A mixture of helium and xenon will be used as the working fluid for the Dynamic Isotope Power Subsystem (DIPS). The mixture of these two inert gases results in a relatively low Prandtl Number (∼0.25). This is outside the range of the correlations used to predict the heat transfer coefficients. Therefore, tests were conducted in the laminar regime, and the results showed that the heat transfer rates were about 7% lower for Peclet Numbers (RePr) down to 700. The test data was used to develop a new correlation and applicable range.

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