Computational Methods in Multiphase Flow VII by C. A. Brebbia, P. Vorobieff

By C. A. Brebbia, P. Vorobieff

Multiphase flows are present in all parts of expertise, in any respect size scales and movement regimes and will contain compressible or incompressible linear or nonlinear, fluids. even if, even supposing they're ubiquitous, multiphase flows stay probably the most hard parts of computational mechanics, with a number of difficulties as but unsolved. complex computational and experimental tools are usually required to resolve the equations that describe such advanced difficulties. the various demanding situations that has to be confronted in fixing them comprise modeling nonlinear fluids, modeling and monitoring interfaces, facing a number of size scales, characterizing part constructions, and treating drop break-up and coalescence. it is very important validate versions, which demands using dear and hard experimental ideas. This e-book offers contributions at the newest examine within the thoughts for fixing multiphase circulate difficulties, awarded on the 7th in a biennial sequence of meetings at the topic that begun in 2001. Featured themes comprise: move in porous media; Turbulent circulation; Multiphase movement simulation; photo processing; warmth move; Atomization; Interface behaviour; Oil and gasoline functions; Experimental measurements; strength purposes; organic flows; Micro and macro fluids; Compressible flows.

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Considering the presence of considerably high changes in the Reynolds number inside the nozzle, a two equation SST turbulence model is used. 44. Further details on the mathematical description of these parameters could found in the software documentation [12]. First of all a steady state simulation is performed. However, this run could not be considered to predict the waving of the water sheet which is intrinsically unsteady structure. This run is used only to solve the inner flow of the nozzle and a stable part of the water sheet discharged into the air.

Time, growth rate and amplitudes are related by the following: ???? (2) � ???????? (????, ℎ)???????? = ln(???????? /????0 ) 0 where the quantity ln(???????? /????0 ) is set to be 12, based on the work of Dombrowski and Jones [13] and Dombrowski and Hooper [14]. The procedure proposed by Senecal et al. [9] is to maximize eqn (1) as a function of the wave number to obtain the highest growth rate Ω assuming constant half thickness of the water sheet. The critical time is computed using eqn (2). In the present case thickness is not constant.

The computational domain was obtained by considering the entire measuring section of the experimental test rig (1 meter) and the pipes before and after this section up to the experimental pressure ports (approximately 1 meter on each side). This avoided placing the inlet and outlet boundaries too close to the measuring section and at the same time allowed using experimental conditions in the numerical model. Figure 5: Euler-Lagrange computational domain. Structured grid is used for the whole domain.

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