Experimental and numerical results in closed annular space heat transfer at low temperature

✍ Scribed by D. Chatain; R. Vallcorba

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 638 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00002-7

✦ Synopsis

As part of the Laser Megajoule Facility for cryogenic targets, we have studied the heat transfer at low temperature (6 K<T<20 K) between two coaxial cylinders whose annular space was filled with helium gas. We have built a cryostat and carried out many experiments on the conduction/convection heat transfer transition in closed annular spaces. We found that gas convection begins as soon as a temperature difference exists between the two cylinders even at low pressures. Convection can generate azimuthal temperature gradients because of the non-uniform local heat transfer. The experiment is compared to numerical simulations.