以面向质子交换膜燃料电池电堆散热的超薄均温板为研究对象,用多孔介质传热模型、层流模型和Brinkman方程构建三维稳态数值模型,通过质量守恒确定气液界面的相变传质,研究在吸液芯饱和充液的常规工况下均温板的稳态特性。结果表明：超薄结构以及支撑柱的存在使内部压降较大;随着冷凝段对流换热系数的增大,均温性变差,内部压降也显著增大;随着热流密度的增大,温差先增大后减小,热阻持续下降;孔隙率的变化对平衡终态影响较小;渗透率的增大将极大的降低吸液芯内的液体压降,有利于相变循环。
Abstract
Taking the ultra-thin vapor chamber for heat dissipation of the proton exchange membrane fuel cell stack as the research object, a three-dimensional steady-state numerical model was constructed by using the porous medium heat transfer model, laminar flow model and Brinkman equation, and the phase change mass transfer at the gas-liquid interface was determined by mass conservation. Steady-state characteristics of the ultra-thin vapor chamber under the normal working conditions of saturated with liquid wick were studied. The results show that the ultra-thin structure and the presence of the support column make the internal pressure drop larger. With the increase of convective heat transfer coefficient in the condensing section, the temperature difference increases first and then decreases, and the internal pressure drop also increases significantly. With the increase of heat flux density, the temperature uniformity first increases and then decreases, and the thermal resistance continues to decrease. The change of porosity has little effect on the equilibrium final state. The increase in permeability will greatly reduce the liquid pressure drop in the wick, which is beneficial to phase change circulation.
关键词
质子交换膜燃料电池 /
两相流 /
传热 /
超薄均温板 /
数值分析
Key words
proton exchange membrane fuel cell /
two phase flow /
heat transfer /
ultra-thin vapor chamber /
numerical analysis
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基金
国家自然科学基金重大项目（22393954）
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