Experimental Investigation of Detailed Structure of Gas- Liquid Flow in Rectangular Microchannel

The detailed structure of upward gas-liquid flow of water and nitrogen in a vertical microchannel with a rectangular cross-section 420 × 280 µm was experimentally investigated. The experiments were conducted using the methods of high-speed video and laser-induced fluorescence. In a wide range of flow rates the characteristic regimes of the gas-liquid flow were defined, velocity of elongated bubbles and the local thickness of the liquid film were measured. The dependence of the local film thickness on the capillary number was determined and it was found that the Taylor Law for rectangular channel is not fully implemented due to the deformation of the interface and the contraction of the liquid into the corners of the channel by capillary force.

Keywords:
microchannel, gas-liquid flow, laser-induced fluorescence (LIF).
УДК 532.529.5 

Experimental Investigation of Detailed Structure of Gas- Liquid Flow in Rectangular Microchannel