-axis deformation gif in ANSYS Static Structural showing the membrane deformation as -0.00035 MPa is applied in the pressure chambers.
ANSYS Fluent:
To confirm that the device would have constant shear stress, steady state ANSYS Fluent simulations were performed. A Hele-Shaw device similar in structure to the final design was modeled as shown in Figure 4. The parameters used for the simulation can be seen in table 1.
Figure 4. Hele-Shaw fluid model used for validations of fluid flow.
The modeled fluid element consisted of a 70 mm long and 40 mm wide rectangular shell. The thickness was set as 1 mm. At either end, a small cylindrical region of 6.25 mm in diameter was added to represent the tubing that would be entering and exiting the Hele-Shaw cell.
To validate that shear stress was changing minimally near the center of the Hele-Shaw cell, the percent change in wall shear stress relative to the shear stress at (X,Z) = (35, -20) mm was calculated and graphed as a 2D plot (see Figure 5).
Figure 5: Shear stress in pascals versus x in mm over x = 0 to 100 mm (left). Points taken at z = -25 mm and y = 0 mm. Zoomed in version over x = (40, 60) mm (right).
It can be seen that near the center of the Hele-Shaw cell, the percent change of the wall shear stress was never more than 10 percent.
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