By S. Hartwig (auth.), Sylvius Hartwig (eds.)
This booklet contains the court cases of the second one symposium on heavy gases and threat evaluate held in might 1982 on the Battelle-Institut e. V., Frankfurt am major. The symposium was once a se
Read Online or Download Heavy Gas and Risk Assessment — II: Proceedings of the Second Symposium on Heavy Gases and Risk Assessment, Frankfurt am Main, May 25–26, 1982 PDF
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Additional info for Heavy Gas and Risk Assessment — II: Proceedings of the Second Symposium on Heavy Gases and Risk Assessment, Frankfurt am Main, May 25–26, 1982
Sample text
Within the atmosphere itself energy fluxes appear between the different reservoirs. Theses fluxes are not very relevant to the problems which will be discussed below because of their short duration. Therefore these interactions have been omitted from fig. 1.
This model with changing model constants, has predicted transport for a wide range of sheer or recirculating turbulent flows. The model does display weaknesses, however, there is significant anisotropy of the turbulent flow. This can occur when there is a preferred direction to the flow, such as when gravity is important or there is significant streamline curvature. However, no simple model involving eddy viscosity is adequate for flows of this type. Only a higherorder modelling technique - stress-equation modelling, is applicable.
J 'OX and is due to interaction of turbulent stresses with horizontal mean veloci ty gradients. '__ and P tare due, again, to non-uniformities in the vertical distr~ution of flow 50 s. F. JAGGER variables. They are most important at the top and bottom of the layer and in many circumstances, especially for a dense gas, may be neglected. The adaptation of the k- E model to depth-averaged flows is certainly of a rather empirical nature, as evidence by choise of programme constants so far adopted for applications.