High Reynolds Number Flows Using Liquid and Gaseous Helium: by Russell J. Donnelly (auth.), Russell J. Donnelly (eds.)

By Russell J. Donnelly (auth.), Russell J. Donnelly (eds.)

Liquid helium has been studied for its intrinsic curiosity via a lot of the twentieth century. long ago decade, a lot has been realized approximately warmth move in liquid helium as a result of have to cool superconducting magnets and different units. the subject of the 7th Oregon convention on Low Temperature Physics was once an utilized one, particularly using liquid and gaseous helium to generate excessive Reynolds quantity flows. The low kinematic viscosity of liquid helium instantly makes excessive Reynolds numbers obtainable and the query addressed during this convention was once to discover quite a few probabilities to work out what useful units may be outfitted utilizing liquid or gaseous helium. there are many chances: development of a wind tunnel utilizing severe helium fuel, loose floor trying out, low pace movement amenities utilizing helium I and helium ll. on the time of the convention, so much attention were given to the final threat since it appeared either attainable and worthy to construct a stream facility which can succeed in exceptional Reynolds numbers. any such gadget will be priceless in natural examine for learning turbulence, and in utilized study for checking out versions a lot as is finished in a water tunnel. on the way to research those chances intimately, we invited a variety of specialists to Eugene in October 1989 to offer papers all alone specialties and to hear displays at the liquid helium proposals.

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High Reynolds Number Flows Using Liquid and Gaseous Helium: Discussion of Liquid and Gaseous Helium as Test Fluids

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Application of a temperature gradient is bound to superimpose a counterflow. All of this needs to be understood. There is an interesting parallel to vortex coupled superfluidity when the height d of a convecting layer of a dilute solution of 3He in superfluid 4He is much greater than a characteristic dissipation length A. 5. (Metcalfe and Behringer, 1990). 6. Historical Notes on Superfluid Wind Tunnels Helium was first liquefied in 1908 and by the 1930s efforts were being made in Leiden, Cambridge and Toronto to measure the viscosity.

The experiments and from the day-to-day operation of the low-speed tunnel. Operational • Cooling with LN2 is practical. - Rapid cooldown The Biggest. ' Viehweger and his co-workers at the DLR Research Center at Porz-Wahn Table 1 Low-speed Cryogenic Tunnel Results modified a large low-speed tunnel for cryogenic operation. The project started Type ................................................................ closed circuit, fan in 1978 with studies of how to modify an Material of construction ..............................

The tunnel is Fan speed ...................................................... 0 -1750 rpm the European Transonic Windtunnel Table 6 UIUC Cryogenic Heat Transfer Tunnel (ETW). The countries funding the ETW are France, the Federal Republic of Type .................................................................. closed circuit, fan Germany, the Netherlands, and the United Material of construction ................................ stainless steel Kingdom. They expect the ETW to meet Insulation ........................................................

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