Heat transfer augmentation in the transition region and low Reynolds number turbulent flows
Book
·
OSTI ID:455395
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Mechanical Engineering
The authors report experimental results of heat transfer in the region of transition to turbulence. The augmentation was induced through deployment of periodically placed cylindrical eddy promoters in parallel plane channel flows. Eight different configurations were used. The presence of eddy promoters displaced the point of transition from Reynolds number values of 1500 for the plane channel to around 400 for the least stable case. The value of Nusselt number at the transition for eddy promoters cases was up to 2.5 times higher than the one for the plane channel at the transition. Furthermore, the lower the transition Reynolds number, the higher the Nusselt number at the transition. For the cases where the diameter of the promoters was small and/or the pitch large, the heat transfer results in the transition region were consistent with values obtained from the Reynolds analogy when the analogy was based on the mean transport parameters, i.e., spatially averaged heat transfer coefficient and the wall shear stress, and the flow Reynolds number. At the other end of investigated geometries--large diameters and/or small pitch--the experimental results deviated from a prediction based on the Reynolds analogy which uses the spatially averaged transport parameters. This behavior is ascribed to the controlling influence of the local velocity and temperature in the immediate proximity of the promoters on the overall transport characteristics.
- OSTI ID:
- 455395
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1752-0
- Country of Publication:
- United States
- Language:
- English
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