A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy conservation, a mathematical model describing the liquid circulation flow rate was developed, which was determined by gas vel...A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy conservation, a mathematical model describing the liquid circulation flow rate was developed, which was determined by gas velocity, the cross areas of riser and downcomer, gas hold-up and the local frictional loss coefficient. The experimental data indicate that either increase of gas flow rate or reduction of the downcomer diameter contributes to higher liquid circulation rate. The correlation between total and the local frictional loss coefficients was also established.Effects of gas flowrate in two risers and diameter of downcomer on the liquid circulation rate were examined. The value of total frictional loss coefficient was measured as a function of the cross area of downcomer and independent of the gas flow rate. The calculated results of liquid circulation rates agreed well with the experimental data with an average relative error of 9.6%.展开更多
为不断更新传统病毒进行遗传算法的进化病毒群体,提出了一种改进的周期性病毒进化遗传算法。横向上通过周期性生成病毒、周期性进行病毒感染操作,有效地增加了种群的多样性,并减少了计算工作量,提高搜索效率。纵向上对主群体采用逆二分...为不断更新传统病毒进行遗传算法的进化病毒群体,提出了一种改进的周期性病毒进化遗传算法。横向上通过周期性生成病毒、周期性进行病毒感染操作,有效地增加了种群的多样性,并减少了计算工作量,提高搜索效率。纵向上对主群体采用逆二分法选择、循环按趟交叉的机制,增强了算法的收敛性能,加快了收敛速度。将提出的改进算法用Muth and Thompson基准问题测试,显示了该算法的有效性。展开更多
基金Supported by Liaoning Provincial Natural Science Foundation(No.972050).
文摘A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy conservation, a mathematical model describing the liquid circulation flow rate was developed, which was determined by gas velocity, the cross areas of riser and downcomer, gas hold-up and the local frictional loss coefficient. The experimental data indicate that either increase of gas flow rate or reduction of the downcomer diameter contributes to higher liquid circulation rate. The correlation between total and the local frictional loss coefficients was also established.Effects of gas flowrate in two risers and diameter of downcomer on the liquid circulation rate were examined. The value of total frictional loss coefficient was measured as a function of the cross area of downcomer and independent of the gas flow rate. The calculated results of liquid circulation rates agreed well with the experimental data with an average relative error of 9.6%.
文摘为不断更新传统病毒进行遗传算法的进化病毒群体,提出了一种改进的周期性病毒进化遗传算法。横向上通过周期性生成病毒、周期性进行病毒感染操作,有效地增加了种群的多样性,并减少了计算工作量,提高搜索效率。纵向上对主群体采用逆二分法选择、循环按趟交叉的机制,增强了算法的收敛性能,加快了收敛速度。将提出的改进算法用Muth and Thompson基准问题测试,显示了该算法的有效性。
