(大連大學(xué)化學(xué)與化學(xué)工程系， 大連 116622*東北大學(xué)資源與環(huán)境工程系， 沈陽(yáng) 110006
)
摘 要: 考察了湍流頻率對(duì)水力旋流器內(nèi)固液兩相間相對(duì)運(yùn)動(dòng)的影響。 研究表明， 顆粒與流體在切向與軸向的跟隨性與湍流頻率的關(guān)系比較簡(jiǎn)單， 即隨湍流頻率的增加兩相間的跟隨性下降， 但在旋流器的半徑方向， 由于湍流脈動(dòng)與離心沉降的聯(lián)合作用， 顆粒與流體的跟隨呈復(fù)雜的變化。 視顆粒粒度的不同， 徑向跟隨性指標(biāo)ηr(表征顆粒速度與流體速度之比)與湍流頻率ω的關(guān)系有三種基本形式： 對(duì)小顆粒， ηr隨ω的增加出現(xiàn)極大值， 但ηr始終為正(顆粒與流體的運(yùn)動(dòng)同向)； 對(duì)中等粒度的顆粒， 隨ω的增大， ηr由負(fù)而正， 并在正負(fù)區(qū)各出現(xiàn)一次極值； 對(duì)大顆粒，ηr雖也存在由負(fù)而正的變化， 但極大值只出現(xiàn)在正值區(qū)。 文中對(duì)這些現(xiàn)象給出了合理的解釋。
關(guān)鍵字: 水力旋流器 顆粒運(yùn)動(dòng) 湍流頻率 跟隨特性
PART Ⅲ: EFFECT OF TURBULENCE FREQUENCY
（Department of Chemical Engineering,Dalian University, Dalian 116622, P. R. China
Department of Resources and Environment Engineering,
Northeastern University, Shenyang 110006, P. R. China
）
Abstract:The effect of fluid turbulence frequency on the relative motion between solid particles and liquid medium in hydrocyclones was examined with follow-up parameter η and turbulence frequency ω. It is shown that the parameters in tangential and vertical directions have simpler relation with turbulence frequency, i.e. the relative motion, as expected, gets more obvious with the increase of turbulence frequency; but in radial direction the lags between particles and fluid behave much more complicated than in other two directions due to the existence of centrifugal force. Three basic behavior forms are found for particles with different diameters and the mechanism are explained.
Key words: hydrocyclones particle motion turbulenc, e frequency follow-up situation
