FLOW DISTRIBUTION AND PRESSURE-DROP IN PLATE HEAT-EXCHANGERS .2. Z-TYPE ARRANGEMENT
FLOW DISTRIBUTION AND PRESSURE-DROP IN PLATE HEAT-EXCHANGERS .2. Z-TYPE ARRANGEMENT
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DOI：
10.1016/0009-2509(84)80177-3
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发表时间：
1984-01-01
影响因子：
4.7
通讯作者：
MARTIN, H
中科院分区：
文献类型：
--
作者：
BASSIOUNY, MK;MARTIN, H
为了研究z型板式换热器的流量分布和压降，对进气和排气管道中一个流动元件的质量和动量平衡进行了理论分析。基于一维流动方程进行了计算。发现流动分布和压降可以由一个通用的特征参数(m)来决定。当mis = 0时，可以得到近似均匀的流动分布。当m_2为正时，通道流速沿进气流方向增大。如果m2为负，通道流速也会在进气流方向上增加。分析还表明，u型板式换热器和z型板式换热器的总压降几乎相同。结果适用于各种各样的热交换器尺寸，通道几何和流体速度的组合。它们通过图表进行总结，从而使设计师能够快速评估流模式。
To investigate the flow distribution and the pressure drop in theZ-type arrangement plate heat exchangers, a theoretical analysis has been made including mass and momentum balances for a flow element in both the intake and exhaust conduits. Calculations based on one-dimensional flow equations have been carried out.It is found that the flow distribution and the pressure drop can be determined by a general characteristic parameter (m). Nearly uniform flow distribution may be obtained whenmis equal to zero. In the case whenm2is positive, the channel flow rates will increase in the direction of the intake stream. Ifm2is negative the channel flow rates will also increase in the intake stream direction. The analysis also shows that the total pressure drop in plate heat exchangers is practically the same for bothU- andZ-type arrangements. The results are applicable to a wide variety of combinations of heat exchanger dimensions, channel goemetries and fluid velocity. They are summarized by charts that permit a designer quickly to estimate the flow patterns.