(29f) Prediction Of The Minimum Bubbling Point

We present the extension of the model of Brandani and Zhang (2006) to include the effect of voidage on the characteristic dimension. The constitutive equation for this model parameter is obtained through a series of well characterised bed collapse experiments (Cherntongchai and Brandani, 2005).

The equations needed to calculate the minimum bubbling point are obtained through a linear stability analysis. We compare the predictions to over 700 literature data points and discuss in detail the influence of pressure, temperature and the nature of the particles.

From this comprehensive comparison, it is also possible to establish that there is an upper maximum in the value that the minimum bubbling point of any fluid particle system can reach. We discuss how to formulate the problem of predicting this maximum and map this value as a function of the Archimedes number and density ratio for our model.

Brandani S. and Zhang K. Powder Technology, 2006, 163, 80-87.

Cherntongchai P. and Brandani S., Powder Technology, 2005, 151, 37-43.