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Über dieses Buch

This book discusses basic thermodynamic behaviors and 'abnormal' properties from a thermo-physical perspective, and explores basic heat transfer and flow properties, the latest findings on their physical aspects and indications, chemical engineering properties, microscale phenomena, as well as transient behaviors in fast and critical environments. It also presents the most and challenging problems and the outlook for applications and innovations of supercritical fluids.



Chapter 1. Challenges in Near-Critical Microchannel Flows

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.
Lin Chen

Chapter 2. Design and Realization of Near-Critical Visualization Experiment

Phase-shifting interferometry is one sub-category of holographic optical measurement methods. Generally, the interferometer system is utilized for the quantitative measurement of density field of a fluid. As in heat transfer field, the density is usually correlated with temperature; therefore, the measurement of temperature field by interferometer system becomes possible.
Lin Chen

Chapter 3. Discussion on Near-Critical Heat Transfer Flow Experiment

The key point of the near-critical experiment is the realization of the visualization process, under unstable thermodynamic flows. The response of the near-critical fluid to thermal disturbances and the through-flow behaviors under near-critical effects would serve as the basic information for critical fluid flow inside microchannels.
Lin Chen

Chapter 4. Numerical Formulation of Near-Critical CO2 Flow in Microchannels

To further explore the critical thermal convective flow, numerical simulations of basic microchannel models with CO2 flow near its critical point are reported in this chapter.
Lin Chen

Chapter 5. Heat Transfer Characteristics of Near-Critical Microchannel Flows

In near-critical fluid, the unique feature is the coupling of convection dynamics and the heat transfer process (Zappoli et al. Heat transfer and related effects in supercritical fluids. Springer, London, 2015 [1]; Amiroudine and Zappoli Piston effect induced thermal oscillations at the Rayleigh-Benard threshold in supercritical 3He 90:105303, 2003 [2]; Carles A brief review of the thermophysical properties of supercritical fluids 53:2–11, 2010 [3], Chen et al. Numerical simulation of near-critical fluid convective flow mixing in microchannels 97:67–80, 2013 [4]). It is very special for the findings of convective structure and heat transfer enhancement in novel near-critical systems.
Lin Chen

Chapter 6. Theoretical Analysis of Near-Critical Stability Behaviors

This chapter is focused on the theoretical analysis of near-critical stability behaviors under the current model settings. The extension from phenomenological study to theoretical development is very important for in-depth understanding of the near-critical physics. The stability evolution of the current through flow microchannels is different from traditional turbulent transition or stability channels, where the major transition is based on Reynolds number description.
Lin Chen

Chapter 7. Summary and Outlook

After detailed high pressure interferometer visualization experiment, numerical modeling and theoretical analysis, the following main points are summarized for the current study.
Lin Chen


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