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收稿日期:
2024-06-17
修回日期:
2024-08-18
出版日期:
2024-09-12
通讯作者:
韩志敏
作者简介:
韩志敏(1988—),男,博士,副教授,hanzm@neepu.edu.cn
基金资助:
Zhimin HAN(), Xiangyu ZHOU, Hongyu ZHANG, Zhiming XU
Received:
2024-06-17
Revised:
2024-08-18
Online:
2024-09-12
Contact:
Zhimin HAN
摘要:
由于换热器实际的热交换过程中换热壁面并非绝对光滑,而粗糙换热壁面很容易在部分局部位置处结垢。因此本文基于已构建的局部析晶污垢模型,对不同粗糙元结构下CaCO3污垢局部沉积特性进行数值模拟研究。主要对比了三种不同形状(矩形、梯形和三角形)的粗糙元,并详细分析了三角形粗糙元的相对高度和相对宽度的影响。结果表明,三种粗糙元通道内的局部污垢热阻平均值均小于光滑通道,其中三角形粗糙元的局部污垢热阻平均值最小。三种粗糙元通道局部污垢热阻沿通道长度增加均呈周期性变化,且在每个周期内均存在峰值,其中最大峰值位于粗糙元背风侧。此外,局部污垢热阻随着三角形粗糙元相对高度的增加而减小,而随着相对宽度的增加而略有增加,说明相对高度对局部污垢沉积影响更大。
中图分类号:
韩志敏, 周相宇, 张宏宇, 徐志明. 不同粗糙元结构下CaCO3污垢局部沉积特性研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240677.
Zhimin HAN, Xiangyu ZHOU, Hongyu ZHANG, Zhiming XU. Study on local deposition characteristics of CaCO3 fouling under different roughness element structures[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240677.
结构参数 | 相对高度e/H | 相对宽度p/L |
---|---|---|
1 | 0.05 | 0.0025 |
2 | 0.15 | 0.0075 |
3 | 0.25 | 0.0125 |
4 | 0.35 | 0.0175 |
5 | 0.45 | 0.0225 |
表1 粗糙元结构参数
Table 1 Structural parameters of roughness element
结构参数 | 相对高度e/H | 相对宽度p/L |
---|---|---|
1 | 0.05 | 0.0025 |
2 | 0.15 | 0.0075 |
3 | 0.25 | 0.0125 |
4 | 0.35 | 0.0175 |
5 | 0.45 | 0.0225 |
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