Abstract

A study of the heat transfer, critical heat fluxes, and dynamics of vapor formation during boiling of liquid nitrogen at pressures of 0.1 and 0.018 MPa under conditions of stationary heat release has been carried out. A smooth copper plate and plates with capillary-porous coatings with various structural parameters, produced by additive 3D printing (Selective Laser Melting/Sintering), were used as test sections. The presence of the coatings has been shown to lead to substantial enhancement of heat transfer in comparison with the smooth section. High-speed video recording of boiling was carried out, on the basis of which experimental data on the bubble departure diameters were obtained, and qualitative assessment of the density of active nucleation sites for the investigated types of heaters was carried out.

中文翻译：

---

选择性激光熔化/烧结 (SLM/SLS) 多孔涂层上氮池沸腾过程中的传热增强

摘要

已经进行了在固定放热条件下，在 0.1 和 0.018 MPa 压力下液氮沸腾过程中的传热、临界热通量和蒸汽形成动力学的研究。通过增材 3D 打印（选择性激光熔化/烧结）生产的光滑铜板和具有各种结构参数的毛细孔涂层板被用作测试部分。与光滑部分相比，涂层的存在已被证明导致传热显着增强。对沸腾进行高速视频记录，在此基础上获得气泡离开直径的实验数据，并对所研究类型的加热器的活性成核位点密度进行定性评估。