2019 Volume 36 Issue 4 Pages 327-
We propose erythritol slurry, which is the mixture of erythritol solution and erythritol crystal, as a slurry heat medium for medium-low temperature (200 °C or less) such as industrial exhaust heat and solar heat. The purpose of this study is to understand the heat transfer characteristics of erythritol slurry. In the experiment, erythritol slurry was flowed through a stainless steel tube heated with a uniform heat flux, and the local heat transfer coefficient was measured with changing the solid fraction and Reynolds number as parameters. The local heat transfer coefficient of a cross section of the tube was investigated. In laminar flow, the local heat transfer coefficient at the side of the tube and that at the bottom of the tube are higher than the theoretical values of single phase flow. In turbulent flow, the difference of heat transfer coefficient between experimental values and theoretical values of single phase flow is small. It means the influence of the solid fraction on the heat transfer coefficient is small in the turbulent flow. From the results, it was confirmed that the influence of the solid fraction and the flow pattern on the local heat transfer coefficient in the laminar flow is large. We suggested that the flow pattern should be considered in design of the system using the erythritol slurry.
