The University of California in collaboration with West Biofuels, LCC, has developed an advanced thermochemical gasification system (5 ton/day) for the conversion of waste stream biomass for the production of bio-fuels and bio-energy. The “Pyrox” gasifier design is based on a dual-fluidized bed system operating at atmospheric pressure with air. Simulation of this gasifier was conducted with a n...

A new contactless pneumatic microfeeder based on distributed manipulation is proposed. By cooperation of dynamically programmable microactuators, the part to be conveyed floats over an air cushion and is moved to the desired location with the desired orientation. CFD simulations are used to test the validity of the proposed concept and refine the design of the microactuators.

CFD (Computational Fluid Dynamics) simulations appear to be strong competitor of the wind tunnel test which required scaled model and it is really expensive and time consuming tool in designing bridges therefore there is a strong claim to replace them with CFD. Analyses carried out for different deck cross sections by secondary development of commercial computational fluid dynamics software ANS...

OBJECTIVES/HYPOTHESIS Obstructive sleep apnea (OSA) is a sleep disorder caused by partial or complete collapse of the pharyngeal airway. Genioglossal advancement (GGA) is a well-tolerated surgical procedure intended to address hypopharyngeal collapse, yet there are few studies that monitor changes in airflow dynamics at this site. Computation fluid dynamics (CFD) utilizes airflow simulation to ...

A membrane reactor is a reaction system that provides higher productivity and lower separation cost in chemical reaction processes. In this paper, packed bed catalytic membrane reactor with palladium membrane for methane steam reforming was analyzed both experimentally and numerically. The numerical model consists of a full set of partial differential equations derived from conservation of mass...

The analysis of urban morphology and its impact on ventilation is a critical task in urban planning. Accurate urban-scale computational fluid dynamics models (CFD) are sometimes too expensive for rough estimations. Effective and convenient computer tools that could depict the pattern of the urban roughness are in great need. This paper presents a simulation approach which is grounded in the age...

An electrochemical membrane bioreactor (EMBR) has recently been developed for energy recovery and wastewater treatment. The hydrodynamics of the EMBR would significantly affect the mass transfers and reaction kinetics, exerting a pronounced effect on reactor performance. However, only scarce information is available to date. In this study, the hydrodynamic characteristics of the EMBR were inves...

Natural ventilation is crucial for conserving the energy, reducing carbon emission, and improving the comfort level of the built environment and the indoor air quality. The Computational Fluid Dynamics (CFD for short) represents the combination of the modern fluid dynamics, numerical mathematics and computer science. By employing CFD wind environment simulation technology, the architects are ab...

Numerically challenging, comprehensive benchmark cases are of great importance for researchers in the field of CFD. Numerical benchmark cases offer researchers frameworks to quantitatively explore limits of the computational tools and to validate them. Therefore, we focus on simulation of numerically challenging benchmark tests, laminar and transient 3D flows around a cylinder, and aim to estab...

This paper deals with pump as turbine (PAT) as a feasible solution to the energy problems in rural and hilly areas. PAT provides an economical alternative to actual turbines especially for pico and microhydropower generation. PAT is essentially a pump operating in turbine mode by changing direction of flow and hence the direction of rotation of the impeller. In the forthcoming discussion, an in...