Abstract
An experimental investigation was carried out on the varying properties of void fraction averaged over a tube cross section in an isothermal fully developed air-water two-phase mixture flowing in a horizontal capillary tube of 1.0mm, 2.4mm and 4.9mm inside diameter, using the constant current method. The flow pattern was observed by video and photograph with streak flashing. Calibration of the void meter was performed using a nonconductive plastic model in bubbly flow, intermittent flow and annular flow. It was found that the scatter of the data of the void fraction was within 20% in each flow region. We obtained correlations between (1) void fraction and gas volume flow rate quality, (2) bubble volocity and total volume flux, (3) lengths of slugs and gas-liquid flow ratio and (4) mean liquid film thickness and pipe diameter
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