Unsteady 2D coupled heat and mass transfer in porous media with biological and chemical heat generations
Unsteady 2D coupled heat and mass transfer in porous media with biological and chemical heat generations
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多孔介质中非稳态二维耦合传热传质及生物和化学热产生
DOI：
10.1016/j.ijheatmasstransfer.2009.07.027
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发表时间：
2009
影响因子：
5.2
通讯作者：
C. Zambra
中科院分区：
文献类型：
--
作者：
N. Moraga;F. Corvalán;M. Escudey;A. Arias;C. Zambra
研究了生活污水处理厂污泥堆肥过程中二维热氧耦合扩散规律。通过有限体积法求解的不稳定的、耦合的、非线性数学模型包括由好氧细菌的作用和由多孔介质中的纤维素的氧化引起的体积生热。数值模拟允许预测的堆的形状和大小对产生的热量和氧气消耗的影响。温度和氧浓度的瞬态分布在堆肥堆不同的几何形状。热（温度）和质（氧）的传递结果表明，堆高对加热过程有重要影响，堆高小于1.7m可以避免污泥自燃。
The coupled two-dimensional heat and oxygen diffusion in a compost pile of sewage sludge obtained from domestic wastewater treatment was studied. The unsteady, coupled, non-linear mathematical model, solved through the finite volume method, includes the volumetric heat generation caused by the action of aerobic bacteria and by the oxidation of cellulose in a porous media. The numerical simulation allows the prediction for the pile shape and size effects on the heat generated and on oxygen consumption. Temperature and oxygen concentration transient distributions within compost piles are presented for different geometries. Heat (temperature) and mass transfer (oxygen) results indicate that the pile height has an important effect on the heating process and that keeping the compost pile height lower than 1.7m the self-combustion of sewage sludge can be avoided.