Thermomechanical flow of He II through a porous element for a fountain effect pump

✍ Scribed by M Murakami; T Hanyu

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 737 KB
• Volume: 32
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(92)90056-g

✦ Synopsis

The thermomechanical flow of He II through a porous element for a fountain effect pump was experimentally investigated to understand the general flow characteristics in both ideal and turbulent flow states. The flow rate increases in proportion to the heat input Q in the ideal superfluid flow state for small Q, but it tends to saturate for further increases of Q in the superfluid turbulent state, and finally reaches a maximum at the He II temperature in the downstream region just below Tx. The flow in the latter state is found to be well formulated in terms of the Gorter -Mellink mutual friction term if it is modified to take account of the interior structure for flow passages in an element. The modified formulation clearly models the existence of the maximum flow rate and a geometrical similarity law for the flow rate. A computer simulation was also successfully attempted to predict the flow characteristics through a fountain effect pump element.