Cooling and slowing in high-pressure jet expansions
Cooling and slowing in high-pressure jet expansions
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高压射流膨胀的冷却和减慢
DOI：
10.1103/physreva.77.012702
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发表时间：
2008
影响因子：
2.9
通讯作者：
K. Rademann
中科院分区：
文献类型：
--
作者：
W. Christen;K. Rademann
将理想气体超声速光束中平均流动速度的数学术语扩展到包括实际气体性质。在最近的自由射流膨胀实验中观察到，这一过程得出了流速与压力的明确关系。应用于略高于临界点的停滞条件，该模型表明，种子高压射流膨胀可能适用于以最高效率减慢几乎任何分子。此外，我们讨论了速度比S=v0 / v对碰撞冷却的压力相关流速v0的影响，并建议使用速度扩展v作为高压射流膨胀中平移温度的更明确的测量。
The mathematical term for the mean flow velocity in supersonic beams of ideal gases is extended to include real gas properties. This procedure yields an explicit dependence of the flow velocity on pressure, as observed in recent experiments of free jet expansions. Applied to stagnation conditions slightly above the critical point, the model suggests that seeded high-pressure jet expansions might be suitable for slowing down virtually any molecule with maximum efficiency. Moreover, we discuss the consequence of a pressure-dependent flow velocity v0 for the speed ratio S=v0 / v with respect to collisional cooling and suggest to use the velocity spread v as a more nonambiguous measure of translational temperature in high-pressure jet expansions.