The Effect of Circulating Glass Beads on Crystallization Fouling and Fouling Resistance in Double-Pipe Heat Exchanger
DOI:
https://doi.org/10.14741/Keywords:
Crystallization fouling, Heat Exchanger, Heat transfer coefficient, Fouling Resistance, Glass bead.Abstract
Crystallization fouling experiments were performed for double pipe heat exchanger under counter flow condition in
which sodium sulfate (Na2SO4) at saturation condition and constant bulk temperature of (40°C) were made to flow in
the shell at different Reynolds number (Reh = 5000 - 12000), cold water flowing in the pipe at constant temperature
of (12°C) at different Reynolds numbers (Rec = 11000 - 37000).The overall heat transfer coefficient and fouling
resistance were determined from the measurement of the inlet and outlet temperature of the system at the given
different velocities. Glass beads (3mm∅) at two different concentrations (1.25 - 0.625 g/l) were introduced to the salt
solution to minimize the effect of fouling. The experimental results showed that the circulation of glass beads in the
heat exchanger annulus results in higher heat transfer rates than the case where no fouling is present. The enhancing
effect of glass beads on heat transfer is more pronounced at lower velocities and lower concentration. Fouling curves
for glass beads circulation at both concentrations show a drop in the values of fouling resistance due to the
continuous removal of the crystalline layer by the glass beads.
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