![]() ![]() ParÃmetros globais e especÃficos, respectivamente, em funÃÃo da temperatura e concentraÃÃo de sÃlidos solÃveis totais (SST), foram mantidos nos modelos. Nesse trabalho, dados experimentais da literatura para onze sucos clarificados de frutas (manga, cereja, maÃÃ, pÃssego, groselha, romÃ, pÃra, limÃo, tangerina, limÃo-galego e uva) em concentraÃÃes e temperaturas de 15,0 a 74,0 ÂBrix, e 278,15 a 393,15 K, respectivamente, foram modelados utilizando correlaÃÃes empÃricas e semi-empÃricas oriundas da literatura. Por esse motivo, o conhecimento dos efeitos combinados desses dois parÃmetros na viscosidade à essencial para a indÃstria de sucos. Durante o processamento industrial dos sucos de frutas, a matÃria-prima à submetida à variaÃÃes de temperaturas e concentraÃÃes de sÃlidos que alteram sua viscosidade. A viscosidade à uma das propriedades reolÃgicas usada em diversas aplicaÃÃes, tais como: parÃmetro para o cÃlculo de coeficientes de transferÃncia de calor e massa dimensionamento de equipamentos avaliaÃÃo de custos projetos de processos controle de qualidade do produto alÃm de possibilitar a compreensÃo da estrutura quÃmica das matÃrias-primas. No entanto, para alcanÃar maior eficiÃncia e rendimento, torna-se necessÃrio o conhecimento do comportamento reolÃgico das matÃrias-primas. Segundo a AssociaÃÃo Brasileira das IndÃstrias de Refrigerantes, em 2012, a produÃÃo anual foi de 987 milhÃes de litros de sucos de frutas no Brasil. O consumo de sucos de frutas tem crescido, devido a comodidade e praticidade gerada pelos produtos prontos. However, considering the involved scales it seems suitable for modelling protoplanetary disks.ĬoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior alpha-viscosity cannot account for the evolution of the whole mass spectrum of super-massive black holes (SMBH) in AGN. Combined with the temporal decline of the accretion rate and its low amount, the model prohibits the growth of large central masses. Positive accretion rates throughout the disk demand a high degree of self-gravitation. In the Keplerian part of the disk our model is consistent with standard stationary alpha-disk theory, and self-consistent throughout the self-gravitating regime. We find a self-similar solution for the dynamical evolution of self-gravitating alpha-disks and derive the significant quantities. We use a self-similar approach to simplify the partial di ff erential equations arising from the evolution equation, which are then solved using numerical standard procedures. We investigate the suitability of alpha-viscosity in self-similar models for self-gravitating disks with a focus on active galactic nuclei (AGN) disks. Riemann solver should be used together with a reconstruction scheme of third or higherĪims. Presence of shocks (such as in the case of the Richtmyer-Meshkov instability), the HLLC Models have been initialized using the method proposed here). Rayleigh-Taylor problem (provided that grid convergence has been achieved and the turbulence ![]() Schemes do not have an important influence on the results in the case of the classical Of the numerical schemes on the results is investigated. The transport equations of the turbulence models are solved numerically and the influence ![]() The evolution of the mixing and of the total kinetic energy in the mixing zones. The last problem involves the mixing induced at two planar interfacesīy multiple shock reflections and refractions. The self similar growth of the Rayleigh-Taylor and Richtmyer-Meshkov instabilitiesĪnd can predict accurately the spatial distribution of the fluid concentrations and of the It is found that both turbulence models describe successfully A new approach for initializing the turbulence models in proposedįor the Rayleigh-Taylor problem. First, the classical Rayleigh-Taylor and Richtmyer-Meshkov Three test problems are considered and the performance of the turbulence models is assessedīy comparing their solutions with the results obtained by high resolution Implicit Models in order to prevent non-physical solutions when strong gradients are present in the Additional constraints are imposed to the Heavy/light and light/heavy configurations. In order to accurately capture the evolution of the Richtmyer-Meshkov instability in both Of the turbulence kinetic energy source present in the K - ϵ model is modified Is introduced for differentiating between the two types of instabilities. ![]() A new criterion based on ratio of the averaged flow and turbulence time scales The models containĪdditional source terms for the turbulence kinetic energy which depend on the type of the The K - L and K - ϵ turbulence models are used to simulate the turbulent mixing inducedīy the Rayleigh-Taylor and Richtmyer-Meshkov instabilities. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |