Tracing Thermal Creep and Thermophoresis in Porous Structures at Low Ambient Pressure and Low Gravity

Schywek Mathias; Teiser Jens; Wurm Gerhard

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Tracing Thermal Creep and Thermophoresis in Porous Structures at Low Ambient Pressure and Low Gravity

机译：在低环境压力和低重力下跟踪多孔结构中的热蠕变和热泳

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We carried out two types of drop tower experiments to quantify gas and particle motion induced by temperature gradients inside a porous structure in a low pressure environment. In one setup 400 mu m sized particles were traced inside heated channels at pressures of a few Pascal. Their motion is consistent with pure thermophoresis. In the second setup tracer particles were used to track the thermal creep gas flow through a porous dust bed. Here, the flow was traced outside of the dust bed and without thermophoretic motion. The results are consistent with a simple capillary model of the dust bed.

机译：我们进行了两种类型的滴塔实验，以量化在低压环境下多孔结构内部温度梯度引起的气体和颗粒运动。在一种设置中，在几帕斯卡的压力下，在加热的通道内跟踪了400微米大小的颗粒。它们的运动与纯热泳一致。在第二种设置中，使用示踪剂颗粒跟踪通过多孔粉尘床的热蠕变气流。在此，气流被追踪到尘埃床的外部，并且没有热泳运动。结果与粉尘床的简单毛细管模型一致。

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来源
《Microgravity science and technology》 |2017年第6期|485-491|共7页
作者
Schywek Mathias; Teiser Jens; Wurm Gerhard;
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作者单位

Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47048 Duisburg, Germany;

Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47048 Duisburg, Germany;

Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47048 Duisburg, Germany;

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正文语种 eng
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关键词
Thermophoresis; Thermal creep;

机译：热泳;热蠕变;

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Tracing Thermal Creep and Thermophoresis in Porous Structures at Low Ambient Pressure and Low Gravity

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