Liquid droplets of water and argon surrounded by their vapor have been simulated by the molecular dynamics method. To explore the surface phenomena of clusters, each molecule is classified into 'liquid', 'surface', or 'vapor' with respect to the number of neighbor molecules. The contribution of a 'surface' molecule of the water cluster to the far infrared spectrum is almost the same as that of ...

Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, postdepositional processes linked with snow metamorphism remain poorly documented. For this purpose, monitoring of the isotopic composition (δ18O, δD) of near-surface water vapor, pre...

In an open-air setting, one source of fluctuations in a T-ray (THz) pulsed signal is attributed to water vapor. Fluctuations of this type are generally undesired, and so the water vapor is commonly removed in a closed chamber. Yet, in some applications a closed chamber is not feasible. This paper presents a preliminary study on a computational means to address the problem. Initially, the comple...

The measured dynamic surface tension of a water drop in air saturated by heptane vapor shows a sharp decrease from about 60 mN m−1 to 40 mN m−1, and less after a certain adsorption time. The observed adsorption kinetics is analyzed by a theoretical model based on multilayer adsorption of alkanes from the vapor phase at the water surface. The model assumes a dependence of the kinetic coefficient...

Title of dissertation: THE EFFECT OF SURFACTANT VAPOR ON MARANGONI CONVECTION IN ABSORPTION AND CONDENSATION Zhe Yuan, Doctor of Philosophy, 2005 Dissertation directed by: Dr. Keith E. Herold, Associate Professor, Department of Mechanical Engineering Mass and heat transfer enhancement by the addition of a class of surfactant additives is in common use in absorption machines based on aqueous lit...

[1] Tropical convective anvil clouds detrain preferentially near 200 hPa. It is argued here that this occurs because clear-sky radiative cooling decreases rapidly near 200 hPa. This rapid decline of clear-sky longwave cooling occurs because radiative emission from water vapor becomes inefficient above 200 hPa. The emission from water vapor becomes less important than the emission from CO2 becau...

This paper deals with the study of calcium sulfoaluminate (CSA) and geopolymeric (GEO) binders as alternatives to ordinary Portland cement (OPC) for the production of more environmentally-friendly construction materials. For this reason, three types of mortar with the same mechanical strength class (R3 ≥ 25 MPa, according to EN 1504-3) were tested and compared; they were based on CSA cement, an...

Acrylic resins are well known for their properties of surface aggregation and protection of natural and artificial degraded stones. Promising results in term of water repellency and water vapour permeability have been obtained by in situ polymerizing a series of products based on acrylic monomers. It is well known that the introduction of fluorine atoms into polymer structures has the effect of...

Modification of soy protein film properties by heat-curing was studied. Glycerin-plasticized films were cast from alkaline aqueous solutions of soy protein isolate. Films were heated at 80 or 95°C for 2, 6, 14, or 24 h. Tensile strength (TS), elongation at break (E), moisture content (MC), water solubility (WS), water vapor permeability (WVP), and color of heated and control films were measured...

This paper shows that the theory describing gas diffusion with no consideration of total pressure leads to an underestimation water vapor diffusive permeability. experimental method, called cup can be considered as one most popular tests in domain heat and mass transfer for building applications. Thus, it is likely permeability defined current materials underestimated. Thanks approach proposed ...