Thermal heating during microwave processing for cerium oxide particles packing: Multiphysics modelling approach. Study of the effect of particle and neck sizes

This chapter provides an insight into the reactive transport in a capillary column which heavy-oil hydrocarbons undergo when analysed by high temperature gas chromatography (HTGC), and their implications on characterisation outcomes, namely thermal cracking of the injected sample; and incomplete or non-elution of heavy components from the column, by using a coupled Thermo-Hydro-Chemical (THC) multiphysics modelling approach. For this purpose, a computational coupled THC, multicomponent, multi-physics model is developed, accounting for: multiphase equilibrium using an in-house, extended thermodynamics distribution factors dataset, up to nC98H198; transport and fluid flow in COMSOL and MATLAB; and chemical reactions using kinetics and mechanisms of the thermal cracking, in CHEMKIN. The determination of the former extended dataset is presented using two complementary HTGC modes: i) High-Efficiency mode, with a long column operated at low flow rate; and ii) true SimDist mode, with a short column operated at high flow rate and elution up to nC100H202.

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Reduction of Oxygen Free Radical Production by Micro and Nano Sized Cerium Oxide Particles: A Novel High School Chemistry Lab Demonstrating a Size Effect

Journal of Nano Education ◽

10.1166/jne.2016.1086 ◽

2016 ◽

Vol 8 (1) ◽

pp. 63-70

Author(s):

Nicholas Eliason ◽

Soumen Das ◽

Sudipta Seal

Keyword(s):

High School ◽

Free Radical ◽

Size Effect ◽

Cerium Oxide ◽

Oxygen Free Radical ◽

High School Chemistry ◽

Free Radical Production ◽

Radical Production ◽

Oxide Particles

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Multiphysics analysis for the determination of valvetrain characteristics

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/095440705x34801 ◽

2005 ◽

Vol 219 (9) ◽

pp. 1109-1117 ◽

Cited By ~ 6

Author(s):

M Teodorescu ◽

V Votsios ◽

H Rahnejat

Keyword(s):

Combustion Process ◽

Linear Dynamics ◽

Non Linear ◽

Multiphysics Modelling ◽

Opening And Closing ◽

Exhaust Valves ◽

Modelling Approach ◽

The Ideal

The ideal function of a valvetrain system is to synchronize the opening and closing of the inlet and exhaust valves with the required thermodynamics of the combustion process. As such, ideally a kinematic-type mechanism is desired. However, the timing requirements in the action of each valve and between any inlet-exhaust pair necessitate the use of contacting pairs of suitable profiles. The very existence of contact renders the problem one of complex non-linear dynamics, which is further exacerbated by the translational imbalance of the reciprocating compliant elements such as the valve itself. The interplay between these various forms of dynamics, inertial, structural, and impact/contact, make the problem quite complex to analyse. As a result, some of the most important problems with valvetrains are only surmised at, rather than fundamentally understood. The multiphysics modelling approach proposed in this paper renders a better understanding, as well as conforming to experimental observations.

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