每年出版 4 期
ISSN 打印: 1065-3090
ISSN 在线: 1940-4336
Indexed in
THERMOGRAPHIC ANALYSIS OF A TURBULENT NONISOTHERMAL WATER BOUNDARY LAYER
摘要
The paper is devoted to the investigation of the turbulent water boundary layer in jet mixing flows using high-speed infrared (IR) thermography. Two turbulent mixing processes were studied: a submerged water jet impinging on a flat surface and two intersecting jets in a round disc-shaped vessel. An infrared camera (FLIR Systems SC7700) was focused on the window transparent for IR radiation; it provided high-speed recordings of heat fluxes from a thin water layer close to the window. Temperature versus time curves at different points of water boundary layer near the wall surface were acquired using an IR camera with a recording frequency of 100 Hz. The time of recording varied from 3 to 20 min. The power spectra for the temperature fluctuations at different points in the mixing zone were calculated using the fast Fourier transform algorithm. The obtained spectral behavior was compared to the Kolmogorov "-5/3 spectrum" (a direct energy cascade) and the dual-cascade scenario predicted for quasi-2D turbulence (an inverse energy cascade to larger scales and a direct enstrophy cascade to smaller scales).
-
Golub Victor, Elyanov Artem, Korobov Andrei, Mikushkin Anton, Petukhov Vyatcheslav, Volodin Vladislav, Influence of heat absorption on hydrogen-air flame instability, Experimental Thermal and Fluid Science, 109, 2019. Crossref
-
Contino Mattia, Paolillo Gerardo, Greco Carlo Salvatore, Astarita Tommaso, Cardone Gennaro, Simultaneous visualization of the velocity and wall temperature fields in impinging swirling jets, Optics and Lasers in Engineering, 158, 2022. Crossref
-
Koroteeva Ekaterina, Shagiyanova Anastasia, Znamenskaya Irina, Sysoev Nikolay, Time-resolved thermographic analysis of the near-wall flow of a submerged impinging water jet, Experimental Thermal and Fluid Science, 121, 2021. Crossref