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Proceedings of an International Conference on Mitigation of Heat Exchanger Fouling and Its Economic and Environmental Implications

ISSN:
1-56700-172-6 (Print)

EFFECT OF FLOW RATE ON THE ENHANCEMENT OF PARTICULATE FOULING IN THE PRESENCE OF A DEVELOPING BIOFILM

G.R. Burton
Atomic Energy of Canada Limited Chalk River, Ontario, Canada KOJ 1 JO

M.E. Blimkie
Atomic Energy of Canada Limited Chalk River, Ontario, Canada KOJ 1 JO

G.B. McGarvey
Atomic Energy of Canada Limited Chalk River, Ontario, Canada KOJ 1 JO

C. W. Turner
Atomic Energy of Canada Limited Chalk River, Ontario, Canada KOJ 1 JO

Abstract

The rate of magnetite deposition on a heated test section has been investigated using radiotracing methods as a function of flow rate in the absence and presence of a growing biofilm of Pseudomonas fluorescens. The flow rate was adjusted to span Reynolds numbers from 2200 to 9600. For all flow rates there was an increase in the rate of magnetite deposition in the presence of the growing biofilm. In addition, the rate of deposition was an order of magnitude greater for a Reynolds number of 6400 than was observed at lower and higher flow rates with Reynolds numbers of 2200 and 9600, respectively. The results are discussed in relation to the shear stress on the biofilm and to the rate of transport of nutrients.