Spectral peculiarities of turbulent pulsations of submerged water jets

Analysis of large visualization datasets for thermographic studies in fluid dynamics

“…Modern devices have high sensitivity (up to 20 MK) [13], which is successfully used for studying heat transfer, in particular, caused by turbulent flow. Previously, a method for thermography of high-speed flows was proposed [14]. As a result of its application to the study of a number of model jet flows, large experimental data amounts were obtained.…”

Thermal spot velocimetry inside a boundary layer in water

“…The current achievements in infrared technology allowed for new approaches to flow visualization. Recently, we have proposed an infrared-based method for the quantitative analysis of turbulent characteristics of near-wall liquid flows [3,4]. The method implies high-speed imaging of turbulent thermal fluctuations from a near-wall boundary layer through solid windows transparent to mid-wave infrared radiation.…”

Optimal submerged waterjet for gas recovery based on Arbitrary Lagrange‐Euler

“…It shows AE signal frequencies from fluid dynamics, and rock failures are in different ranges: The rock failure frequencies are within a higher range of 100‐200 kHz, while the jet frequencies are below 50 kHz, and there is a linear relationship between the AE energy and the cutting depth, irrespective of rock type. Besides, the spectra of turbulent jet temperature pulsations at 1‐40 Hz frequencies have been experimentally studied via high‐speed thermography of the water layer boundary . Due to the limited experimental conditions, it is still extremely difficult to observe the breaking process and the stress evolution of coal in milliseconds.…”