effects of grid spacer with mixing vane on entrainments and depositions in two-phase annular flows
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2015
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Abstract
The effects of mixing vanes (MVs) attached to a grid spacer on the characteristics of air–water annular flows were experimentally investigated. To know the effects, a grid spacer with or without MV was inserted in a vertical circular pipe of 16-mm internal diameter. For three cases (i.e., no spacer, spacer without MV, and spacer with MV), the liquid film thickness, liquid entrainment fraction, and deposition rate were measured by the constant current method, single liquid film extraction method, and double liquid film extraction method, respectively. The MVs significantly promote the re-deposition of liquid droplets in the gas core flow into the liquid film on the channel walls. The deposition mass transfer coefficient is three times higher for the spacer with MV than for the spacer without MV, even for cases 0.3-m downstream from the spacer. The liquid film thickness becomes thicker upstream and downstream for the spacer with MV, compared with the thickness for the spacer without MV and for the case with no spacer.
| Reference Key |
kawahara2015nucleareffects
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|---|---|
| Authors | ;Akimaro Kawahara;Michio Sadatomi;Shogo Imamura;Yuta Shimoharai;Yudai Hirakata;Masato Endo |
| Journal | Journal of hazardous materials |
| Year | 2015 |
| DOI |
10.1016/j.net.2015.04.002
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