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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2018018925
pages 49-56

THERMOGRAPHIC ANALYSIS OF A TURBULENT NONISOTHERMAL WATER BOUNDARY LAYER

Irina A. Znamenskaya
Faculty of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russia
Ekaterina Y. Koroteeva
Faculty of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russia
Anastasia Shagiyanova
Faculty of Physics, Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119991, Russia

Краткое описание

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).


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