泡沫镍板冷却特性的实验研究及数值模拟

doi:10.11949/j.issn.0438-1157.20180888

摘要/Abstract

摘要：

以泡沫镍板为研究对象，采用实验与数值分析方法，研究了泡沫镍板在冷却过程的基本特性。实验结果表明，在泡沫镍板生产线正常运行期间，整个冷却过程可视为稳态过程，镍板各部分温度基本保持不变。较大温度梯度主要集中在两处，第一是还原性气体入口处，第二是高温水冷段的前半段。数值分析表明，改变镍板的运动速度时，第一温度梯度随着镍板运动速度的增加而增加，第二温度梯度随着速度的增加而减少，二者出现的位置也相应变化；改变高温水冷段水温时，水温升高引起第二温度梯度减小，对其他位置的温度场影响较小。

关键词: 泡沫金属, 流固耦合, 实验, 数值仿真

Abstract:

In this paper, the cooling characteristics of foam nickel plate in the cooling section of the production line are studied by means of experiment and numerical analyses. Experimental results show that during the normal operation progress, the temperature of the entire foam nickel plate remains basically unchanged. The maximum temperature gradients are located at two positions, one is the entrance of the reducing gas and the other is in the first half of the high temperature water cooling section. If changing the movement velocity of the nickel plate, the first temperature gradient becomes larger together with the larger movement velocity of the nickel plate and the second temperature gradient decreases with the increase of movement velocity, and the corresponding positions are also changed. If changing the temperature of the high temperature water, the higher the water temperature, the smaller the temperature gradient in the second place, and the other temperature distribution is less affected.

Key words: porous metal, fluid-solid coupling, experiment, numerical simulation

中图分类号:

TK 124

田亚晓, 王乃用, 李常兴, 杜文静. 泡沫镍板冷却特性的实验研究及数值模拟[J]. 化工学报, 2019, 70(S1): 79-85.

Yaxiao TIAN, Naiyong WANG, Changxing LI, Wenjing DU. Experimental and numerical study of cooling characteristics of foam nickel plate[J]. CIESC Journal, 2019, 70(S1): 79-85.

图/表 11

图1 冷却段示意图

Fig.1 Cooling section diagram

表1 实验用仪器

Table 1 Experimental instrument

设备名称	量程	精确度
HT-127温度传感器	0~1200℃	±1℃
Pt100温度传感器	0~450℃	±0.1℃
红外线测温仪	-30~60℃	±1℃

图2 实验测量现场图

Fig.2 Experimental measurement picture

图3 温度测量结果

Fig.3 Temperature measurements

图4 几何模型及网格划分

Fig.4 Geometric and meshing

表2 材料的热物性参数

Table 2 Thermal physical properties parameters

名称	密度ρ/（kg/m³）	比热容c_p/(J/(kg·K))	热导率λ/ (W·(m·K))
石棉	140	1220	0.045
泡沫镍	268.2	463	0.2
Q235	7858	502.45	10
氢气	0.08189	14.3	0.1672

图5 泡沫镍最大温度梯度随网格数量变化

Fig.5 Maximum temperature gradient of nickel foam variation with grid quantity

图6 泡沫镍整体温度分布特征

Fig.6 Characteristics of whole temperature distribution

图7 泡沫镍板的局部温度云图

Fig.7 Local temperature distributions of foam nickel plate/℃

图8 泡沫镍运动速度对冷却特性的影响

Fig.8 Influence of velocity on cooling characteristics

图9 冷却温度对温度梯度影响

Fig.9 Influence of cooling temperature on temperature gradient

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