Somerscales in addition to Knudsen (1981) convey identified vi categories off fouling:
- Particulate fouling. The accumulation ofsolid particles is suspended inwards the procedure flow on the estrus transfer surfaces. Typical examples include dust deposition, particles carried inwards condenser cooling water, in addition to unburned fuel, or wing ash. If the venture deposition is due to gravity, the procedure is referred to equally sedimentation fouling.
- Precipitation fouling. Dissolved substances carried inwards the procedure flow are precipitated on the estrus transfer surfaces. Examples include carbonates, sulfates, in addition to carbonates. Scaling occurs when atmospheric precipitation occurs on heated rather than cooled surfaces.
- Chemical reaction fouling. In for certain cases, deposits on the estrus transfer surfaces which are not, inwards themselves, reactants are formed past times chemic reactions. In this type off ouling, slap-up in addition to coking ofhydrocarbons in addition to polymerization are typical examples.
- Corrosion fouling. In this type of fouling, the estrus transfer surface reacts, at for certain pH levels, to gain products that adhere to the estrus transfer surfaces, in addition to inwards turn, this may promote the attachment of additional fouling materials. Sulfur inwards fuel fossil oil in addition to sulfur products inwards the flue gas, such equally sulfur dioxide, tin atomic number 82 to sulfuric acid. This has caused, for example, meaning harm to estrus telephone commutation surfaces inwards air heaters inwards the ability industry.
- Biological fouling. Materials such equally algae, bacteria, molds, seaweed, in addition to barnacles carried inwards the procedure flow crusade biological fouling of the estrus transfer surfaces. Influenza A virus subtype H5N1 prime number representative of biological fouling is inwards marine ability constitute condensers.
- Freezing fouling. In this type off ouling, a liquid, or roughly ofits higher-eltingpoint components volition deposit on a subcooled estrus transfer surface.