Mass transfer from crystalline surfaces in a turbulent impinging jet. part 2: Erosion and diffusional transfer

Simultaneous erosion and diffusional transfer from transcinnamic acid coatings in submerged, axisymmetric, impinging jets of water has been studied at a Reynolds number of 100,000 and a nozzle height of 8 diameters. The concentration driving force was varied from zero to the acid solubility value. For low transfer rates roughness development was small and the two transfer modes were additive. At higher dissolution rates, however, diffusion enhanced erosion by loosening surface grains. This loosening action was largest in the impingement region where large surface roughness developed and further enhanced the high dissolution rates and subsequent interactions.