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首页> 外文会议>55th International Astronautical Congress 2004 vol.8 >TECHNICAL ASPECTS OF LIQUID DIFF USION MODEL EXPERIMENTS
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TECHNICAL ASPECTS OF LIQUID DIFF USION MODEL EXPERIMENTS

机译：液体扩散模型实验的技术方面

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In liquid diffusion experiments, the fundamental problem is to avoid additional transport induced by natural convection inside the liquid caused by densty gradients. One possibility to reduce additional transport is to perform experiments under microgravity conditions in orbit. Nevertheless, residual acceleration inside the spacecraft disturb these measurements. The influence of this disturbance on liquid metal diffusion experiments was investigated on the space station MIR with the MIM facility. Model experiments were carried out during two Parabolic Flight Campaigns to validate the influence of vibration on the measurement of diffusion coefficient. Instead of a chemical gradient in a metallic melt, a temperature gradient in wateristhe analogous driving force. These model experiments used the shear cell technique to bring the two different liquid columns in oontact. During the parabolic flight campaigns several effects caused by shearing were noticed which influenced also the diffusion measurements itself. Especially, directly after the contact of the columns a quick jet flow is developed possibly by pressure differenoes in the two liquid columns. This plume superimposed in the first 4 seconds the temperature signal, afterwards an evaluation of the experiments showed a good quantitative agreement with the expected curves Ground experiments did not show this effect in this magnitude. This presentation will show the influence of the shearing process by both temperature measurements and video analysis Additionally, another technique to perform diffusion experiments was investigated on ground and will be discussed. The Rowing-Junction cell, which is also proofed in space for diffusion measurements on molten salts, is going to be adapted as model experiment under reduced gravity.
机译：在液体扩散实验中，基本问题是要避免由液体梯度引起的自然对流引起的额外传输。减少额外运输的一种可能性是在微重力条件下在轨道上进行实验。然而，航天器内部的残余加速度会干扰这些测量。在带有MIM设施的空间站MIR上研究了这种干扰对液态金属扩散实验的影响。在两次抛物线飞行运动中进行了模型实验，以验证振动对扩散系数测量的影响。代替金属熔体中的化学梯度，水中的温度梯度是类似的驱动力。这些模型实验使用剪切池技术将两个不同的液柱保持原样。在抛物线飞行运动中，注意到由剪切引起的几种影响，这些影响也影响了扩散测量本身。特别是，在两柱接触之后，可能立即通过两个液柱中的压力差产生快速的射流。在最初的4秒钟内，该羽流叠加了温度信号，随后对实验的评估显示出与预期曲线的良好定量一致性。地面实验并未显示出这种程度的影响。该演示将通过温度测量和视频分析显示剪切过程的影响。此外，在地面上研究了另一种进行扩散实验的技术并将进行讨论。划船结单元也已在太空中证明可用于熔融盐的扩散测量，将在降低重力的情况下用作模型实验。

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