Abstract
The near-critical fluid has become a hot topic in recent years. This chapter reviewed and summarized the recent developments in near-critical fluid flow and hat transfer studies. Currently only several research groups are focused on the thermal-physical details. While there are a lot many application proposals for near-critical fluids, there are a lot many unknowns in the fundamental aspects. The main results on heat transfer correlations and pressure losses, however a lot many discrepancies still exist and it is largely dependent on specific system designs, especially for microscale systems. The analysis of mechanisms is lacked for near-critical region. More importantly, the nature of Piston Effect and thermal mechanical process in the near-critical region is still not well explained. Multi- spatial scales and multi- time scales analysis will be necessary for better understanding of the near-critical dynamics.
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