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Statistical variation of characteristics of random packed beds of Raschig rings:The influence of the sample size

Particuology 2021年第3期19卷 50-61页

作者： PawełNiegodajew Maciej Marek Czestochowa University of Technology Department of Thermal Machineryal.Armii Krajowej 2142-200 CzestochowaPoland

Many studies on random packed beds have been dedicated to local porosity(void fraction)or orientation distribution of ***,despite the random nature of the considered packings,very little attention has been devoted to examination whether the number of particles used in experiments/simulations is sufficiently large to get reproducible *** reproducibility of the key packing parameters depends on the size of the population of particles(sample size)and ordering effects induced by the confining *** work investigates quantitatively the influence of the sample size on the statistical variation of the packed bed *** beds of Raschig rings were generated with a sequential algorithm and three column diameters were *** has been found that in the case of the orientation distribution the results depend strongly on the sample size,especially for slender columns,while the porosity profiles are well-reproducible characteristics even for relatively small packings of *** complementary results for full cylinders are also included.

关键词： Random packing Raschig rings Full cylinders particle orientation Porosity Reproducibility

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The Versatile Method to Control the orientation of BN particles in Thermoset Matrix

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Journal of Chemistry and Chemical Engineering 2012年第9期6卷 769-773页

作者： Karnthidapom Wattanakul Sittisak Satasit College of Industrial Technology King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand

A new thermally conductive thermoset composite has been developed. A hybrid organic-inorganic material composed of an epoxy resin crosslinked with a flexible diamine hardener, and a BN, was prepared by incorporating epoxy structure units covalently into a BN via the sol-gel approach. The precursor was obtained by the reaction of DGEBA （diglycidyl ether of bisphenol A） with TEOS （tetraethyl orthosilicate）. The precursor was then hydrolyzed and co-condensated with tetraethyl orthosilicate which is covalently bond with the hydroxyl groups on the BN surface at room temperature to yield epoxy-BN hybrid sol-gel material. FTIR spectroscopy confirmed the formation of organic and inorganic network. The thermal conductivity as measured by thermal conductive analyzer showed an increase up to 0.4048 W/m.K, for a mixture containing 0.4 wt% of BN fillers in the epoxy matrix. Moreover, the optimum conditions for surface modification of BN particle were also investigated.

关键词： BN filled-epoxy composite particle orientation chemical modification of epoxy sol-gel method inorganic-organichybrid.

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