Detailed Numerical Model

Ventilation components with small geometric detail Numerical modeling of diffusers with complex geometry is difficult. Therefore, it is more reliable to measure airflow around such devices at full scale. 

Detailed numerical models for the photometric and chemical evolution of elliptical galaxies have been computed by Yoshii and Arimoto (1987), Matteucci and Tomambe (1987), Brocato et al. (1990) and Matteucci (1992,1994). These are terminal wind models similar in their basic assumptions to that of Larson (1974b), but with differing assumptions as to IMFs and scaling laws that specify how the... 

It is worth noting than adsorption process design is a mature science and there is seldom a need to employ detailed numerical models to solve the pdes described in Section 9.4. There are some spedahzed circumstances that may fall outside the norms for which many of the today s design tools have been formulated. Only in these circumstances is a more rigorous process simulation required for obtaining a design. 

We assume stationarity and radiative equilibrium for the energy balance because the radiative timescales are short in respect to the hydrodynamic timescales soon after the initial increase in luminosity. Spherical symmetry is assumed. According to detailed numerical models (Falk and Arnett, 1977 Muller, personal communication, 1987 Nompto, 1987 Nomoto et aL, 1987) and also analytical solutions for strong shock waves in spherical expanding enveloped (Sedov, 1959) density profiles are taken which are given by the self-similar expansion of an initial structure i.e. 

As a first stage, SimSim was used to clarify reservoir dynamics. Results were then used later to build the detailed numerical model. The investigation performed with SimSim revealed the following important facts ... 

The close neighborhood of the front region. As pointed out earlier, this region determines both surface properties (skin formation) and weld line formations. Hence, a detailed analysis of the front region is warranted. This region can be simulated either by approximate analytical or detailed numerical models. 

Fuhrmann, J., Gartner, K. (2003). A detailed numerical model for DMFC discretization and solution methods. Paper for "Computaional fuel cell dynamics II", Banff Int. Res. Center, USA. 

DETAILED NUMERICAL MODELLING OF ALKANE OXIDATION AND SPONTANEOUS IGNITION... 

The continuing increase in analytical capabilities has allowed the use of highly sophisticated non-linear constitutive laws to model materials in conjunction with very finely detailed numerical models. This has enabled validating results to be derived from alternative software, thus enhancing confidence in the appropriateness and correctness of the results. However, as all analytical techniques have limits of applicability, an appropriate validation phase of methods and software verification should be carried out by means of either an independent analysis or a test. 

The zero length column (ZLC) technique has become a common tool to measure mass transfer kinetics in microporous adsorbents. The partial loading experiment is a variant of the traditional ZLC method in which the adsorbent is not allowed to reach full equilibration with the gas phase. Even though this variant of the ZLC experiment was introduced over 10 years ago, it has been applied only by few researchers. In this contribution we review the basic theory of the partial loading experiment and show that it can be used to establish the contributions of different mass transfer mechanisms. A detailed numerical model that includes the effects of nonlinearity of the isotherm and combined diffusion and surface barrier effects is presented to allow the correlation of complex sorbate-sorbent systems. 

The alternative to the hierarchical modeling is known as concurrent modeling and consists of combining different numerical models that simultaneously describe different sub-domains. Each numerical model runs in its sub-domain and exchanges information with its parent/child sub-domain at defined boundaries. The critical issue here is to define the criteria and protocols in order to automate the application of more detailed numerical models in a simulation domain in time and realizing the so-called temporal multi-scale calculations or/ and space referred as spatial multi-scale ones. 

Use detailed numerical models and chemical schemes to investigate the combustion stabihty and hetero-Zhomogeneous chemistry coupling in methane- and propane-fueled catalytic, channel-flow microreactors while accounting for all relevant heat transfer mechanisms, for both transient and steady-state reactor conditions. 

The experimental investigation of microscale devices is hindered by many technical limitations, permitting only the acquisition of a rather narrow range of experimental data, unsuitable for an in-depth analysis of the aforementioned devices operational characteristics. In view of the absence of such sets of experimental data for catalytic microreactors/microcombustors, detailed numerical models prove to be invaluable in providing insight on the particular physics of hetero-Zhomogeneous combustion processes in the microscale. 

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