(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 粉體同時(shí)具有固體和流體的特征，粉體的“固−液”轉(zhuǎn)變和表征粉體流動(dòng)性成為粉體科學(xué)與工程中的一個(gè)熱點(diǎn)和難點(diǎn)問(wèn)題。根據(jù)低速轉(zhuǎn)鼓中顆粒物質(zhì)表面流動(dòng)層剪切率 的線性特征，提出將tγ=1/ (即顆粒物質(zhì)發(fā)生剪切變形的時(shí)間)作為表征粉體流動(dòng)性的參數(shù)，并提出相應(yīng)的測(cè)量和計(jì)算方法，其結(jié)果與采用霍爾流量?jī)x測(cè)得的數(shù)據(jù)在特定條件下有良好的一致性。
關(guān)鍵字: 粉體；流動(dòng)性；表征
（The National Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: Granular matter behaves both like solid and liquid, and the solid-liquid transition as well as characterization of granular flow ability has been an intense research subject in physics and engineering. According to the linear characteristic of the velocity grads of the granular surface flowing layer, it is proposed that the deformation time Tγ can be used to describe the flow ability of granular matter. This method is simplicity and relevance, and the results are in good agreement with the data getting from the hopper and repose angle tests.
Key words: powder; flow ability; characterize
