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过冷下降液膜破裂的分析 总被引:2,自引:0,他引:2
用简化的横向形变模型和干斑模型对过冷受热下降液膜的破裂进行分析 ,取消了膜内温度为线性分布的假设 ,考虑了壁面尺度和液固配合的影响 ,提出了形变区长度和破裂膜厚的表达式 ,讨论了分析的合理性 相似文献
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本文采用保角变换将两个平行偏心的等温圆柱面之间的稳态导热变换为同心同轴的圆柱面之间的导热,得到稳态导热情况下偏心圆筒壁、两平行圆柱面以及地下埋管与地面之间等三种实际情况下的导热形状因子,为简化热流量计算提供方便,为对其机理的认识拓展新思路. 相似文献
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考虑表面蒸发压力和热毛细力作用情况下,对饱和蒸发状态下低雷诺数自由降落液膜在小波幅正弦型波纹壁面上的流动进行理论分析。对控制微分方程及边界条件进行量纲一化并引入流函数,对微分方程及边界条件进行摄动展开,得到了这种情况下液膜流动的简化分析模型,求出了近似解析解。讨论了壁面波纹、表面张力、蒸发压力、热毛细力对液膜流动的影响。研究表明:液膜的波动幅度随蒸发强度和热毛细力的增大而增大;液膜波动与壁面波纹的相位差随蒸发强度增大而增大,随热毛细力增大而减小。 相似文献
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The title compound (C6N3H18)2Ti4O4(C2O4)7(4H2O 1 (C13H22N3O18Ti2, Mr = 604.14) was synthesized by the reaction of Ti(SO4)2, H2C2O4(2H2O and N-(2-ammonioethyl)- piperazinium (AEPP) in aqueous solution. The single-crystal X-ray analysis has revealed that 1 crystallizes in the triclinic system, space group Pī with a = 9.1437(6), b = 11.4991(10), c = 11.6975(8)A, α = 96.2915(18), β = 107.998(3), γ = 104.276(4)°, V = 1110.35(14)A3, Z = 2, Dc = 1.807 g/cm3, F(000) = 618, μ = 0.815 mm-1, the final R = 0.0463 and wR = 0.1264 for 3718 observed reflections with I > 2σ(I). X-ray crystal-structure analysis suggests that compound 1 consists of [Ti4O4(C2O4)7]6- anion and two protonated N-(2-ammonioethyl)piperazinium cations. The anions are linked into an infinite chain through Ti4O4(C2O4)8 by sharing the oxalates as bridging ligands. 相似文献
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