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液—液循環(huán)流化床液滴形成特性研究
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國家自然科學基金資助項目(50906021);河南省科技攻關資助項目(102102210162);河南省自然科學研究計劃資助項目(2009A470002)


Drop Formation Characteristic of Liquid-liquid Circulating Fluidized Bed
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    摘要:

    基于圖像采集與處理方法對液—液循環(huán)流化床液滴形成特性進行了實驗研究,，提出了形成液滴的3種液—液霧化方式,，考察了液—液霧化方式與射流長度脈動,、液滴粒徑分布的相關性,，獲得了液—液霧化方式的轉變規(guī)律以及霧化強度,、射流長度脈動和液滴粒徑分布基于相對雷諾數(shù)的變化規(guī)律,。結果表明, 霧化過程與相對雷諾數(shù)密切相關,，隨著相對雷諾數(shù)的增加,，霧化強度持續(xù)增強,，液—液霧化方式由滴流型向層流射流型轉變,，最后發(fā)展為湍流射流型；在整個相對雷諾數(shù)實驗范圍內,，射流長度的脈動表現(xiàn)出隨機和非周期的特點,，其標準方差與平均值的變化規(guī)律基本一致，在相對雷諾數(shù)為1.3×104時達到最大值,；液滴的粒徑分布參數(shù)一直增大到湍流射流型霧化階段,，在相對雷諾數(shù)為2.5×104時，液滴的粒徑均勻性最好,，而液滴平均粒徑總體上隨相對雷諾數(shù)的增大不斷減小,，形成液滴的最小平均粒徑發(fā)生在湍流射流型霧化階段。

    Abstract:

    Drop formation characteristic of liquidliquid circulating fluidized bed (LLCFB) were experimentally studied by means of image gathering and processing. Three typical liquid-liquid atomization forms related to drop formation were defined. The relativity was investigated between liquidliquid atomization forms and jet length fluctuation or drop size distribution, and the change rules of liquidliquid atomization forms, jet breakup intensity, jet length fluctuation and drop size distribution were obtained with the relative Reynolds number (Rer) between the two phases. The results showed that the course of drops formation rested seriously with Rer. Along with increasing Rer, jet break up intensity was strengthened continually and liquid-liquid atomization formed by trickling to the laminar jet transformation, developed finally for turbulent motion jet. Jet length fluctuation was characterized by random and no periodic. The overall change tread of standard derivation was consistent with average jet length each other with Rer, and their maximum happened at 1.3×104. Furthermore, spread parameter of drop size distribution increased to the stage of turbulent motion jet atomization and the uniformity appeared at 2.5×104, but the average diameter of drops always decreased with increasing Rer and its maximum at the stage of turbulent motion jet atomization.

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梁坤峰,高春艷,王林.液—液循環(huán)流化床液滴形成特性研究[J].農業(yè)機械學報,2011,42(8):228-234. Liang Kunfeng, Gao Chunyan, Wang Lin. Drop Formation Characteristic of Liquid-liquid Circulating Fluidized Bed[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(8):228-234.

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