Dewar to dewar model for superfluid helium transfer

✍ Scribed by H.A. Snyder

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 346 KB
• Volume: 28
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(88)90051-3

✦ Synopsis

A model has been developed to pred=ct the flow of He II between a source and a rece)vmg dewar The model uses a fimte d=fference approx=mat=on to integrate the descnbmg equat=ons The transfer path may conta)n porous plugs or mechamcal pumps, heater sect)ons, heat leaks, constr=ct=ons due to valves, and bends These hne elements may occur m any order and )n any quantity The hne elements are easdy reconfigured by changing the input data The input consmts of the number of f)n)te element cells, the pressure )n each dewar, the heat input to each sect=on and the d)mens=ons of each sect=on The output )s the temperature, pressure, flow rate, veloc=t=es and heat flux m each sect=on An internal reference table prov=des the propertms of He II The model ~s programmed for a LOTUS work sheet It converges rap=dly and usually requires 10 to 15 =terat=ons For most apphcat)ons an =terat=on takes 30 s on an AT The pred=ctlons agree well w=th expenmental data Keywords hel,um; helium transfer, space cryogen,cs