Abstract
An experimental investigation of the transport processes of heat has been made in the thermal entrance region of a fully developed turbulent pipe flow. Statistical quantities closely related to turbulent heat transfer have been measured and analyzed. Basic data presented can be used for assessing or developing a turbulence model for heat transfer. Turbulence quantities such as the temperature intermittency factor and the skewness and flatness factors of temperature fluctuations are found to have similarities in the growing thermal layer. Also, from the results of conditional analyses, the weighted probability density function of a turbulent heat flux, and the wavelet transform of velocity and temperature fluctuations, it becomes evident that the ejection-type fluid motions dominate the heat transfer in the outer intermittent region and play a key role in the evolution of the thermal boundary layer.
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Nagano, Y., Sato, H., Tagawa, M. (1995). Structure of Heat Transfer in the Thermal Layer Growing in a Fully Developed Turbulent Flow. In: Durst, F., Kasagi, N., Launder, B.E., Schmidt, F.W., Suzuki, K., Whitelaw, J.H. (eds) Turbulent Shear Flows 9. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78823-9_21
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DOI: https://doi.org/10.1007/978-3-642-78823-9_21
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