Original articles: Distribution of void fraction in bubbly flow through a horizontal Channel: Bubbly boundary layer flow, 2nd report

摘要

A method of enveloping the hull with a sheet of microbubbles is discussed. It forms part of a study on means of reducing the skin friction acting on a ship's hull. In this report, a bubble traveling through a horizontal channel is regarded as a diffusive particle. Based on this assumption, an equation based on flow flux balance is derived for determining the void fraction in approximation. The equation thus derived is used for calculation, and the calculation results are compared with reported experimental data. The equation is further manipu- lated to make it compatible with a mixing length model that takes into account the presence of bubbles in the liquid stream.