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本文根据文[1]给出的经过修正的层流流动的流动稳定性理论及平行剪切流中平均速度的一类修正剖面,研究了平行剪切流的非线性稳定性性质,并在本文的假设下,把背景湍流噪声的干扰引入了流动稳定性计算,对于平面Poiseuille流动和圆管Poiseuille流动,得到了与实验趋势相一致的结果. 相似文献
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非定常修正下平面Poiseuille流动的线性稳定性性质 总被引:1,自引:1,他引:0
本文在文[1]的基础上,用多重尺度法进一步研究了在非定常修正剖面作用下平面Poiseuille流动的线性稳定性性质,发现文[1]所给出的修正剖面在扰动发展的初期,在一定条件下会促进扰动的发展,从而增大流动失稳的可能性. 相似文献
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本文用文[3]所建议的多重尺度法分析了经过修正的平面Couette流动的线性稳定性性质。在平面Couette流的分析中,用多重尺度法可以找到不稳定的Tollmien-Schlichting波,但却不能找到最不稳定的模态,通过与文[3]相比较,本文对这种方法进行了探讨。 相似文献
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Molecular dynamics simulation is applied to study the instability and rupture process of ultra-thin water films on a solid substrate.Results show the small disturbance of the film will develop linearly due to the spinodal instability,whereas the interaction between solid and liquid has less influences on the initial growth.Then the rupture occurs and the rim recedes with a dynamic contact angle.The radius of the rim varies with time as the square root of t,which is consistent with the macroscopic theory available. Stronger interaction between solid and liquid will postpone rupture time,decline the dynamic contact angle and raise the density of water near the interface between solid and liquid. 相似文献
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The molecular dynamics simulations are performed to show that in aque- ous environments, a short single-walled carbon nanotube (SWCNT) guided by a long SWCNT, either inside or outside the longer tube, is capable of moving along the nanotube axis unidirectionally in an electric field perpendicular to the carbon nanotube (CNT) axis with the linear gradient. The design suggests a new way of molecule transportation or mass delivery. To reveal the mechanism behind this phenomenon, the free energy profiles of the system are calculated by the method of the potential of mean force (PMF). 相似文献
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本文提出了经过修正的层流流动的流动稳定性理论,并在文中给出平行剪切流中平均速度的一类修正剖面,使这种理论可用于研究平行剪切流的流动稳定性,指出了流动失稳的一条新的可能途径. 相似文献
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屈曲杆大挠度弹性曲线的摄动解及其不完全分岔问题的奇异摄动解法 总被引:1,自引:0,他引:1
本文用摄动法求解了屈曲杆大挠度情况下的弹性曲线,并考虑支座处的缺陷对分岔(失稳)问题的影响,用奇异摄动的不完全分岔理论进行了计算,给出了分岔图解,并对其物理意义进行了讨论. 相似文献
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IntroductionInrecentyears,theprosperityofmetalpowdermarket[1] andthedevelopmentofsprayformingtechniquesmakeitnecessarytostudythemechanismofjetatomization .Freelyfallinghightemperaturemetalliquid ,impactedbyhighspeedgasaround ,breaksintodropletsofdifferentsizes,whichprocedureiscalledair_blastatomizationorsprayatomization .Infact,thisprocesshasawiderengineeringapplications,rangingfromfuelinjectorsingasturbinesandjetengines,totwo_phaseflowchemicalreactors ,spraydrying ,andsoon .OnthebasisofKelvi… 相似文献