Abstract
A finite-volume code and the SIMPLE scheme are used to study the transport and deposition of nanoparticles in a rotating curved pipe for different angular velocities, Dean numbers, and Schmidt numbers. The results show that when the Schmidt number is small, the nanoparticle distributions are mostly determined by the axial velocity. When the Schmidt number is many orders of magnitude larger than 1, the secondary flow will dominate the nanoparticle distribution. When the pipe corotates, the distribution of nanoparticle mass fraction is similar to that for the stationary case. There is a “hot spot” deposition region near the outside edge of bend. When the pipe counter-rotates, the Coriolis force pushes the region with high value of nanoparticle mass fraction toward inside edge of the bend. The hot spot deposition region appears inside the edge. The particle deposition over the whole edge of the bend becomes uniform as the Dean number increases. The corotation of pipe makes the particle deposition efficiency a reduction, while high counter-rotation of pipe only slightly affects the deposition efficiency. When two kinds of secondary flows are coexisting, the relative deposition efficiency is larger than that for the stationary case.
Highlights
Our surroundings are filled with thousands of kinds of nanoparticles
When a pipe rotates about an axis normal to a plane including the center line of the pipe, the Coriolis force could contribute to the generation of the secondary flow
Daskopoulos and Lenhoff8 examined steady, fully developed Newtonian flow in circular rotating tubes of small curvature. They found that when rotation is in the same direction as the axial flow, the flow structure remains with two- or fourvortex secondary flow; when rotation opposes the flow, the direction of the secondary flow may be reversed at higher rotational strengths
Summary
Our surroundings are filled with thousands of kinds of nanoparticles. A mechanism of the motion of these nanoparticles is of interest and has been investigated for decades. Daskopoulos and Lenhoff examined steady, fully developed Newtonian flow in circular rotating tubes of small curvature. They found that when rotation is in the same direction as the axial flow, the flow structure remains with two- or fourvortex secondary flow; when rotation opposes the flow, the direction of the secondary flow may be reversed at higher rotational strengths. Ishigaki studied on the forced convective heat transfer in loosely coiled rotating pipes theoretically and numerically. They studied the function of four characteristic parameters, i.e., the Dean number, the body force ratio F, the Rossby number, and the Prandtl number, and found that the former three parameters controlled the flow while the last one governed the heat transformation
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