CAJ | 학술논문

建立了燕尾形轴向微槽热管传热和液体流动模型并进行了数值求解,计算了其最大传热能力.模型考虑了气液界面剪切力的作用,分析了热管内气、液相流体压力和流速及弯月面毛细半径沿轴向的变化特性,并讨论了热负荷对蒸发段端口毛细半径的影响,以及工作温度和吸液芯结构对最大传热能力的影响.研究表明:弯月面毛细半径沿轴向非线性增加,在蒸发段和绝热段变化较小,而从冷凝段开始急剧上升;热管内蒸气沿程压差远小于液相压差;液体的平均速度远小于蒸气的平均速度;沟槽热管的最大传热能力受工作温度和毛细芯结构尺寸的影响较大;燕尾形底宽的增大或微槽高度的增加有利于提高热管的最大传热能力,而蒸气腔半径对最大传热能力的影响不明显.同时,还通过实验验证了本模型的正确性.
건립료연미형축향미조열관전열화액체류동모형병진행료수치구해,계산료기최대전열능력.모형고필료기액계면전절력적작용,분석료열관내기、액상류체압력화류속급만월면모세반경연축향적변화특성,병토론료열부하대증발단단구모세반경적영향,이급공작온도화흡액심결구대최대전열능력적영향.연구표명:만월면모세반경연축향비선성증가,재증발단화절열단변화교소,이종냉응단개시급극상승;열관내증기연정압차원소우액상압차;액체적평균속도원소우증기적평균속도;구조열관적최대전열능력수공작온도화모세심결구척촌적영향교대;연미형저관적증대혹미조고도적증가유리우제고열관적최대전열능력,이증기강반경대최대전열능력적영향불명현.동시,환통과실험험증료본모형적정학성.
A theoretical model for flowing and heat transfer in a heat pipe with axially swallow-tailed microgrooves are devel-oped and calculated numerically to propose the maximum heat transport capability. In the model, the effect of the liquid-vapor in-tertacial shear stress is included. The axially variation of pressure and velocity both in the liquid phase and vapor phase is ana-lyzed. And the effect of the heat load on the meniscus radius at the end cap of evaporation section is discussed as well as the effect of working temperature and cross section structure of the wick on the maximum heat transfer capability. It is indicated thai the me-nilus radius increases non-linearly ,along the axial direction. At the evaporator and adiabatic section, it will increase slowly, while it begies to increase drastically at the beginning of the condenser section. The pressure difference in the vapor phase along the axi-ally direction is much smaller than what in the liquid phase, however, the average velocity of the liquid is much larger than what of the vapor. In addition, it is confirmed the maximum heat transport capability is deeply affected by the working temperature and the size of the wick. A groove wick structure with a wider bottom width or higher grtx,ve height will enhance the heat transfer capa-bility, while the influence of vapor core size is less obvious. And the accuracy of the model is also verified by the experiment.