Abstract
This paper presents experimental and numerical results on the unstable flow along the surface of a circular cylinder in the Coanda effect. The unstable phenomenon depends on the nominal Reynolds number Re*=Uj√ (1/4) hD/ν and the nozzle height of the jet, h. In this paper, the changing phenomenon of two-dimensional jet direction is found numerically and the results are compared with the experimental ones. The numerical calculation is carried out by using the finite-difference method for the conditions of unstable phenomenon, that is, 1.5×104≤Re*≤2.5×104 and 0.100≤h/D≤0.200. Numerical results agree well with experimental results qualitatively. Also, it is found that the unstable phenomenon is sensitive to both Re* and h/D in the vicinity of h/D=0.10. Furthermore, a hysteresis phenomenon of jet direction by Re* was observed.
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