Heat transfer and pressure drop characteristics inside stainless steel three-dimensional enhanced tubes

doi:10.11949/j.issn.0438-1157.20181081

CIESC Journal ›› 2018, Vol. 69 ›› Issue (S2): 45-54.DOI: 10.11949/j.issn.0438-1157.20181081

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Heat transfer and pressure drop characteristics inside stainless steel three-dimensional enhanced tubes

SUN Zhichuan¹, LI Wei^1,2, YAN Xiaolong¹, MA Xiang², CHEN Wei², JIN Chunhua³, WU Jie¹

1 College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2 Institute of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China;
3 Wuxi Jialong Heat Exchanger Stock Co. Ltd., Wuxi 214092, Jiangsu, China

Received:2018-09-26 Revised:2018-10-15 Online:2018-12-31 Published:2018-12-31
Supported by:
supported by the National Natural Science Foundation of China (51506104).

不锈钢三维强化管内的换热和压降特性

孙志传¹, 李蔚^1,2, 闫晓龙¹, 马祥², 陈伟², 金春花³, 吴杰¹

1 浙江大学能源工程学院, 浙江杭州 310027;
2 青岛科技大学机电工程学院, 山东青岛 266061;
3 无锡佳龙换热器股份有限公司, 江苏无锡 214092

通讯作者: 李蔚
基金资助:
国家自然科学基金项目（51506104）。

Abstract

Abstract:

Heat transfer and pressure drop characteristics of refrigerant R410A inside three horizontal enhanced tubes (EHT) and one smooth tube were investigated experimentally. All stainless steel two-side enhanced tubes were fabricated using a multiple high-pressured extruding process. These three-dimensional two-layer surface structures are composed of staggered dimpled protrusions or boat-shaped cavities and petal-shaped background patterns in a grid-like arrangement. According to the single-phase heat balance analysis, the proportion of heat loss in total heat is no more than 5% for the entire test range. Changing the water flow rate in the case where the refrigerant mass flow rate was maintained at a fixed value, the water-side heat transfer coefficients for each tube tested were obtained by the Wilson plot method. On basis of the thermal resistance model, it was found that 1EHT-1 exhibits the best single-phase heat transfer performance, followed by the 3EHT and 1EHT-2. A large difference between the experimental results of these evaporation and condensation tests was observed in the three enhanced tubes. It can be attributed to the effect of low thermal conductivity of stainless steel on the temperature distribution in the region of protrusions/cavities.

摘要：

采用实验方法对比制冷剂R410A在3根强化管和1根光滑管内的换热和压降特性。所有的三维双侧强化管均通过高压分层轧制制成，其立体化内表面结构分别是旋涡状凸起和船型凹坑与花瓣纹背景图案的叠加。通过热平衡分析，实验热损失小于5%。保持制冷剂侧流量不变的情况下，改变水侧的质量流率，可以通过Wilson图解法计算每个管型的水侧传热系数。经热阻模型计算，1EHT-1的管内单相换热性能最佳，3EHT次之，1EHT-2最弱。3根强化管的蒸发和冷凝换热实验结果差距较大，不锈钢的低热导率对凸起/凹坑区域的温度分布影响是主要原因。

CLC Number:

TU111

SUN Zhichuan, LI Wei, YAN Xiaolong, MA Xiang, CHEN Wei, JIN Chunhua, WU Jie. Heat transfer and pressure drop characteristics inside stainless steel three-dimensional enhanced tubes[J]. CIESC Journal, 2018, 69(S2): 45-54.

孙志传, 李蔚, 闫晓龙, 马祥, 陈伟, 金春花, 吴杰. 不锈钢三维强化管内的换热和压降特性[J]. 化工学报, 2018, 69(S2): 45-54.

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Heat transfer and pressure drop characteristics inside stainless steel three-dimensional enhanced tubes

不锈钢三维强化管内的换热和压降特性

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