Thermal Gravitational Modelling and Scaling of Two-Phase Heat Transport SystemsSimilarity Considerations and Userful Equations Predictions versus Experimental Results

摘要

A review is presented on various aspects of thermal gravitational scaling ofspacecraft two-phase heat transport systems. Supporting similarity considerations, based on dimension analysis, and useful equations and correlations are given. The assessment of the applicability (validity and restrictions) of the NLR modeling and scaling approach is supported by a comparison of two-phase flow pressure drops measured under low-gravity conditions and modeling predictions. Terrestrial scaling experiments with the NLR ammonia test rig are identified for the support of the development of the ESA capillary-pumped two-phase ammonia experiment (TPX) in Get Away Special G-557 and the development of the mechanically-pumped ESA R114 Two-Phase Heat Transport System (TPHTS).