The spatial and temporal structure of thermal fluctuations associated with a vertical turbulent jet impinging a water surface: laboratory experiments and field observations

K. Peter Judd; Ivan B. Savelyev; Geoffrey B. Smith; George Marmorino

doi:10.1117/12.919242

11 June 2012 The spatial and temporal structure of thermal fluctuations associated with a vertical turbulent jet impinging a water surface: laboratory experiments and field observations

K. Peter Judd, Ivan B. Savelyev, Geoffrey B. Smith, George Marmorino

Author Affiliations +

Proceedings Volume 8372, Ocean Sensing and Monitoring IV; 837208 (2012) https://doi.org/10.1117/12.919242
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Infrared imaging, in both laboratory and field settings, has become a vital tool in diagnosing near-surface thermalhydrodynamic phenomena such as convective cells, accumulation of surfactant, and coherent turbulent structures. In this presentation, we initially focus on a laboratory scale (0.01-1m) subsurface vertical turbulent water jet that serves as a canonical flow. The jet has a slightly elevated temperature thus the warmer fluid serves as a passive marker. Infrared image sequences of the surface thermal field were collected for various water jet flow rates and for both "clean" and surfactant-contaminated surface conditions. Turbulent characteristics of the near-surface flow field were measured by means of Digital Particle Image Velocimetry (DPIV), and these are used to examine the statistical nature of the coupled thermal-hydrodynamic field. An analog of the laboratory jet is the discharge of power-plant cooling water through a vertical pipe on the ocean floor. High-resolution airborne infrared imagery has recently been acquired of such a discharge (from the Huntington Beach Generating Station, CA), and these data are compared with the laboratory results in an attempt to understand striking spatial patterns discovered on the ocean surface.

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K. Peter Judd, Ivan B. Savelyev, Geoffrey B. Smith, and George Marmorino "The spatial and temporal structure of thermal fluctuations associated with a vertical turbulent jet impinging a water surface: laboratory experiments and field observations", Proc. SPIE 8372, Ocean Sensing and Monitoring IV, 837208 (11 June 2012); https://doi.org/10.1117/12.919242

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