水分凝縮層の通気性

抄録

  The degree of steam flow in the moisture condensed layer of the green sand mold is an important factor, as it controls the latent heat transfer and the steam pressure in the mold. Then, ‘steam permeability’ in the moisture condensed layer was measured by the following method. Steam at 100°C was forced into moisture saturated standard specimen. The difference between the steam pressure in the front and back of the specimen, and the volume of steam passing through the specimen were measured. From these two values, steam permeability was calculated according to Darcy's law. Steam permeability was lower than permeability under constant initial moisture content, and there was little difference between them under the same absolute moisture content. This steam permeability can he used as a fundamental data in obtaining the steam pressure distribution and the migration of moisture condensed layer.