... transfer rates, as measured by the Nusselt number. It is found that the Strouhal number, and thus the vortex shedding frequency, of cylinders with smooth surfaces differs significantly from those with sharp edges. It is demonstrated that hexagonal cylinders have up to 33% higher St than other geometries...

... 0.25 to 6.25. The focus of this study is given on the dependence of G/W and C/W on the heat transfer from the wall and associated physics. The variation in the Strouhal number is presented as a function of C/W. It is observed that the effect of G/W on the vortex dynamics and heat transfer is much more...

... for the duration of such fluctuations can be estimated as the inverse of the peak frequency of the temperature spectrum. For the present configuration, the corresponding Strouhal number was about 0.35, which gives the “period” of temperature fluctuations as 15 t f ≈ 3 D U b There is ample...