Visualization Studies of Heat and Mass Transfer in Forced Flow He II

标题：强制流 He II 中传热传质的可视化研究PI：Steven W. Van Sciver，佛罗里达州立大学提案编号：CTS-0001411 摘要这项工作涉及应用流可视化和粒子图像测速 (PIV) 技术来研究 He II 中的传热传质。 目的是获得研究 He II 中微观尺度热流体问题的能力，以便该流体可以更好地在应用中用作冷却剂。这项工作将首先集中于将合适的中性密度颗粒引入 He II 逆流/强制流动通道实验中的技术。待研究的中性颗粒包括固体 H2/D2 和空心玻璃微球。 一旦开发出粒子播种技术，PIV 实验将研究 He II 通道的微观流体动力学。实验将在配备光学通道的低温恒温器中进行。 如果成功，这将是 He II 中 PIV 的首次演示，也是逆流或强制流 He II 中唯一的粒子成像研究。 这也将清楚地表明 PIV 对于低温热流体研究的价值。

Title: Visualization Studies of Heat and Mass Transfer in Forced Flow He IIPI: Steven W. Van Sciver, Florida State UniversityProposal Number: CTS-0001411AbstractThis work involves the application of flow visualization and particle image velocimetry (PIV) techniques to studies of heat and mass transfer in He II. The purpose is to obtain the capability to investigate microscopic scale thermal fluid issues in He II, so that the fluid can be better utilized as a coolant in applications. The effort will first focus on techniques to introduce suitable neutral density particles into experiments with a He II counterflow/forced flow channel. Neutral particles to be investigated include solid H2/D2 and hollow glass microspheres. Once particle seeding techniques have been developed, PIV experiments will investigate the microscale fluid dynamics of the He II channel. The experiments will be performed in a cryostat equipped with optical access. If successful, this will be the first demonstration of PIV in He II and the only particle imaging study in counterflow or forced flow He II. It will also be a clear indication of the value of PIV for cryogenic thermal fluid studies.