The abstraction of elements from soil water by plant roots can have a marked effect on chemical reaction rates . 植物根系從土壤水中攝取養(yǎng)分元素能對化學(xué)反應(yīng)速率產(chǎn)生顯著的影響。
The intrinsic chemical reaction rate constant was insensitive to the precursor and the calcinations history of cao , but the product layer diffusivity was affected by these two factors in the initial stage and decreased to a constant value with increasing conversion of cao 化學(xué)反應(yīng)速率常數(shù)不受氧化鈣的先驅(qū)物與其鍛燒程序所影響,但產(chǎn)物層擴散系數(shù)在初始階段則受到上述兩因素的影響,并隨著氧化鈣的轉(zhuǎn)化而減少至一定值。
As to the simulation , three - dimensional n - s equations and two - phase flow model , in which the liquid toluene spray as discrete particles was considered , were employed to describe the turbulent combustion processes in the combustion chamber . the mass and energy transfer between the two phases were calculated by the droplet evaporation model , and the arrehnius model was used to obtain the gas chemical reaction rate . the details of 3d flow field , the distributions of temperature and compounds were obtained by solving the equations 數(shù)值仿真方面,應(yīng)用三維湍流n - s方程以及顆粒軌道模型描述了激光器燃燒室內(nèi)部的噴霧兩相燃燒流動過程,兩相之間的質(zhì)量、能量交換由液滴蒸發(fā)模型計算,氣相化學(xué)反應(yīng)速率由arrhnius公式計算,通過耦合求解氣液兩相模型方程,模擬了燃燒室三維流場,得到了燃燒室內(nèi)的溫度和組分濃度分布。
The two - dimensional body - fitted grid was created by method of partial differential equation and zonal method . the k - equation subgrid - scale model was used to simulate the turbulent viscosity , the chemical reaction rate was determined by the subgrid ebu combustion model and the heat flux model was employed for the heat flux 運用偏微分方程和區(qū)域法生成二維貼體網(wǎng)格,湍流模型采用k方程亞網(wǎng)格尺度模型,燃燒模型采用亞網(wǎng)格ebu燃燒模型,采用熱通量輻射模型估算輻射通量。