There are a number of systems in which supercritical cryogenic fluids are used as coolants or propellant fluids. In some modern military aircraft, the fuel is pressurized above its critical point and used as a coolant to remove heat from the aircraft engine. Accurate prediction of heat transfer coefficients to turbulent flows of supercritical fluids is essential in design of such systems. One o...

There are many difficulties in the purification of raw components and products. However, researchers are seeking better ways for purification. One of the recent methods is extraction using supercritical fluids. In this study, the phase equilibria of benzoic acid -supercritical carbon dioxide system were investigated. Regarding the phase equilibria of this system, the modeling of solid-supercrit...

Soil was treated with "C-ring-labeled fluometuron [N,N-dimethyl-N'[3-(trifluoromethyl)phenyll urea] (0.516 and 5.16 pmol gl), air-dried, and stored for 6 months at 5 "C. The 14C was then extracted from soil with methanol by conventional extraction (twice with MeOH/H20 8020 v/v; 2:l extract/soil v/w) and with CO2 using a supercritical fluid extractor. Supercritical fluid extraction (SFE) method ...

The kinematic viscosity is a major physical property to be used in numerical, experimental and analytical work in all the related fields of fluid flow research. Its determination can be based on experiments with viscometer and on calculations for single or multi-species components, possibly through the use of mixture law and other intermediate parameters. Its experimental estimation for multi-s...

Numerical studies have been carried out to investigate flow instabilities in a natural circulation loop with supercritical CO2. For steady-state and dynamic analyses of the loop under supercritical conditions, a single-channel, one-dimensional model is developed. In this model, equations for the conservation of mass, momentum and energy are discretized using an implicit finite difference scheme...

A sodium pump inhibitor (digitalis-like factor), isolated from the peritoneal dialysate of volume-expanded, hypertensive patients with kidney failure who were treated with this dialysis modality, was further purified and characterized by means of supercritical fluid chromatography, a separation technique whose application to very-low-concentration biomolecules is new. Previous studies suggested...

Supercritical CO2 extraction technology uses supercritical fluid as extractant to extract and separate effective components from plants liquid or solid. At present, is widely used in fluid, with a critical temperature of 31.265 °C pressure 7.18 MPa. The conditions are easy reach. In state, the density very sensitive changes pressure, separation technologies can be divided into two types: membra...

BACKGROUND In this study, the fermentation of ginseng seeds was hypothesized to produce useful physiologically-active substances, similar to that observed for fermented ginseng root. Ginseng seed was fermented using Bacillus, Pediococcus, and Lactobacillus strains to extract ginseng seed oil, and the extraction yield, color, and quantity of phenolic compounds, fatty acids, and phytosterol were ...

Cochran, H.D., Cummings, P.T. and Karaborni, S., 1992. Solvation in supercritical water. Fluid Phase Equilibria, 71: 1-16. The aim of this work is to determine the solvation structure in supercritical water compared with that in ambient water and in simple supercritical solvents. Molecular dynamics studies have been undertaken of systems that model ionic sodium and chloride, atomic argon, and m...