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

被引：0
|
作者：
Sun Z. [1 ]
Li W. [1 ,2 ]
Yan X. [1 ]
Ma X. [2 ]
Chen W. [2 ]
Jin C. [3 ]
Wu J. [1 ]
机构：
[1] College of Energy Engineering, Zhejiang University, Hangzhou, 310027, Zhejiang
[2] Institute of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, Shandong
[3] Wuxi Jialong Heat Exchanger Stock Co. Ltd., Wuxi, 214092, Jiangsu
来源：
Huagong Xuebao/CIESC Journal | 2018年 / 69卷
关键词：
Convection; Heat transfer; Stainless steel tube; Three-dimensional enhanced tube; Two-phase flow; Wilson plot;
D O I：
10.11949/j.issn.0438-1157.20181081
中图分类号：
学科分类号：
摘要：
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. © All Right Reserved.
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页码：45 / 54
页数：9
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共 31 条
  • [1] Yu J., Koyama S., Condensation heat transfer of pure refrigerants in microfin tubes, British Journal of Haematology, 139, 1, pp. 281-288, (1998)
  • [2] Nozu S., Katayama H., Nakata H., Et al., Condensation of refrigerant CFC11 in horizontal microfin tubes: proposal of a correlation equation for frictional pressure gradient, Experimental Thermal and Fluid Science, 18, 1, pp. 82-96, (1998)
  • [3] Nozu S., Honda H., Condensation of refrigerants in horizontal, spirally grooved microfin tubes: numerical analysis of heat transfer in the annular flow regime, Journal of Heat Transfer-Transactions of the ASME, 112, 1, pp. 80-91, (2000)
  • [4] Kedzierski M.A., Goncalves J.M., Horizontal convective condensation of alternative refrigerants within a micro-fin tube, Journal of Enhanced Heat Transfer, 6, 2, pp. 161-178, (1999)
  • [5] Wang H.S., Honda H., Nozu S., Modified theoretical models of film condensation in horizontal microfin tubes, International Journal of Heat and Mass Transfer, 45, 7, pp. 1513-1523, (2002)
  • [6] Cavallini A., Col D.D., Mancin S., Et al., Condensation of pure and near-azeotropic refrigerants in microfin tubes: a new computa-tional procedure, International Journal of Refrigeration, 32, 1, pp. 162-174, (2009)
  • [7] Zhao A.G., Zhang A.F., Guo R.H., Et al., Experimental study on heat transfer performance of dimple-texture tube, Refrigeration and Air-conditioning, 18, 4, pp. 80-84, (2018)
  • [8] Liang Z., Xie S., Zhang L., Et al., Influence of geometric parameters on the thermal hydraulic performance of an ellipsoidal protruded enhanced tube, Numerical Heat Transfer Part A-Applications, 72, 2, pp. 153-170, (2017)
  • [9] Kumar P., Kumar A., Chamoli S., Et al., Experimental investigation of heat transfer enhancement and fluid flow characteristics in a protruded surface heat exchanger tube, Experimental Thermal and Fluid Science, 71, pp. 42-51, (2016)
  • [10] Li M., Khan T.S., Hajri E.A., Et al., Geometric optimization for thermal-hydraulic performance of dimpled enhanced tubes for single phase flow, Applied Thermal Engineering, 103, pp. 639-650, (2016)
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