Rayleigh number

It is found that the growth rate of perturbation in linear stage is function of relative Rayleigh number r.

发现扰动的线性阶段成长率是相对瑞利数r的函数。

Specially it is not obvious under lower Rayleigh number effect , and under high Ra number , the natural convection heat transfer in the enclosure is stronger .

特别的，在低瑞利数下增强效果不明显；在高瑞利数下，腔体内自然对流换热增强较显著。

An Experimental Study for High Rayleigh Number Flow Pattern in a Building Interior Space

高Ra数条件下室内自然对流形态的实验研究

The influence of Rayleigh number on the stream field and temperature field is discussed .

讨论了雷利数对流场和温度场的影响。

A experimental study of natural convective heat transfer of air in vertical annular on the high Rayleigh number condition

高Rayleigh数条件下竖圆环夹层内自然对流换热的实验研究

The critical Rayleigh number is regarded as a function of time and is expanded in series of a small parameter .

nard对流，文中将临界Rayleigh数当作时间的函数，并将其按小参数展开成级数。

The heat transfer coefficient rises with Reynolds number , and varies slightly with the increase of Rayleigh number .

反映在无量纲参数上，随着进口雷诺数的提高，盘腔内的换热增强；

According to the curves of local and average heat transfer coefficients , the effect of Rayleigh number and aspect ratio was studied .

在对局部和平均换热系数分析的基础上，整理了瑞利数Ra.L和高宽比H/L对平均换热系数的影响。

For different Rayleigh number and temperature difference ratio , the overall heat transfer rates and the portion of radiation present different variation patterns .

不同Rayleigh数和温差比下，空腔的总换热率及辐射所占份额均呈现不同的变化规律。

The recirculation cavity flows caused by temperature difference are simulated , and the relations between the flow patterns and the Rayleigh number are analyzed .

对由温差引起的空腔流动进行了模拟，分析了流动特性与雷利数的关系。

Experimental data for natural convection heat transfer from a horizontal cylinder in the Rayleigh number range higher than 2 × 107 have been obtained in this paper .

本文充实了Ra数高于2×107范围内横圆柱外自然对流换热的实验数据。

In the present paper , using linear stability analysis , in the Boussinesq approximation , we studied the effect of magnetic field on the critical Rayleigh number Re .

对处在磁场中的薄层流体在Boussinesq近似下，用线性稳定性分析的方法，讨论了磁场中临界Rayleigh数Rc的影响。

The effects of unstable flow and various forces on heat transfer were studied , and the heat transfer coefficient variations with Reynolds number and Rayleigh number were calculated .

主要讨论了流动对换热的作用以及旋转系下各力对换热的影响，给出了盘腔内的换热随各无量纲参数的变化规律。

The upwind difference method is used in convective term and the finite element method is used in other term in order to simulate the flow at high Reynolds number and high Rayleigh number .

对流项采用迎风差分格式，其余的计算均采用四边形单元的有限元法，适应了高Reynolds数及高Raylaigh数的要求，对复杂流动域具有很灵活的适应性。

It is found that Rayleigh number has great effects on the patterns and velocities of thermal free convection and controls the relative ratio of hot and cold plume in the shell .

瑞利数的大小对自由热对流的格局和速率产生了重要的影响，控制着对流层中高温热柱区和低温冷柱区的相对大小。

It is also found that the critical Rayleigh number Rac changes with slot widths , and there exists symmetrical and unsymmetrical oscillation for the oscillatory flow and heat transfer .

数值实验还表明，流动和换热出现振荡时的临界Rayleigh数Rac与开缝圆的开缝度有关，且流动和换热的振荡会出现对称振荡和非对称振荡两种情形。

Results are presented for Rayleigh number in the range of 10 4 to 10 6.The computation result and predictor test show that this procedure can fully reflect conjugate conduction with natural convection in enclosure .

具体分析了瑞利数变化范围为104到106时建筑围护结构传热对室内自然对流的影响.数值预测结果表明：该方法能够真实反映室内自然对流问题。

With the Double-Grid Method , several different difference schemes , those are conservative / nonconpervative central difference and conservative / nonconservative upwind difference , are used to calculate the numerical solutions under different Rayleigh Number ( Ra ) .

分别利用守恒和非守恒型的中心差分格式及守恒和非守恒型的上风差分格式，同时采用两层网格方法，得出了不同Rayleigh数下的数值结果。

Through this experiment , it is obviously showed that the flow in the body cavity became more intensified as Rayleigh number increased . And the porous media parameters such as porosity and the placement of the porous media thin layer had a direct effect on the velocity distribution .

实验结果表明：腔体内的流动随瑞利数Ra的增大而增强，多孔介质参数及多孔介质不同的分布对腔体内的流场有直接的影响。

Rayleigh wave has a number of important features , it is of significant interest in earthquake engineering , geophysics , geotechnical engineering and other fields .

Rayleigh波具有许多重要的特性，在地球物理学，地震工程，和岩土工程等领域有着重要的价值。

The comparison of the calculated formation processes of localized traveling wave for two Rayleigh numbers shows that the stability of localized traveling wave depends on Raleigh number , and the width of the localized wave in the interval of stable increases with Rayleigh number .

两个Rayleigh数的局部行进波形成过程的计算比较说明局部行进波的稳定性依赖于Rayleigh数的大小。在稳定区间内局部行进波的宽度随Rayleigh数的增加而增加。