Heat and momentum transfer in flows adjacent to vibrating wall surfaces

The question of vibratory interaction between the motion of fluids and lapped surfaces has been drawing a growing attention over the last few decades due to the interest aroused by two conflicting problems, namely, the increase of heat transfer against the reduction of fluid dynamic drag. After the presentation of a thorough survey on the major researches produced on this subject, this writing will introduce an experimental equipment able to originate travelling vibrations (trains) along a wet wall section. A few exploratory and experimental tests carried out on the mentioned testing section, exposed lengthways to water flow are herein addressed. The vibratory power, motion regime and excitation frequency have been applied in a varying fashion. The results, visible through photographic processing, were duly in line with the procedure shown on this article. They revealed the presence of a few critical parameters whereby the phenomenon of heat or momentum transference between the fluid motion and the wall is optimised. Finally, on the base of an interpretation of the mechanics of turbulence near the wall, this writing suggests modifying the experimental equipment utilised in order to obtain objective and reliable outcomes as to energy saving, through vibrations applied along the wall surfaces.