Abstract
The pressure gradient and temperature distribution in the green sand mold, the amount of gas evolved from the mold and the rate of moisture evaporation were measured. The permeability at different zones in the green sand mold such as the initial zone and the moisture condensed zone was calculated. The gas pressure measured in the mold continuously changes after pouring remarkably near the metal. This change can be well explained by Darcy's law. A close agreement lies between observed and calculated values of the gas pressure change. The influence of various factors such as pouring temperature, additional materials to green sand and squeeze pressure on gas pressure was also examined. The gas pressure is independent of the amount of gas or steam generation, but it changes with the permeability of the mold.
