Particle image velocimetry experimental investigation of header configuration on flow maldistribution in plate - fin heat exchanger 板翅式换热器封头内部流场的测量与改进研究
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In the monoblock material , black degree power is different , depth maldistribution , see more it with sapphire , white jade transition 在整块料中，墨的程度强弱不同，深浅分布不均，多见于与青玉白玉过渡。
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The flow maldistribution parameter s decreases from 1 . 210 to 0 . 209 and the ratio of the maximum velocity to the minimum decreases from 23 . 163 to 1 . 756 此研究结果对于板翅式换热器的优化设计具有重要意义。
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Second , fairness dictates that a system in which benefits and burdens are equally distributed have a mechanism designed to prevent a maldistribution in the benefits and burdens 第二，一个利益负担平等被分配的系统具有一种机制，这种机制被设计来防止利益负担的不当分配。
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It is found that the fluid flow maldistribution is very serious for conventional header while the improved header configuration with punched baffle can effectively improve the performance 实验结果表明，原始封头内部的物流分配存在严重的不均匀性，采用添加打孔挡板之后的改进型封头，流场的不均匀性有了很大的改善。
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Alone green jade : include green , sage green , aquamarine blue , yellow green , alone the jade often looks at and appraises the partner , colour maldistribution with white , many memorials tape , filiform or roll into a ball irregularly form of block distribution 绿独玉：包括绿色、灰绿色、蓝绿色、黄绿色，常与白色独玉相伴，颜色分布不均，多呈不规则带状、丝状或团块状分布。
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A mathematical model of flows in the substrate was established using the equivalent continuum approach , and multi - dimensional numerical simulation of the steady flows in the catalytic converters was performed . simulation results show that the separation and vortex , which cause the pressure loss and the velocity non - uniformity at the front of the first substrate , are generated near the wall of the conical pipe . in addition , the larger the inlet cones angle the more the pressure loss and maldistribution in converters , however , when the angle enlarges enough the pressure loss would be decrease 结果显示气流在扩张圆锥管壁附近出现分离产生较强的扰动，造成局部流动损失和载体前气流速度沿径向分布不均匀；入口扩张管结构对催化器的流动特性有很大影响，但并非扩张角越大，催化器流速武汉理工大学硕士学位论文分布的不均匀性和压力损失也增大，而是存在着一个最佳角度，但当扩张角增大到一定程度以后，扩张角对流速分布和压力损失的影响变小。
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Abstract : a mathematical model describing the effect of flow nonuniformityon the performance of compact heat exchanger is provided , which is based on that one side of heat exchanger is uniformly distributed but the other is of maldistribution . the model may be expressed in two different types , i . e . , continuous model and discrete model . the former provides a method analyzing the performance deterioration of exchanger due to flow maldistribution , and the latter provides a reference to the improvement of experimental measurement . the analyzing method obtained can be used to compute the performance deterioration of compact heat exchanger due to flow maldistribution . the result is significant to the optimization of compact heat exchanger design 文摘:以一侧流体分配不均匀的换热器模型为基础，建立了物流分配不均匀性对换热器效能影响的数学模型，通过理论分析和计算，为研究换热器内部物流分配不均匀对其效能的影响提供了一种分析方法.该理论模型包括连续模型和离散模型2种形式，前者为研究物流分配不均匀引起换热器效能的下降提供了一种分析计算方法，后者为控制实验研究的精度提供了理论依据.研究结论对换热器的优化设计具有重要意义
