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Run-Tong Zhang, Seminar, 9:00 AM, Mar. 5, 2014

Published: March 3, 2014


Measurement of Effective Diffusivity: Chromatographic Method (Pellets & Monoliths)

Research Interests / Research Profile:

Experimental measurements were performed to determine the effective diffusivity of a binary pair of non-reacting gases (He in N2, and N2 in He) in spherical γ-alumina pellets (1 mm diameter), and in γ-alumina washcoated monoliths (washcoat thickness 20 to 60 µm, on 400 cpsi (cells per square inch) cordierite support). The method used is based on the chromatographic technique, where a gas flows through a tube, which is packed with the sample to be tested. A pulse of tracer gas is injected (e.g. using sample loops: 0.1, 0.25, 0.5 ml) and by using an on-line mass spectrometer the response in the outlet of the packed bed is monitored over time. The obtained tortuosity factor are used in a SPSC model built in CFD package – COMSOL multi-physics 4.3a to back calculate effective diffusivity. Beside, numerical method i.e. convolution theorem is applied to evaluate effective diffusivity from the response of a column without extra-column effects.

Personal Profile:

Doctor of Philosophy, Chemical Engineering, University of Bath, Bath, 2009-2013

Thesis title: Measurement of Effective diffusivity: Chromatographic method (Pellets and Monoliths); supervised by Professor Stan T Kolaczkowski.

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