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Duct-flow schematic 

The gauge's utility would be restricted if it required a stationary surrounding fluid. Work performed by Tuladhar et al., 2002, demonstrated how the gauge can be used under turbulent flow conditions in ducts and at elevated temperatures. This allows cleaning studies of fouling layers, e.g. whey protein, to be performed in the bulk flow regime, typical of cleaning-in-place conditions. A commercial heat flux sensor has also been incorporated into the cleaning rig to simultaneously monitor the deposit thickness and thermal resistance profile.