Thermophysical Properties for ASK Chemical and Exochem Riser Sleeves for Steel Castings

In order to predict the performance of a riser sleeve using simulation software, the thermophysical properties of that sleeve must be known. Current literature gives little to no information about these properties. Some manufacturers have given these properties as an optional module for simulation software without revealing their actual values. The accuracy of these “black box” properties is uncertain. In this paper, progress in determining these properties is detailed. In particular, properties are developed for five unique sleeves from two separate manufacturers, Exochem and ASK Chemicals. According to the manufacturers’ information, two sleeves are said to be insulating and three sleeves are exothermic. Temperature dependent sleeve properties such as the thermal conductivity and the specific heat are determined by matching casting simulation results to results from casting experiments. Exothermic properties such as ignition temperature, burn time, and heat generation are determined in the same manner. Once the thermophysical properties of these riser sleeves have been determined, the sleeves are compared on the basis of heat diffusivity, the product of density, specific heat, and thermal conductivity.