The influence of the rib width on the performance of tubes with the separation and reattachment enhancement mechanism
This paper presents numerically predicted turbulent heat-transfer and friction-factor results for tubes with transverse, rectangular ribs for different width-to-height ratios. The rib spacing was maintained at values where the separated flow over the rib reattached between adjacent ribs (i.e. the separation and reattachment enhancement mechanism). The mean Nusselt number was found to decrease slightly with an increase in the width to height ratio for low Prandtl number fluids (Pr = 0.71). However, the trend is more complex for higher Prandtl number fluids. The mean Nusselt number can either increase or decrease depending on the magnitude of the Prandtl number and rib spacing. The friction factors decreased with an increase in the width to height ratio and the magnitude of this decrease was somewhat Reynolds number dependent.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6853553
- Report Number(s):
- ANL/CP-75904; CONF-921110-38; ON: DE93004248
- Resource Relation:
- Conference: Winter annual meeting of the American Society of Mechanical Engineers (ASME), Anaheim, CA (United States), 8-13 Nov 1992
- Country of Publication:
- United States
- Language:
- English
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