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旋流干燥器內(nèi)部的流場(chǎng)非常復(fù)雜，使得旋流干燥器的研究存在很大的困難。氣體以切向進(jìn)入干燥體，這有助于強(qiáng)化氣固兩相的傳遞過程，同時(shí)切向流動(dòng)加劇了固相顆粒間相互的摩擦與碰撞，也增大了顆粒與氣流的接觸面積，加快了顆粒的干燥。由于旋流板的作用，進(jìn)一步使氣固湍動(dòng)作用加劇，使得不同粗細(xì)的顆粒得以均勻的干燥。目前，對(duì)于旋流干燥器的理論與實(shí)驗(yàn)研究均非常少見，本文將借助計(jì)算機(jī)模擬技術(shù)和實(shí)驗(yàn)對(duì)其進(jìn)行初步的探討。
本文主要采用計(jì)算流體動(dòng)力學(xué)CFD方法對(duì)旋流干燥器中氣固兩相流速度場(chǎng)進(jìn)行了CFD模擬分析，研究了單相流場(chǎng)、氣固兩相流場(chǎng)、顆粒的體積分率、顆粒運(yùn)動(dòng)軌跡、壓力損失。
首先，本文采用三種模擬湍流的常見模型－－標(biāo)準(zhǔn)模型、RNG 模型、Reynolds應(yīng)力模型(RSM模型)對(duì)旋流干燥器相流場(chǎng)進(jìn)行模擬，經(jīng)比較得出RSM模型更適合于模擬旋流干燥器內(nèi)的流場(chǎng)。然后，采用RSM模型對(duì)氣固兩相進(jìn)行耦合計(jì)算。通過對(duì)氣相流場(chǎng)的模擬得出了旋流干燥器內(nèi)速度場(chǎng)軸向、徑向、切向三維分速度的分布特征。三者以切向速度為主，其值遠(yuǎn)大于其它兩個(gè)方向的速度。并進(jìn)一步分析壓力的分布規(guī)律以及和進(jìn)口氣速的關(guān)系。
其次，對(duì)氣固兩相流動(dòng)進(jìn)行模擬，氣相采用歐拉坐標(biāo)系下的RSM模型，顆粒相分別采用兩種模型－歐拉坐標(biāo)系下的混合模型和拉格朗日坐標(biāo)系下的隨機(jī)軌道模型進(jìn)行模擬，同時(shí)考慮相互的耦合作用。結(jié)果：① 混合模型模擬給出了固體顆粒在干燥器內(nèi)的分布情況，結(jié)果表明固體顆粒的體積分率隨著徑向的增大而增大，在干燥器壁含量最高。② 隨機(jī)軌道模型模擬給出了顆粒的運(yùn)動(dòng)軌跡，表明顆粒在干燥器內(nèi)的運(yùn)動(dòng)具有很大的隨機(jī)性。
最后，為了更好的了解旋流干燥器的流動(dòng)特性，本文對(duì)旋流干燥器內(nèi)停留時(shí)間的分布進(jìn)行了實(shí)驗(yàn)測(cè)定。

通過把部分實(shí)驗(yàn)數(shù)據(jù)與模擬結(jié)果進(jìn)行對(duì)比，發(fā)現(xiàn)數(shù)值模擬的結(jié)果和實(shí)驗(yàn)數(shù)據(jù)較為吻合，從而驗(yàn)證了所建模型的正確性，對(duì)今后的設(shè)計(jì)以及理論研究工作具有一定的參考意義。

[ Last edited by Mercuryjie2008 on 2011-3-20 at 07:43 ]

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1樓 2011-03-19 15:46:26

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Mercuryjie2008(金幣+100, 翻譯EPI+1): 非常感謝啊 2011-03-21 19:22:11

Flow field inside of cyclone dryer is very complicated, thus making the research extremely difficult. The gas tangentially flows into the drying body, which helps strengthen the transmission of gas-solid process, enhance the collision or friction between solid particles, increase the contact area between particles and air flow, and speed up the air drying process. Due to the cyclone board, gas-solid turbulent action becomes further intensified, which makes different scales of the particles dried homogeneously. At present, either theoretical or experimental studies about cyclone dryer are rare. Our paper is a preliminary research on this respect with the help of computer simulation and some experiments.
In this paper, we mainly take the computational fluid dynamics CFD methods to simulate the flow velocity field of gas-solid inside the dry body, and analyze the single-phase flow field, gas-solid flow field, particle volume fraction, particle motion track, the pressure loss.
Firstly, we assume three common turbulence simulation model - the standard model, RNG model, and Reynolds stress model (RSM model) to simulate fluid flow field, and find RSM model is more suitable by comparison, so we adopt the RSM model for gas-solid coupling calculation. By gas flow field simulation, we obtain axial, radial, tangential 3D velocity field distribution, finding tangential velocity is much larger than the others. Further analysis focus on principle of pressure distribution and its relationship with gas incoming speed.
Secondly, simulation on gas-solid flow is made. Euler coordinate RSM model is used for gas simulation, and two models are used for particles simulation - Euler coordinate hybrid model and Lagrange coordinate stochastic model. The mutual coupling is also taking into account during the computing process. Conclusions: ① The hybrid model simulation shows the solid particles distribution in the dryer, namely the volume fraction of solid particles increases along with the radial direction, and reach the highest on the wall. ② stochastic model shows the particle trajectories, indicating that the movement of particles in the dryer is randomness.
Finally, in order to get a better understanding of the dynamic characteristics of cyclone dryer, we detect the particles’ residence time in the dryer.
By comparing some experimental data and simulation results, we find they agree well, which proves the correctness of our simulation. And we believe our work has a certain reference value for further design or theoretical research.

正好我也是做模擬的，剛好看到了，順便翻譯一下。

贊一下(1人)

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2樓2011-03-20 20:21:22

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