抄録
Measurements of void-fraction distributions around a tube across horizontal tube bundle in liquid-gas two-phase flow were carried out using a void probe technique. Horizontal tube bundle was set in a vertical rectangular channel with 90 × 90 mm^2, and the tube layout was in-line. Outer diameter of the tube was 15 mm, and the pitch to the diameter ratio was 1.5. Void-fraction distributions were compared between 1^<st>, 4^<th> and 7^<th> rows in the 2^<nd> column, and between 1^<st> and 2^<nd> column in 4^<th> row. Furthermore, void-fraction distributions at 4^<th> row in the 2^<nd> column were measured by the void-probes with different length. Void-fraction distributions at 4^<th> and 7^<th> rows were almost the same with each other, and it was confirmed that the inlet effect could be neglected at 4^<th> row. Void-fraction distributions at the 1^<st> column facing on the wall surface was different from at the 2^<nd> column, and it were strongly influenced by the wall surface.
