| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
|
|---|
| Research Abstract |
In this study, the effects of aeration and agitation conditions, such as aeration rate, Q[L/min], and impeller rotational speed, n[n^<-1>], on the mixing rate for slurry-like fluids possessing a yield stress were quantitatively investigated in a stirred vessel equipped with a concave impeller, when a Cavern region occurs. We defined the mixing rate constant, k_s[n^<-1>], based on the dynamic change of the ratio of the unmixed area to the whole vertical area of the vessel, using an image analysis method. It was found that regardless of the value of Q, ks increased drastically with an increase in n, when the rotational speed was above a certain value, and this was effective in improving the mixing state. It was also found that this improvement was attributable to the fact that the floating pattern of the bubbles due to the discharge flow from the impeller changed.
|
