The Thermal Diffusivity/Conductivity of 316 Stainless Steel Powders in Air and Nitric Acid Mixtures at Room Temperature
The thermal conductivity of AISI Type 316 stainless steel powder, both dry and in nitric acid of 3M and 7M concentrations, has been determined both experimentally and with the use of theoretical models.
Using the heat pulse technique the thermal diffusivity was measured for powders of two different particle sizes, 13 and 42 μm mean diameter. Thermal conductivity was derived from diffusivity values using measured density data and specific heat data from the literature. These data were compared with effective thermal conductivity calculated from theoretical models. The agreement was very good in all cases. Differences between the values for the two particle sizes were small.
The thermal conductivity of solid type 316 stainless steel was 13; of type 316 powder in air, 0.2; of type 316 powder under water 3.2; of 316 powder under 3M nitric acid, 2.6; and of type 316 powder under 7M nitric acid, 2.0 W/m.°C.
KeywordsThermal Conductivity Thermal Diffusivity Effective Thermal Conductivity Uranium Dioxide Stainless Steel Powder
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