Penetration height of transitional round fountains in a linearly stratified fluid
Penetration height of transitional round fountains in a linearly stratified fluid
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线性分层流体中过渡圆形喷泉的穿透高度
DOI：
10.1016/j.icheatmasstransfer.2016.12.004
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发表时间：
2017-02
影响因子：
7
通讯作者：
李明
中科院分区：
文献类型：
--
作者：
高文峰;林文贤;刘滔;Armfield S. W.;李明
由于周围流体的分层，过渡喷泉向不对称的过渡变得更加复杂。本文对线性分层流体中的圆形过渡喷泉在100 ≤Re≤ 400，1 ≤Fr≤ 8，0.0 ≤s≤ 0.3的范围内进行了一系列三维直接数值模拟，其中Fr，Reand分别为Froude，Reynolds和无量纲温度分层参数，定性和定量地研究了圆形过渡喷泉在线性分层流体中的流动特性。这些参数对它们的轴对称转变和它们的最大穿透高度的影响。结果表明，当FrorRe足够小时，喷泉始终保持轴对称;当FrorRe足够大时，喷泉开始时是轴对称的，然后变为不对称和非定常的，最后达到充分发展的准定常阶段，此时最大喷泉穿透高度在一个恒定的时间平均值上波动.结果表明，分层对稳定流动、减少甚至消除非对称性有积极作用。数值计算结果也被用来开发一系列的缩放关系，结合量纲分析得到的缩放，为初始和时间平均喷泉渗透高度，喷泉达到初始渗透高度的时间。进一步发现，一般情况下，这些特征参数对Frands有很强的依赖性，而对Re只有很弱的依赖性。
The transition to asymmetry of transitional fountains is further complicated by the stratification of the ambient fluid. In this study, a series of three-dimensional direct numerical simulations were carried out for transitional round fountains in linearly-stratified fluids over the ranges of 100 ≤Re≤ 400, 1 ≤Fr≤ 8 and 0.0 ≤s≤ 0.3, whereFr,Reandsare the Froude, Reynolds, and dimensionless temperature stratification parameters, respectively, to examine, both qualitatively and quantitatively, the effect of these parameters on their axisymmetric transition and their maximum penetration heights. The results show that whenFrorReare small enough, a fountain remains axisymmetric for all time; however, whenFrorReare increased sufficiently, the fountain will be axisymmetric initially, before becoming asymmetric and unsteady, ultimately reaching a fully developed quasi-steady stage when the maximum fountain penetration height fluctuates over a constant, time-average, value. The stratification is found to play a positive role to stabilize the flow and to reduce or even to eliminate the asymmetric behavior. The numerical results were also used to develop a series of scaling relations, in conjunction with the scalings obtained with dimensional analysis, for the initial and time-averaged fountain penetration heights, and the time for the fountain to attain the initial penetration height. It is further found that in general these characteristic parameters are strongly dependent onFrands, while only weakly dependent onRe.
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DOI：
10.1017/s0022112099006953
发表时间：
2000-01
期刊：
J.Fluid Mech.
影响因子：
--
作者：
Wenxian Lin;S.W.Armfield
通讯作者：
S.W.Armfield
分层流体中过渡平面喷泉的不对称性和穿透性
DOI：
10.1016/j.ijheatmasstransfer.2015.07.062
发表时间：
2015-11
影响因子：
5.2
作者：
Mohammad Ilias Inam;林文贤;S.W. Armfield;Yinghe He
通讯作者：
Yinghe He
影响因子：
2
作者：
W. Lin;S. Armfield
通讯作者：
W. Lin;S. Armfield
DOI：
10.1016/j.ijheatmasstransfer.2008.02.047
发表时间：
2008-10
影响因子：
5.2
作者：
Wenxian Lin;S. Armfield
通讯作者：
Wenxian Lin;S. Armfield
影响因子：
4.6
作者：
H. Burridge;A. Mistry;G. Hunt
通讯作者：
H. Burridge;A. Mistry;G. Hunt