Heat transfer in a horizontal channel containing two-phase He II

✍ Scribed by J Panek; S.W Van Sciver

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 434 KB
• Volume: 39
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(99)00081-8

✦ Synopsis

We report on heat transport in horizontal two-phase He II and vapor in a 2 m long test section with a 3 mm wide by 65 mm tall cross section. Liquid and vapor temperatures are measured at eight locations, six along the channel and two in the boundary reservoirs. The six measurements along the channel are at three equally spaced axial locations, each with one thermometer in the liquid and one in the vapor. Boundary temperatures selected are 1.4, 1.8, and 2.0 K and with up to 20 mK temperature dierence across the channel. The liquid level at the cold end of the channel is set at 60, 50, or 40 mm, and the warm end level is lower due to increased vapor pressure. The eect of bellows pumps forcing up to 0.66 g/s of liquid with or against the temperature gradient is also investigated.

A ®nite dierence numerical model is constructed which solves the main governing nonlinear ordinary dierential equation for energy transport in strati®ed two-phase He II. Agreement between the model and experiment is good if one assumes a certain reasonable value for parasitic heat load to the experiment.