Investigation on Laminar Flow and Heat Transfer of Helium–Xenon Gas Mixtures with Variable Properties

The space Brayton nuclear reactor system usually adopts the helium–xenon gas mixture (He–Xe) as working fluid. flow of He–Xe in micro channel regenerator is generally laminar. Since properties are significantly different from those common pure gases, impact this difference on laminar and heat transfer needs to be evaluated. In present study, numerical simulations convective for helium, nitrogen conducted by Ansys Fluent. Compared with simulation results, applicability existing friction factor (f) Nusselt number correlations By establishing functions property ratios temperature ratio mixing ratio, a new f correlation property-variable proposed. Results show that calculation error obviously large, exceeding 13%. With correlation, predictions good agreement results fully developed region, reduced 3%.