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首页> 外文期刊>Journal of Fluid Mechanics >Double-diffusive transport in laboratory thermohaline staircases
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Double-diffusive transport in laboratory thermohaline staircases

机译：实验室热盐梯中的双扩散运输

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Laboratory experiments were conducted on a double-diffusing fluid stabilized by the faster diffuser (T) and destabilized by the slower diffuser (S), the arrangement that leads to salt fingering. The experiments were conducted in three tanks of depths 2 m, 1 m or 0.3 m, with initial linear profiles of S and T between two reservoirs at fixed or known values, S-0 + DeltaS, T-0 + DeltaT in the top reservoir, S-0, T-0 in the bottom reservoir. In the thermohaline staircase regime consisting of an alternating stack of convecting layers and finger layers, the overall fluxes F-S and F-T are clearly not depth independent. The overall Nusselt number, N-S varies inversely with the number n of finger layers plus convecting layers occurring in the experimental fluid. The largest Nusselt number occurs for n = 1. The number n increases with increasing mean vertical gradient, up to a point. If the vertical gradients are large, n is always equal to 1. Internal measurements show that in the Rayleigh number range R-S similar to 10(15) and density ratio ran e Rrho similar to 1.1 to 1.2, the finger flux F-S(f) similar to (deltaS/h)(RSRrhob)-R-a with a = 0.18 to 0.19 and b = 1.8 to 2.1. The data show dependence of F-S(f) on finger layer thickness h. S In the convecting layers, N-S(e) proportional to R-0.21 for large enough aspect ratio. [References: 18]
机译：在由快速扩散器（T）稳定并由较慢扩散器（S）不稳定的双扩散流体上进行了实验室实验，这种布置会导致盐析。实验是在三个深度为2 m，1 m或0.3 m的储罐中进行的，两个储层之间的S和T的初始线性分布处于固定或已知值，顶部储层中的S-0 + DeltaS，T-0 + DeltaT ，S-0，T-0位于底部水库。在由对流层和指状层交替堆叠组成的热盐阶梯法中，总通量F-S和F-T显然与深度无关。总努塞尔数N-S与指状层数加上实验流体中对流层的数目n成反比。当n = 1时，出现最大的Nusselt数。n随平均垂直梯度的增加而增加，直至一个点。如果垂直梯度很大，则n始终等于1。内部测量表明，在瑞利数范围 RS 类似于10（15），密度比ran e Rrho类似于1.1至1.2，手指通量FS（f ）类似于（deltaS / h）（RSRrhob）-Ra，其中a = 0.18至0.19，b = 1.8至2.1。数据显示F-S（f）对指状层厚度h的依赖性。 S在对流层中，对于足够大的纵横比，N-S（e）与R-0.21成比例。 [参考：18]

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