本文關(guān)鍵詞： 剪切變稀體系 氣液兩相流 同心雙軸攪拌釜 氣含率 數(shù)值模擬　出處：《化工學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：氣液攪拌設(shè)備因其良好的適用性被廣泛應(yīng)用于過程工業(yè)中。為更好地比較不同工況下剪切變稀體系中的氣液分散情況,通過實(shí)驗(yàn)研究整體氣含率和相對(duì)功耗確定適宜的轉(zhuǎn)動(dòng)模式,進(jìn)而模擬研究表觀氣速、體系黏度、攪拌轉(zhuǎn)速對(duì)氣含率和氣泡尺寸的影響。結(jié)果表明,相同功率下內(nèi)外雙槳反向旋轉(zhuǎn)模式在理想氣液分散條件下,相較于單軸內(nèi)槳和內(nèi)外雙槳同向旋轉(zhuǎn)模式具有更高的氣含率和更好的氣體泵送能力;表觀氣速的增加有利于氣泡的均勻分散,但氣泡尺寸也會(huì)隨之增大;有效黏度的增加使得攪拌槳的影響區(qū)域變小,不利于氣泡的均勻分散,氣泡尺寸也隨之增大;攪拌轉(zhuǎn)速的增加使得循環(huán)渦流的影響區(qū)域變大,高氣含率區(qū)不斷擴(kuò)大。
[Abstract]:The gas-liquid mixing equipment is widely used in the process industry because of its good applicability. In order to better compare the gas-liquid dispersion in the shearing thinning system under different working conditions, The proper rotation mode was determined by the experimental study of gas holdup and relative power consumption, and the effects of apparent gas velocity, system viscosity and stirring speed on gas holdup and bubble size were simulated. Under the condition of ideal gas-liquid dispersion, the reverse rotation mode of internal and external propeller has higher gas holdup and better gas pumping capacity than the co-rotating mode of single axis inner propeller and inner and outer double propeller under the condition of ideal gas-liquid dispersion. The increase of apparent gas velocity is conducive to the uniform dispersion of bubbles, but the bubble size will also increase; the increase of effective viscosity makes the influence area of the impeller smaller, which is not conducive to the uniform dispersion of bubbles, and the bubble size will also increase. With the increase of stirring speed, the influence area of swirl and high gas holdup are enlarged.
【作者單位】： 浙江大學(xué)化工機(jī)械研究所;浙江誠泰化工機(jī)械有限公司;
【基金】：浙江省自然科學(xué)基金項(xiàng)目(LY16B060003) 浙江省重點(diǎn)科技創(chuàng)新團(tuán)隊(duì)項(xiàng)目(2011R50005) 國家自然科學(xué)基金項(xiàng)目(21206144)~~
【分類號(hào)】：TQ051.72
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本文編號(hào)：1525266