发表机构
Service de Physique de l'Etat Condensé, CEA, CNRS, Université Paris-Saclay（凝聚态物理服务处，法国原子能和替代能源委员会，法国国家科学研究中心，巴黎萨克雷大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过数值模拟探究气泡成核对脉动热管性能的影响，发现热阻随成核过热度变化存在最小值，源于运行模式转变，并绘制了模式图。
AI 中文摘要
在本研究中，我们讨论了使用内部开发的脉动热管（PHP）数值模拟代码CASCO（法语缩写，意为高级脉动热管模拟代码）所获得的结果。目的是研究气泡生成（沸腾）对高回路数脉动热管（10回路水-铜管式脉动热管，蒸发器区域各回路独立加热）已建立振荡的影响。我们改变成核势垒值，即发生成核时的局部过热度ΔTnucl，以及热负荷Pe；其他模拟参数保持不变。脉动热管的传热性能通过热阻Rth来评估，分别在水平方向和垂直方向（有利方向）下进行。由于气泡生成对脉动热管运行起积极作用，预期Rth(ΔTnucl)函数单调增加。对于高ΔTnucl确实如此。对于低ΔTnucl，Rth(ΔTnucl)函数递减，因此出现最小值。这是由于稳定运行模式之间的转变所致。这些模式在液体塞进入蒸发器的平均穿透深度上差异显著。对于水平脉动热管，这些模式分别对应间歇振荡和连续振荡。我们讨论了这些模式，并获得了以Pe-ΔTnucl为坐标的模式图。
英文摘要
In this communication, we discuss results obtained with the numerical in-house PHP simulation code CASCO (French abbreviation for Advanced PHP simulation code). The aim is to study the impact of bubble generation (boiling) on the established oscillation of a PHP with a high turn number (10-turn water-copper tubular PHP with independently heated turns in the evaporator region). We vary the nucleation barrier value, i.e. the local superheating $Δ$Tnucl at which the nucleation occurs and the heat load Pe; other simulation parameters are kept constant. The PHP heat transfer performance is evaluated with the PHP thermal resistance Rth for both horizontal and vertical favorable PHP orientation. Since the bubble generation plays a positive role for the PHP functioning, one expects that the function Rth($Δ$Tnucl) monotonously increases. This is true for high $Δ$Tnucl. For small $Δ$Tnucl, the Rth($Δ$Tnucl) function is decreasing, thus a minimum occurs. It appears because of a transition between the regimes of stable PHP functioning. The regimes strongly differ by the average penetration of liquid plugs into the evaporator. For horizontal PHP, these regimes correspond to the intermittent and continuous oscillations. The regimes are discussed and the regime map in the coordinates Pe -$Δ$Tnucl is obtained.
Journal refInternational Symposium on Oscillating/Pulsating Heat Pipes (ISOPHP 2019), Sep 2019, Daejeon, South Korea
