Quasi-steady combustion of normal-alkane droplets supported by Cool-Flame chemistry near diffusive extinction

We have found that microbodies appeared profusely together with a remarkable increase in catalase activity in normal alkane-grown cells of hydrocarbon-utilizing Candida yeasts, and that the microbodies multiplied by division in these cells. These features of Candida yeasts seem to provide a useful model system for studies on the biogenesis of the microbody. Subsequently, we have succeeded in isolation of Candida microbodies in an apparently native state, as judged biochemically and morphologically. The presence of DNA in the purified microbody fraction thus obtained was proved by the diphenylamine method. DNA molecule of about 15 urn in contour length was released from an isolated microbody. The physicochemical analyses of the microbody DNA revealed that its buoyant density differed from nuclear and mitochondrial DNAs. All these results lead us to the possibility that there is a novel type of DNA in microbodies.

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CFD modelling of a “stabilized cool flame” reactor with reduced mechanisms and a direct integration approach

Chemical Engineering Science ◽

10.1016/j.ces.2007.09.016 ◽

2008 ◽

Vol 63 (2) ◽

pp. 424-433 ◽

Cited By ~ 10

Author(s):

D.I. Katsourinis ◽

M.A. Founti

Keyword(s):

Direct Integration ◽

Cfd Modelling ◽

Cool Flame ◽

Flame Reactor ◽

Integration Approach

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Effects of Tailpipe Friction on the Nonlinear Dynamics of a Thermal Pulse Combustor

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2771252 ◽

2008 ◽

Vol 130 (1) ◽

Cited By ~ 11

Author(s):

Achintya Mukhopadhyay ◽

Subhashis Datta ◽

Dipankar Sanyal

Keyword(s):

Time Series ◽

Friction Factor ◽

Time Series Data ◽

Threshold Value ◽

Series Data ◽

Combustion Dynamics ◽

Thermal Pulse ◽

Pulse Combustor ◽

Steady Combustion ◽

Peak Pressures

The effect of tailpipe friction on the combustion dynamics inside a thermal pulse combustor has been investigated using a nonlinear model consisting of four coupled first order ordinary differential equations. The dynamics of the system is represented through time series plots, time-delay phase plots, and Poincaré maps. The results indicate that as the tailpipe friction factor is lowered, the system undergoes a transition from steady combustion through oscillating combustion to an intermittent combustion with chaotic characteristics before extinction. The time series data are shown to be useful indicator for early detection of extinction. In one approach (thresholding), the occurrence of local peak pressures below a predefined threshold value is identified as an event and the number of events (event count) and largest number of successive cycles with such events (event duration) are recorded as the friction factor is lowered. In another approach, the statistical moments (kurtosis) of the data are used. Number of kurtosis peaks above a prescribed value and variance of the kurtosis values are recorded for decreasing values of friction factor. All these numbers sharply increase as the system approaches extinction.

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