Fluid Dynamic Gauging for Studying Early Stages of Swelling of Fouling Deposits

A new variant of the fluid dynamic gauging technique for determining the thickness of soft fouling layers in situ and in real time is reported. The sideways fluid dynamic gauging (SiDG) device allows measurements to be made shortly after a deposit layer contacts a solution, allowing processes such as swelling to be characterized accurately. Two applications of the device are reported: (i) in cleaning, monitoring the change of thickness of a complex food soil when it is contacted with aqueous solutions at different temperatures, pH and surfactant content, and (ii) in fouling, in determining the thickness, thermal conductivity and strength of deposits generated from whey protein solutions on heated stainless steel substrates. The evolution of fouling resistance for the whey protein deposits indicates that significant aging takes place during the fouling test, which is confirmed by changes in the thermal properties and strength of the deposit layer as measured by the SiDG device.

Automated summary

A new variant of the fluid dynamic gauging technique has been reported for determining the thickness of soft fouling layers in real time, allowing accurate characterization of processes like swelling shortly after a deposit layer contacts a solution. Two applications of the SiDG device have been reported, showing its effectiveness in monitoring thickness change of food soil in cleaning processes and determining properties of deposits on stainless steel substrates in fouling situations. Ageing of fouling resistance and changes in thermal properties and strength of deposit layers during fouling tests have been confirmed by the SiDG device.