Free-Stream Turbulence From a Circular Wall Jet on a Flat Plate Heat Transfer and Boundary Layer Flow

Autor:	Richard B. Rivir, W. C. Elrod, R. MacMullin
Rok vydání:	1989
Předmět:	Jet (fluid) Boundary layer Dynamic scraped surface heat exchanger Materials science Convective heat transfer Turbulence Mechanical Engineering Film temperature Heat transfer coefficient Mechanics Boundary layer thickness
Zdroj:	Journal of Turbomachinery. 111:78-86
ISSN:	1528-8900 0889-504X
DOI:	10.1115/1.3262240
Popis:	The effects of the longitudinal turbulence intensity parameter of free-stream turbulence (FST) on heat transfer were studied using the aggressive flow characteristics of a circular tangential wall jet over a constant heat flux surface. Profile measurements of velocity, temperature, integral length scale, and spectra were obtained at downstream locations (2 to 20 x/D) and turbulence intensities (7 to 18 percent). The results indicated that the Stanton number (St) and friction factor (Cf) increased with increasing turbulence intensity. The Reynolds analogy factor (2St/Cf) increased up to turbulence intensities of 12 percent, then became constant, and decreased after 15 percent. This factor was also found to be dependent on the Reynolds number (Rex) and plate configuration. The influence of length scale, as found by previous researchers, was inconclusive at the conditions tested.
Databáze:	OpenAIRE
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