[外文翻譯]混合動(dòng)力行星混凝土攪拌中顆粒轉(zhuǎn)變?yōu)榱黧w的特性化描述


收到2007年7月2日，
經(jīng)修訂2008年5月30日
接受2008年6月5日。
可在線2008年6月7日。
摘要
    在混凝土攪拌機(jī)中增加產(chǎn)品投放會(huì)在混凝土攪拌過程中產(chǎn)生一個(gè)強(qiáng)大且快速的沖擊作用。據(jù)可靠實(shí)驗(yàn)數(shù)據(jù)顯示，一個(gè)實(shí)際的行星式混凝土攪拌機(jī)在實(shí)驗(yàn)室條件下將全面的展示一定狀態(tài)的混合物在混合攪拌過程中的混合轉(zhuǎn)化情況。更確切的說，一個(gè)偵測(cè)顆粒狀物料轉(zhuǎn)變成顆粒漿狀過程中相應(yīng)的混合物凝聚力變化（如下，所謂的“過渡時(shí)期”）的方法，就是通過使用混合功率測(cè)量?jī)x，這個(gè)過程就會(huì)很好的表達(dá)。而且，這個(gè)過渡實(shí)現(xiàn)以后，攪拌功率的消耗是與混合物流變學(xué)有關(guān)，可以用一個(gè)簡(jiǎn)化的幾何假設(shè)表達(dá)。通過無量綱分析，同樣可以得到這樣一個(gè)幾何假設(shè)。最后，這個(gè)幾何假設(shè)將表明混合物的發(fā)際線以外的行為可以被很好地?cái)M合成雙曲線方程。在這個(gè)過渡時(shí)期，相應(yīng)的混合粉狀進(jìn)化情況就可以用層面力量來預(yù)測(cè)。這些結(jié)論適合推廣應(yīng)用在生產(chǎn)監(jiān)控過程中。
關(guān)鍵詞：混合；混凝土；攪拌機(jī)；顆粒狀物料。

Characterization of the granular-to-fluid state process during mixing by power evolution in a planetary concrete mixer
Received 2 July 2007; 
revised 30 May 2008; 
accepted 5 June 2008. 
Available online 7 June 2008.
Abstract
Adding product into the mixer exerts a strong and rapid impact during concrete mixing. Experimental data obtained from a planetary mixer in a full-scale concrete plant under laboratory conditions show that the state of mixture progress with mixing time is well described by the mixing power evolution. More specifically, a reliable method for detecting the time corresponding to the transformation of a mixture from a cohesive granular material into a granular paste (i.e. the so-called “transition time”), through use of a mixing power measurement, will be presented herein. Moreover, once this transition has been achieved, mixing power consumption will be related to mixture rheology and then to mixer geometry by means of a simplified hypothesis. This equation can also be obtained via a dimensionless analysis. Lastly, it will be shown that mixture behavior beyond the transition point is well fitted by a hyperbolic equation. The corresponding mixing power evolution can then be predicted by the level of power at this transition time. These results are suitable for application to online process monitoring.
Keywords: Mixing; Concrete; Power consumption; Complex fluids; Granular materials