Abstract
Prandtl's mixing length theory is applied in a theoretical study of the frictional pressure drop of gas-solids suspension flows, with consideration given to the different modes of flow around a particle depending of the conditions of flow. The flow channel was divided into three regions—(a) the “F-region” of non-interacting flow, (b) the “E-region” of interacting flow around the particles, and (c) the “P-region” occupied by the particles. The particular phenomenon known as ‘drag reduction’ is also analyzed on the basis of the same theory. The principles used being based on the perturbation theory, the analysis does not agree with the experimental results in the range of high solids/gas mass loading ratio. For small loading ratios, as well as for suspensions not liable to agglomeration, the agreement obtained between theory and experiment was quite good.
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