| 摘要: |
| 在Re = 4800~10200范围内，实验研究了矩形通道内圆管侧后方两排三角小翼V形阵列布置的强化换热特性，比较了三角小翼V形阵列布置和单排大三角小翼布置的换热差异，研究了攻角、翼高和排列间距对换热的影响。结果表明：三角小翼V形阵列的Nu数比单排大三角小翼平均增加4.9%，且随着阵列中翼片前后排间距的增加，换热呈增强趋势。对于三角小翼V形阵列和单排大三角小翼，随着小翼攻角的增加，通道换热先增加后减小，最佳攻角均为α=60°，随着小翼翼高的增加，通道换热单调增加。实验数据拟合得到了V形三角小翼阵列和单排大三角小翼的Nu数无量纲关联式，为管翅式换热器中三角小翼的布置提供了依据和参考。 |
| 关键词: 管翅式换热器 强化传热 纵向涡 实验研究 |
| DOI： |
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| 基金项目:国家自然科学基金（51106041）资助项目。 |
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| Experimental Study on Heat Transfer Characteristics of the Delta Winglets with V-shaped Array |
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Tian Liting, Gao Yongkun, Wang Jiali, Min Chunhua, Yang Li
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| (School of Energy and Environmental Engineering, Hebei University of Technology) |
| Abstract: |
| In the range of Re = 4800~10200, the experiment was made to investigate the heat transfer characteristics of two rows of the delta winglets arrayed in V shape at the back side of the round tube in the rectangular channel. The heat transfer enhancement was compared between the delta winglets with V-shaped array and the single-row large delta winglets, and the effects of attack angle of delta winglet, winglet height and spacing of winglet array were examined. Results show that Nu of the delta winglets with V-shaped array is 4.9% higher than that of the single-row large delta winglets, and the heat transfer in the channel has an increasing trend with the increase of the spacing in winglet array. For the delta winglets with V-shaped array and the single-row large delta winglets, with increasing the attack angle of the delta winglet, the heat transfer enhancement increases firstly and then decreases, and the optimal attack angle is α=60°, while the heat transfer enhancement in both layouts monotonically increases with the increase of the winglet height. The correlations of Nu for the delta winglets with V-shaped array and the single-row large delta winglets are respectively derived by the regression analysis of experimental data. These correlations can be referred for the arrangement of the delta winglets in the fin-and-tube heat exchanger. |
| Key words: fin-and-tube heat exchanger heat transfer enhancement longitudinal vortex experimental study |
