NDLI: Experimental Study on the Mechanism of Turbulent Heat Transfer in Drag Reducing Flow by Surfactant Additives

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Experimental Study on the Mechanism of Turbulent Heat Transfer in Drag Reducing Flow by Surfactant Additives

Content Provider	Semantic Scholar
Author	Kawaguchi, Yuki Hishida, K.
Copyright Year	2003
Abstract	A drag-reducing surfactant solution flow in a two-dimensional channel is experimentally investigated. Simultaneous measurements of the velocity and temperature fluctuations in the thermal boundary layer are carried out. Two-component laser Doppler velocimetry (LDV) is used for measuring the velocity components and a fine-wire thermocouple probe for the temperature fluctuations at the same measurement location. The drag-reducing fluid tested is a dilute aqueous solution of a cationic surfactant, cetyltrimethylammonium chloride (CTAC), with 30 ppm concentration. Prior to measurement of the turbulent quantities, the gross flow characteristics of this drag-reducing solution are studied. The simultaneous measurements of velocity and temperature are made at inlet temperature of 31°C and at three different Reynolds numbers, Re = 3.5×10, 2.5×10 and 1.5×10, where the definition of Re is based on the channel height. The hydrodynamic and thermal turbulence structures and the turbulence productions and turbulence transport behaviors are then studied by analyzing the data sets of velocity and temperature fluctuations. The following terms are investigated: velocity and temperature statistics, Reynolds shear stress, turbulent heat fluxes in both the wall-normal and the streamwise directions, turbulence productions of both turbulent kinetic energy and temperature variance, eddy diffusivities for momentum and heat, and turbulent Prandtl number.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.nmri.go.jp/oldpages/turbulence/PDF/symposium/FY2002/Li.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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