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In this study, the solutions of second order difference equations were examined with respect to whether they were Schur stable and oscillatory or not. The results determining under which perturbation the solutions retain their characteristics were given. The obtained results were analyzed with numerical examples. [ABSTRACT FROM AUTHOR]

In this study, a sinusoidally oscillating jet injected through a rectangular slot between two infinite horizontal plates was considered. Bottom plate was kept at constant temperature and the top plate was insulated. The oscillating air jet, issued from a rectangular slot on the top plate was impinged on the bottom hot plate. A computer program was developed by using the control volume technique and SIMPLE algorithm. Using this computer program, flow and heat transfer characteristics of the jet flow were numerically analyzed. The effects of the H/W, oscillation amplitude and oscillation frequency on the flow and heat transfer were investigated. It was observed that the stagnation point Nusselt number decreases with the increasing H/W ratio, but variation in the Nusselt number for H/W greater than 2 is very small. It is also observed that the oscillation of jet has no effect on stagnation Nusselt number when H/W is approximately less than 1.5. However, at the cases when H/W is greater than 1.5 the oscillating increases the Nusselt number with respect to the Nusselt number of a steady jet. [ABSTRACT FROM AUTHOR]

In this study, characteristics of heat transfer and pressure loss of oscillating pipes at certain amplitudes and frequencies were investigated. For this aim, an oscillating mechanism was designed. Experiments were conducted for the oscillating frequency f , in the range of 0.008- 1.988 Hz and dimensionless amplitude X=3, 6, 9. Reynolds number was changed from 5000 to 25000. It was determined that oscillating amplitude and frequency was reasonably effective on heat transfer and friction factor. [ABSTRACT FROM AUTHOR]