A numerical moving boundary model has been developed to examine transient heat transfer and vapor-liquid displacement in impulse drying. The model, MIPPS, uses implicit, finitedifference forms of the mass, momentum, and energy conservation equations adapted for porous media. Predictions of water displacement, heat flux, and vapor pressure generation appear to be reasonable in light of available...

The physical mechanisms of entropy generation in a condenser with high fractions of noncondensable gases are examined using control volume, scaling, and boundary layer techniques, with the aim of defining a criterion for minimum entropy generation rate that is useful in engineering analyses. This process is particularly relevant in humidification-dehumidification desalination systems, where min...

Astronomical arrays operating at (sub)millimeter wavelengths are seriously compromised by rapid variations in atmospheric water vapor that distort the phase coherence of incoming celestial signals. The signal received by each antenna of the array suffers a phase delay that varies rapidly with time and from antenna to antenna. Unless corrected, these distortions limit the coherence time of the a...

Control of aerosol and vapor characteristics that affect the toxicity of inhaled contaminants often determines the methods of generating exposure atmospheres. Generation methods for aerosols and vapors are presented. The characteristics of the resulting exposure atmosphere and the limitations of the various generation methods are discussed. Methods and instruments for measuring the airborne con...