We propose a new methodology for the quantitative analysis of fluid boundary layers based on high-speed thermographic measurements. The methodology is tested on a boundary-layer flow formed by a single submerged round jet impinging on an infrared-transparent flat plate. We calculate the power spectra of fluctuations in thermal radiation recorded from a thin near-wall boundary layer for a wide range of initial flow parameters. The results show that changes in power spectra scaling can be directly related to the transitions in a flow pattern within the boundary layer.
This work explores the potential of high-speed infrared (IR) thermography to analyze a turbulent water boundary layer in submerged jet flows. In the experiments, the IR camera (FLIR Systems SC7700) is focused on the inner side of an IR-transparent vessel window, providing high-speed (100 Hz) recordings of heat fluxes from a thin water layer close to the window. The temperature variations are shown to act as a passive tracer in the considered turbulent flows. The power spectra of the turbulent fluctuations are calculated for different points in the near-surface flows and compared to the existing theoretical turbulence models.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.