This book investigates the unique hydrodynamics and heat transfer problems that are encountered in the vicinity of the critical point of fluids. Emphasis is given on weightlessness conditions, gravity effects and thermovibrational phenomena. Near their critical point, fluids indeed obey universal behavior and become very compressible and expandable. Their comportment, when gravity effects are suppressed, becomes quite unusual.

The problems that are treated in this book are of interest to students and researchers interested in the original behavior of near-critical fluids as well as to engineers that have to manage supercritical fluids. A special chapter is dedicated to the present knowledge of critical point phenomena. Specific data for many fluids are provided, ranging from cryogenics (hydrogen) to high temperature (water). Basic information in statistical mechanics, mathematics and measurement techniques is also included. The basic concepts of fluid mechanics are given for the non-specialists to be able to read the parts he is interested in. Asymptotic theory of heat transfer by thermoacoustic processes is provided with enough details for PhD students or researchers and engineers to begin in the field. Key spaces are described in details, with many comparisons between theory and experiments to illustrate the topics.

Addresses problems that engineers have to face with the management of supercritical fluids under space conditions of weightlessness Additional basic information is provided on statistical mechanics, fluid mechanics and measurement techniques adapted to space conditions Investigates the unique hydrodynamics and heat transfer problems that are encountered in the vicinity of the critical point of fluids Includes supplementary material: sn.pub/extras

Inhalt

Preface.- 1 General Introduction to Near-Critical and Supercritical Fluids.- I Thermomechanical Effects.- 1 Bridging Gas and Near-Critical Fluid Dynamics.- 2 Bridging Gas and Near-Critical Fluid Dynamics.- 3 Temperature and Density Equilibration.- 4 Heat Transfer.- II Heat Transfer Experiments Performed in Weightless Conditions.- 5 Quick Overview of Some Test Cells.- 6 The Pancake Test Cell.- 7 Heat Transport by the Piston Effect: Experiments.- 8 Coexisting LiquidVapor Phases.- III Effects of a Steady-State Acceleration Field.- 9 **Interaction Between the Piston Effect and Gravitational Convection.- 10 RayleighB´enard and RayleighTaylor Instabilities.- 11 Experiments in a weak acceleration field and on Earth.- IV Influence of Time-Dependent Acceleration Fields.- 12 **Response to Low-Frequency Vibrations: Solid-Like Behavior.- 13 Thermovibrational Effect.- V Appendices.