0009-2614/$ see front matter 2010 Elsevier B.V. A doi:10.1016/j.cplett.2010.08.019 * Fax: +972 2 651 3742. E-mail address: [email protected] The residence time of a diffusing particle in a prescribed spatial region recently finds an increasing number of applications in physics and chemistry. A partial differential equation for the residence time moments is derived, as a generalization of the ...

a numerical model for simulating residence time distribution (rtd) of turbulent flows in helical static mixers is proposed and developed to improve the understanding of static mixers. the results of this model is presented in terms of different volumetric flow rate to illustrate the complicated flow patterns that drive the mixing process in helical static mixers. the computed results are also u...

spatial measurements of conductivity, temperature and depth were used to study salinity variations along the principal channels of the tidal hypersaline creek network in the vicinity of bushehr port, persian gulf during three 25- tidal cycles in both warm and cold months. salinity variations and tidal fluctuations were out of phase throughout the short inverse estuary. the salinity values insid...

The problems of the first-passage time (FPT) [1, 2] and the residence time (RT) [3] are very important issues in random walk theory. Moreover, several properties of diffusion and transport in disordered systems are based in this concepts. Here, we do not want to present a survey of the enormous literature in the field of mean firstpassage time (MFPT) and mean residence time (MRT) of random walk...

Residence time is a critical factor in determining the size of an open face biofilter. Four test biofilters were constructed with media comprised of yard waste compost and brush chips to compare 8 s. and 4 s. residence time. Biofilter performance was monitored for ten months by measuring pressure drop, moisture content, odor threshold, hydrogen sulfide, and ammonia concentrations. Odor reductio...

Variability of residence time in the Tropical Tropopause Layer during Northern Hemisphere winter K. Krüger, S. Tegtmeier, and M. Rex Leibniz-Institute for Marine Sciences at Kiel University (IFM-GEOMAR), Kiel, Germany Environment Canada, Toronto, Canada Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany Received: 18 April 2009 – Accepted: 15 May 2009 – Published: 28 May 20...