Silica scaling on the surface of a flat plate and a vertical cylinder has been investigated in a water tunnel, where fluid flow and silica colloid size
conditions can be controlled. Development of the test rig is described and some preliminary results are presented. Ultimately, the aim of this work is to characterise the link between fluid flow characteristics, silica colloid particle size and the scaling process, and to thereby understand the
fundamental processes involved in silica scaling in geothermal systems.

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