By M. El-Amin
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Extra resources for Advanced Topics in Mass Transfer
Radial proﬁles of the velocity-concentration correlation for H2 − Air jet with different values of Froude number at several axial locations. νt to the eddy material diffusivity Dt . It is very well known from literature that the spreading rate of material in free jets is greater than that of momentum; thus, the turbulent Schmidt number is less than unity and has a signiﬁcant effect on the predictions of species spreading rate in jet ﬂows. 3 Fig. 14. Radial proﬁles of turbulent eddy viscosity and turbulent eddy diffusivity for H2 − Air with Fr = 268 (momentum-dominated) at several axial locations, compared with (El-Amin, 2009).
U0 and C0 are, respectively, the vertical velocity and concentration at the inlet. Q, F0 and Y are respectively, volume ﬂux, buoyancy ﬂux and mass ﬂux at the inlet. z0 is the virtual origin, that is, the distance above/below the oriﬁce where the ﬂow appears to originate. e. z0 = 0 , therefore, z − z0 in the above expressions will replaced by z. 2. Momentum-dominated regime The turbulent round jet is the most suitable model to describe unintended hydrogen releases with circular leak geometries, such as pinholes, through which the ﬂow of hydrogen is an axisymmetric jet.
2000). Diffusion coefficients of three organic solutes in aqueous sodium dodecyl sulfate solutions. J. Col. and Int. ; Bergveld, P. (2000). Micro total analysis systems 2000, Springer, ISBN 0792363876, Dordrecht Wilke, C. R. & Chang P. (1955). F. El-Amin and Shuyu Sun King Abdullah University of Science and Technology (KAUST), Thuwal Kingdom of Saudi Arabia 1. Introduction The low-density gas jet injected into a high-density ambient has particular interest in several industrial applications such as fuel leaks, engine exhaust, diffusion ﬂames, materials processing, as well as natural phenomena such ﬁres and volcanic eruptions.
Advanced Topics in Mass Transfer by M. El-Amin