本文選題：顆粒氣體　切入點(diǎn)：微重力　出處：《物理學(xué)報(bào)》2016年01期

【摘要】：顆粒體系由于非彈性碰撞和摩擦等內(nèi)秉的能量耗散特性,由宏觀粒子形成的顆粒氣體體系經(jīng)常會(huì)有局部凝聚現(xiàn)象,這是顆粒氣體體系與分子氣體體系的最大區(qū)別之一.理解和預(yù)測(cè)這一現(xiàn)象的發(fā)生將有助于人們對(duì)遠(yuǎn)離平衡態(tài)體系的復(fù)雜現(xiàn)象,如有序結(jié)構(gòu)、斑圖和團(tuán)簇形成的認(rèn)知.這種局部凝聚現(xiàn)象可以類比于分子氣體中亞穩(wěn)分解形成的液滴,將氣液相分離用于解釋和尋求局部凝聚現(xiàn)象的此模型得到了分子動(dòng)力學(xué)模擬的校驗(yàn).但是實(shí)驗(yàn)的校驗(yàn)卻由于宏觀粒子運(yùn)動(dòng)受重力作用的影響難以在實(shí)驗(yàn)室中實(shí)現(xiàn).作為實(shí)踐十號(hào)衛(wèi)星的前期實(shí)驗(yàn),本文利用國(guó)家微重力實(shí)驗(yàn)室落塔裝置,以水平激振裝有不同尺寸和數(shù)目的顆粒樣品,在短時(shí)微重力條件下,成功觀察到顆粒氣體團(tuán)簇的形成;并將實(shí)驗(yàn)結(jié)果與顆粒氣體類范德瓦耳斯氣體分子相分離模型對(duì)比,由形成團(tuán)簇樣品的顆粒數(shù)密度條件,來(lái)實(shí)驗(yàn)確定了所選顆粒的恢復(fù)系數(shù),得到直徑為0.5 mm的鈦珠顆粒的恢復(fù)系數(shù)在0.6—0.8之間,直徑為1 mm的鈦珠顆粒的恢復(fù)系數(shù)約為0.8,直徑為2.5 mm的鈦珠顆粒的恢復(fù)系數(shù)應(yīng)大于0.8.
[Abstract]:Due to the energy dissipation characteristics of inelastic collision and friction, particle gas systems formed by macroscopic particles often exhibit local condensation. This is one of the biggest differences between a granular gas system and a molecular gas system. Understanding and predicting the occurrence of this phenomenon will contribute to the understanding of complex phenomena far from equilibrium systems, such as ordered structures, Pattern and cluster formation. This phenomenon of local condensation can be analogous to the formation of droplets formed by the metastable decomposition of molecular gases. The model of gas-liquid phase separation is used to explain and seek local condensation phenomenon. The verification of molecular dynamics simulation is obtained, but the verification of experiment is difficult to be realized in the laboratory because of the effect of gravity on the macroscopic particle motion. As a preliminary experiment in the practice of satellite 10, In this paper, the formation of granular gas clusters has been successfully observed under the condition of short-term microgravity by using the tower dropping device of the National Microgravity Laboratory and the horizontal excitation with different size and number of particle samples. The experimental results are compared with the van der Waals gas molecular separation model, and the recovery coefficient of the selected particles is determined by the particle number density condition of the cluster sample. The recovery coefficient of titanium beads with diameter of 0.5 mm is between 0.6-0.8, and that of titanium beads with diameter of 1 mm is about 0.8. The recovery coefficient of titanium beads with diameter of 2.5 mm should be greater than 0.8.
【作者單位】： 北京理工大學(xué)物理學(xué)院;中國(guó)科學(xué)院物理研究所軟物質(zhì)物理重點(diǎn)實(shí)驗(yàn)室北京凝聚態(tài)物理國(guó)家實(shí)驗(yàn)室;
【基金】：中國(guó)科學(xué)院空間科學(xué)戰(zhàn)略性先導(dǎo)科技專項(xiàng)(批準(zhǔn)號(hào):XDA04020200) 國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11274354,11474326) 地震行業(yè)科研經(jīng)費(fèi)(批準(zhǔn)號(hào):201208011)資助的課題~~
【分類號(hào)】：O347.7

【相似文獻(xiàn)】

相關(guān)期刊論文 前7條

1 張孝謙;微重力落塔成功地實(shí)現(xiàn)上拋工作模式[J];中國(guó)科學(xué)院院刊;2000年04期

2 王龍;;落管與落塔[J];科學(xué);1988年01期

3 屈少波;閆奇眾;田蔚;吳書朝;;落塔微重力水平激光干涉測(cè)量方法中的干擾因素分析[J];空間科學(xué)學(xué)報(bào);2008年01期

4 柳綺年;德國(guó)Bremen落塔[J];力學(xué)與實(shí)踐;1992年04期

5 吳海,郝慶洲,袁龍根,吳文東,張孝謙;NMLC落塔自由落體裝置的下落加速度特性[J];工程熱物理學(xué)報(bào);2002年S1期

6 李晶;趙建福;薛艷芳;魏進(jìn)家;杜王芳;郭棟;;孤立氣泡生長(zhǎng)過(guò)程的短時(shí)微重力落塔實(shí)驗(yàn)研究[J];空間科學(xué)學(xué)報(bào);2012年04期

7 ;[J];;年期

相關(guān)碩士學(xué)位論文 前1條

1 湯潔;落塔微重力水平的激光干涉測(cè)量方法研究[D];華中科技大學(xué);2005年

，

本文編號(hào)：1670036