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- W2799914270 abstract "Abstract Synthetic jet, potentially useful in electronic cooling, is numerically studied considering various waveforms for the purpose of heat transfer enhancement and compare to the corresponding steady air jet. In the present study, sinusoidal, rectangular and triangular synthetic jets are applied to a confined two-dimensional slot jet impinging on a heated plate adopting SST/k-ω turbulence model. The jet frequency is varied from 10 to 400 Hz for Reynolds numbers (Re) in the range of 1553–7766 (Strouhal number 0.012 ≤ St ≤ 2.4) and jet-to-surface distances ranging from 2 to 8. Generally, the cooling performance is enhanced by increase in Re and with the increase in frequency and H/W, the cooling performance shows a first increase and then decrease trend. Results of simulation indicate that conditions at the turning frequency correspond to critical St = 0.24–0.48 have higher heat transfer rate than other cases at the same Re. When St sinusoidal jets > rectangular jets. Time sequence of streamline and velocity contour image is presented to further explain this phenomenon. Moreover, most conditions show good heat transfer enhancement compare to the corresponding steady jet except conditions in which St is too high (St > 1.2) or H/W is too low, or H/W is too large (H/W = 2 or H/W = 8). The maximum heat transfer enhancement coefficient of synthetic jets is found to be 74.7% higher than that of the corresponding steady jet." @default.
- W2799914270 created "2018-05-17" @default.
- W2799914270 creator A5032533270 @default.
- W2799914270 creator A5073070877 @default.
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- W2799914270 date "2018-10-01" @default.
- W2799914270 modified "2023-10-16" @default.
- W2799914270 title "Numerical investigation of heat transfer characteristics of impinging synthetic jets with different waveforms" @default.
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- W2799914270 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2018.04.120" @default.
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