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管侧冷却水在流向和横向(垂直于流向)上的分布对管壳式蒸汽冷凝器内部各物理量的分布和冷凝器的设计优化都会产生影响,因此有必要对其进行研究。该文提出了一种考虑冷却水横向分布的准三维CFD模拟算法,并基于自主开发的二维CFD冷凝过程数值计算代码ConDesign-2D对已有算例进行了模拟。结果表明,冷却水沿流向的温升不容忽略,它直接降低了换热温差,进而影响到了冷凝速率等物理量的分布,冷却水的横向分布也使得冷凝速率分布更加均匀。相比二维模拟,该算法能解析出流场在冷却水流向上的第三维分布信息,又避免了全三维模拟带来的高昂计算成本,可以应用于实际冷凝器的模拟计算。 相似文献
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顺序注射动力学分光光度法测定环境水中甲醛含量 总被引:2,自引:0,他引:2
在室温及酸性条件下,甲醛可以催化溴酸钾氧化乙基橙,使其反应褪色,据此建立了顺序注射动力学光度法测定甲醛的新方法.方法的线性范围是0.01~15mg/L,对10mg/L的标准溶液进行了9次平行测定,其相对标准偏差为0.38%,方法的检出限为0.004mg/L.应用于环境水中甲醛的测定,结果令人满意. 相似文献
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The scallop moderate longhole blasting mining method in Da Hong-shan copper mine applications accounted for more than 61% of the total amount of mining, but the large output rate restricts the mines for ore strength, The average lump ore as high as 22.7%. In order to realize the mine production efficient development, the circular moderate longhole blasting technology and field test. The test results show that circular hole blasting can reduce the block rate is reduced to 10.3%, and the traditional scallop moderate longhole blasting mining compared with the average lump ore decreased by 12.4 percentage points. The panel on duty for the day ore quantity increase 152.31t, increase rate is 51.1%. Reduces the handling of large time delay and secondary crushing of explosives and the consumption of detonators, the efficiency of drawing and at the same time, reduce the mining cost , achieved good blasting effect. 相似文献
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