This investigation shows a method by which the performance of steam-boiler drum internals can be compared. The method is based on tests carried out with a model filled with Freon 12 liquid and vapor and gives the same density ratio between liquid and vapor which exists in the boiler. When the velocity of the liquid-vapor mixture in the model drum is adjusted to the proper value, then the separation forces in the model and boiler are the same. Freon 12 was selected after tests with water and air had been made but proved to be insufficient. The experiments were performed at different loads, pressures, and liquid levels in the drum. Several different drum internal arrangements were tested, and results and conclusions based on these tests are reported in this paper.

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