A Consideration on Heat Transfer Mechanism of Two-Dimensional Impinging-Jet-Disturbed-by-an-Elastically-Suspended-Circular Cylinder (Effects of Intermittency on Heat Transfer)
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One of the circular cylinders with several diameters was elastically suspended with spring in the jet impingement region between a jet slot and a heat transfer target plate. The slot-to-plate distance H was kept constant to be 3 or 5 times of the slot width, h=15mm. The Reynolds number was fixed at 10,000, being exceptionally 5,000 in the case of flow visualization. Periodical swinging motion of the cylinder across the jet was observed because of the cylinder vibration self-induced with the jet flow. Time traces of velocity near the target plate were detected by hot-wire anemometer. Examination was carried out on the relation between the patterns of intermittency function defined by threshold levels of turbulence intensity and heat transfer near the stagnation region. The patterns could be classified into three ones in the case of H/h=3. Two kinds of types resulted in enhancement of heat transfer in the case of H/h=3. However, There was no remarkable difference of the pattern by the existence of circular cylinder insertion in the jet in the case of H/h=5.
二次元衝突噴流中に弾性支持円柱を挿入した際の熱伝達機構に関する一考察(熱伝達に及ぼす間欠性の影響)
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