Biomedical Engineering Reference
In-Depth Information
element towards the point at which the ield is being computed, dl
is a vector, whose magnitude is the length of the differential element
of the wire, and whose direction is the direction of conventional
current, and B is the magnetic lux density.
Finite-element methods are used to simulate the motion of MSP
moving in hexane, and magnetic ield distributions of the proposed
magnetic steering system. Gauss meter (MG-3002, Sato Inc. Japan) is
used to measure the actual values of magnetic ield.
8.7.7.4 Motion simulation of MSP in hexane
Simulation results supported the feasibility of proposed method for
propelling MSP/MSP cluster moving at desired trajectory to form
speciic shape of MSP model. And the model with MSPs attached on
this surface will be used to fabricate vascular scaffold with porogen
leaching method. Figure 8.30 is a visualization of the solved velocity
distribution of MSP when passing through hexane. The arrows
show the direction of velocity and the background color shows the
distribution of the velocity ield. When MSP moves in hexane, the
viscous resistance force and dynamic pressure force between the
front part and rear part of the MSP can be calculated by integrating
stress tensor on MSP's boundary. Figure 8.31 shows the relation
between the velocity of MSP and drag force from Hexane. In this
igure, the solid line plots the numerical calculation result. We use
MSP with the diameter of 200 μm in this calculation. The viscous
force and pressure difference drag force at MSP's movement direction
increase in proportion to the velocity of MSP and are almost with
equal magnitude at same velocity. The total drag force is about 0.001
μN when MSP with a velocity of 2 mm/s.
V
MSP
Hexane
Figure 8.30 Solved velocity distribution of MSP passing through hexane.
 
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