Abstract
This chapter analyzes the effect of pulsating approaching flow on the flow field and convective heat transfer over an inline cylinder array at a subcritical Reynolds number Red,g= 3400 (based on cylinder diameter and the gap velocity across the minimum section) using the large eddy simulation (LES) technique. For steady approaching flow, a single mode of alternate vortex shedding with a constant Strouhal number (around 0.145) is observed behind all central cylinders. Flow pulsation at a frequency around twice the natural vortex shedding frequency affects the cylinder wake by reducing the recirculation bubble size behind the first row cylinder and increasing the transverse mixing. The heat transfer rate in the front part of the second row cylinder is enhanced because of the vortex shedding lock-on behind the first cylinder. LES computations of six-row cylinders demonstrates that heat transfer around the third row and downstream cylinders are not influenced much by the external pulsation.
Published Version
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