ABSTRACT

The present experimental and numerical analysis reports the thermal performance of circular synthetic jets involving sinusoidal and triangular waveforms. The Reynolds number, dimensionless axial distance, the dimensionless stroke length, and the driving frequency are varied within 4150–5600, 1–18, 5–13, and 80–250 Hz. The average Nusselt number obtained from the triangular waveform exhibits 11% higher heat transfer than the sinusoidal waveform of the synthetic jet. The thermal characteristics of synthetic jet and steady jet are compared, and it is found that synthetic jets exhibit 38.6% higher thermal performance than continuous jets in the far-field region. Also, correlation is proposed for the average Nusselt number.

摘要

目前的实验和数值分析报告了涉及正弦波和三角波的圆形合成射流的热性能。雷诺数、无量纲轴向距离、无量纲冲程长度和驱动频率在 4150–5600、1–18、5–13 和 80–250 Hz 范围内变化。从三角波形获得的平均努塞尔数显示出比合成射流的正弦波形高 11% 的热传递。比较合成射流和稳定射流的热特性，发现合成射流在远场区域的热性能比连续射流高38.6%。此外，还提出了平均努塞尔数的相关性。