Abstract
Critical heat fluxes (CHFs) were measured on single same sized flat plate heaters located at one end of six rectangular ducts with different cross-sectional areas in subcooled He II for bulk liquid temperature range of 1.8 to 2.1 K at atmospheric pressure in order to clarify the heat flow in a He II contained duct with a sudden change in its cross-sectional area. One side of the test plate was attached to the end plate of the duct made of Fiber-Reinforced Plastics (FRP), and the other end of the duct was opened to pressurized He II. The ratio of the cross-sectional duct area to the heater area was varied from 1.0 to 3.5. The CHFs increased with the increase in the ratio and approached a constant value: the CHF on the same sized flat plate in a pool of He II without duct. A CHF correlation can express the experimental data within 20 % error.KeywordsFlat PlateCritical Heat FluxRectangular DuctHeater AreaTransient Heat TransferThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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