Abstract: This paper presents results on performance limitations for direct fired coal power plants. A specific feature of this system is the existence of a very large input delay between one of the inputs, namely coal flow, and the two outputs, load and vapour pressure. This problem motivates the main theoretical question addressed in this paper: To examine tracking performance limitations in ...

For fiber reinforced resin matrix composites, void is a common defect which can seriously deteriorate the properties of composite parts. Voids form and grow during composite fabrication, so the processing parameters must be carefully controlled to avoid this defect. In hot melt prepreg/autoclave process, hygroscopic water absorbed by prepreg is believed to be the main source of voids, especiall...

By means of electrochemical vapour deposition (E VD), it is possible to grow thin (0.5-j pm), dense airconia/yttria layers on porous ceramic substrates. Kinetics of the EVD process, morphology and oxygen permeation properties of the grown layers are investigated. Very thin (0,.5 t-an) layers are grown at relatively low temperatures (700 SOO’C). Water vapour as reactant enhances the surface reac...

Distillation is a physical process used to separate a fluid mixture of two (binary) or more (multicomponent) substances into its component parts. In most cases, the components to be separated are miscible liquids with different volatilities and boiling points. This separation process is a thermal unit operation that utilizes the differences of vapour pressure to produce the separa‐ tion. In thi...

A procedure for determining the structure of vapour and gas adsorbates that is based on the Zeta adsorption isotherm is reported. For vapours and for gases, this isotherm supposes that an adsorbate consists of particle clusters with the number of particles in a cluster denoted ζ, where ζ can be 1, 2, 3… up to a maximum of ζm, and predicts the isotherm constants are independent of pressure. For ...

This paper focuses on the modelling and simulation of unsteady sheet cavitation in marine propeller flows. In the first part of the paper, the mathematical model based on potential flow theory is introduced and the numerical scheme is derived. The novelty of the presented calculation method refers to the unsteady partial sheet cavitation model which has been implemented into the in-house panel ...

Reports indicate that weather conditions may affect some symptoms of rheumatoid arthritis (RA) but not the disease itself. Eighty-eight patients living in the marine climate of the Dutch coastal provinces scored their pain symptoms daily during a full year. Correlation analyses of monthly patient averaged pain scores against each of 6 weather factors indicated that RA pain associates positively...

Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small concentrations of protons may enhance the transport of oxygen in the form of hydroxide io...