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风雨182木虫 (正式写手)
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| 图4-10是两种声压级条件下(SPL=100,130 dB),床内中心区颗粒轴向和径向瞬时速度分布图。由上图可清楚地看出,声压级对颗粒速度有明显影响作用。随声压级的增大,颗粒速度变化范围减小,速度变化趋势较平稳。原因是,随声压级的减小,气泡尺寸增大。由于气泡是鼓泡床内颗粒运动的主要推动力,气泡尺寸增大,颗粒受到的推动力增大,颗粒速度增大,如图4-10(a)和(c)。声压级为130 dB时,颗粒速度变化曲线较平缓,如图4-10(b)和(d)。 |
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sammi_deng
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sirljz(金币+2):谢谢交流 2010-04-18 20:35
sirljz(金币+2):谢谢交流 2010-04-18 20:35
| Figure 4-10 is the instantaneous velocity profile of particle axial and radial directions in the center of the bed under the condition of two sound pressure level (SPL = 100,130 dB). As can be seen clearly from the above chart, sound pressure level has the significantly influence on the particles' speed. With the sound pressure level increasing, the range of the particle velocity decreases , and the speed becomes more stable. The reason is that with the sound pressure level decreasing, the size of the bubble increases. Because the bubble is the main driving force to the particle motion in a bubble column, when bubble size increases, the driving force of the particle increases as well as the particle velocity, which is shown in Figure 4-10 (a) and (c). When sound pressure level is 130 dB , the particle velocity curves more gently, which is shown in Figure 4-10 (b) and (d). |
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