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为了讨论含湿量对固结多孔介质传热的影响,利用试验设备,对混凝土等级为C30的有限长度圆柱体,一端施以循环温度边界条件,一端施以恒定温度边界条件,设计了圆柱体内为干燥(s=0)、含湿(s=0.33)和饱和(s=1)情况,在2个循环周期内,分别测试了等间距圆柱体内12组瞬时温度值,分析了湿度变化对于循环温度边界条件下有限长度固结多孔介质体内的温度波动影响。试验表明:在干燥和饱和情况下,沿着圆柱轴向深度,各层的温度均响应为同样的周期性波动,其频率与边界面处温度的频率相等;且它们之间均存在一定的延迟,其相位相应滞后;随着深度的增加,其波幅不断衰减;但是对于含湿情况下其频率降低,波长增大。在计算非饱和多孔介质的传热传质时,必须考虑水的相变作用。
In order to discuss the influence of moisture content on the heat transfer of consolidated porous media, a finite length cylinder of concrete grade C30 was applied with test equipment, with one end of the cycle temperature boundary conditions and one end of the cylinder with constant temperature boundary conditions. Twelve sets of instantaneous temperature values were measured in two equally spaced cylinders for dry (s = 0), wet (s = 0.33) and saturated (s = 1) conditions, respectively. Temperature Fluctuations in Finite Length Conformal Porous Media Under Temperature Boundary Conditions. The experimental results show that the temperature of each layer responds to the same periodic fluctuation along the axial depth of the cylinder under the dry and saturated conditions, and its frequency is equal to the frequency of the temperature at the boundary surface; and there is a certain delay between them , Its phase lag correspondingly; With the increase of depth, its amplitude decay unceasingly; However, its frequency decreases and its wavelength increases when it is wet. In calculating the heat and mass transfer of unsaturated porous media, the phase transition of water must be considered.