Abstract
The pumping effectiveness of the micro T-junction with the oscillatory flow was examined. At one end of the top bar of T, there was a closed tank; Tank 1, that was solid with water. At another end of the top bar of T, there was a tank; Tank 2, that was open to the atmosphere. At the bottom end of the vertical branch of T, there was also a tank; Tank 3, that was open to the atmosphere. In Tank 2 and Tank 3, free surface of water was formed. The 1mm×1 mm cross-section flow path of the 20mm long top bar and 10mm long vertical branch of T were filled with water. By causing boiling and condensation of a bubble cyclically in Tank 1, back-and-forth flow was created at the T-junction. Water surface level in Tank 2 was higher than that in Tank 3. Difference between surface level height in Tank 2 and in Tank 3 was mainly dominated by a back-and-forth velocity at the T-junction. The flow system tested in experiments was simulated by a commercial flow analysis code of STAR-CD. It was confirmed that mass relocation from Tank 3 to Tank 2 occurred when the back-and-forth flow was imposed at the T-junction. The vortical movement around the entry of the branch to Tank 3 that was caused by the back-and-forth flow seemed to cause mass relocation, i.e. the level height difference between Tank 2 and Tank 3.
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