β Scribed by Youchen Fan
No coin nor oath required. For personal study only.
The k-E model is a wid!ely used model in engineering practice in handling indoor air quality problem. However, difficulties may arise when using the high Reynolds number k-e model to simulate air flow patterns close to the boundaries of air and the stagnant component as well as the low air flow fluctuation elsewhere in a room. When using the k-E model for low Reynolds number cases, the correlations between turbulent coefficients and turbulent Reynolds number must also be defined. By using the so-called Kolmogorov micro scale method, a new set of turbulent coefficient functions was deduced in this paper for the k-e model in a case of low Reynolds number flow. Using the standard wall function leads to large differences between the measured and calculated heat transfer coefficient. A special wall function valid for a viscous sublayer, a buffer zone and a fully turbulent log-law zone is recommended in this paper. In addition, the modelling of air terminal devices in CFD simulations is summarized by using a literature collection.
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## Abstract In the present work two 3βD models, for the catalytic layer, were employed in order to simulate the responses of a PBI high temperature polymeric membrane fuel cell. The simulations made use of an agglomerate model and a pseudoβhomogenous model, both implemented taking into account the
unit is a proper size and should become the main fleet of the industry for next century. This paper discussed the types of supercritical technology the Chinese Utility Industry will seek, how they will obtain the technology, the economics, and the benefit for the environment. The indirect benefits f