Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 151-158.doi: 10.13475/j.fzxb.20201201908

• Machinery & Accessories • Previous Articles     Next Articles

Flow and heat transfer characteristics of non-uniform heat-pipe heat exchanger

QIAN Miao1,2, HU Hengdie1, XIANG Zhong1(), MA Chengzhang1, HU Xudong1   

  1. 1. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, Hangzhou, Zhejiang 310018, China
  • Received:2020-12-08 Revised:2021-09-13 Online:2021-12-15 Published:2021-12-29
  • Contact: XIANG Zhong E-mail:xz@zstu.edu.cn

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Abstract:

To reduce the flow resistance and improve the heat transfer efficiency of the heat-pipe heat exchanger, a non-uniform drop-shaped heat-pipe heat exchanger was developed. The computational fluid dynamics software ANSYS Fluent was used to simulate numerically the flow and heat transfer characteristics of the traditional staggered heat pipe arrays, drop-shaped heat-pipe arrays, and nonuniformly distributed drop-shaped heat-pipe arrays. The Nusselt numbers, friction coefficient and comprehensive index of heat transfer characteristics under different Reynolds numbers were obtained and compared with empirical formula to validate the feasibility. The results of comparative analysis show that compared with the traditional staggered heat-pipe array, the drop-shaped heat-pipe array has a larger effective heat transfer area without vortex in internal fluid flow, and it has a higher Nusselt number and a smaller friction coefficient with better comprehensive heat transfer characteristics. Moreover, the flow turbulence in the drop-shaped heat-pipe array is increased through the non-uniform design, and the Nusselt number is increased simultaneously, resulting in the increase of the heat transfer characteristics.

Key words: non-uniform heat-pipe heat exchanger, heat-pipe array, heat transfer characteristic, numerical simulation, non-uniform design, heat transfer efficiency, waste heat recovery

CLC Number: 

  • TK124

Fig.1

Structure of non-uniform drop-shaped heat-pipe heat array. (a) Three-dimensional model of non-uniform pipe diameter array; (b) Two-dimensional model of non-uniform pipe diameter structure; (c) Two-dimensional model of non-uniform distribution of tube spacing structure"

Fig.2

Local view of staggered circular heat-pipe array. (a) Small diameter; (b) Large diameter"

Fig.3

Local two-dimensional model of uniform drop-shaped heat-pipe array"

Tab.1

Structural parameters of heat-pipe array"

结构类型 宽度L/mm 长度W/mm 管径d/mm 管数N 横向间距s/mm 纵向间距t/mm
非均布
水滴形
结构		 管距非均布 480 1 000 40 61 55,80 80
60,77
65,73
管径非均布 480 1 000 44,40,36 61 70 80
47,40,33
50,40,30
均布水滴形结构 480 1 000 40 61 70 80
错排圆
形结构		 大直径 480 1 000 40 61 70 80
小直径 480 1 000 54 61 70 80

Tab.2

Thermodynamic parameters of air for simulation"

T/K Cp/
(J·kg-1·K-1)		 λ/
(W·m-1·K-1)		 η×105/
(kg·m-1·s-1)
293 1 005 0.025 9 1.81
323 1 005 0.028 3 1.96
373 1 009 0.032 1 2.19
433 1 017 0.036 4 2.45
473 1 026 0.039 3 2.60
623 1 059 0.049 1 3.14

Fig.4

Comparison of Nu and f by numerical simulation and empirical formulas"

Fig.5

Flow field diagram of small diameter circular heat-pipe array structure. (a) Cloud diagram of velocity distribution; (b) Velocity flow diagram"

Fig.6

Velocity flow diagram of droplet-shaped heat-pipe array with non-uniform pipe diameter"

Fig.7

Temperature cloud of heat-pipe array structure. (a) Small diameter circular heat-pipe array; (b) Non-uniform distributed drop-shaped heat-pipe array"

Fig.8

Heat transfer characteristic diagram of different heat-pipe array structures"

Fig.9

Heat transfer characteristics of non-uniform drop-shaped heat-pipe with different tube spacing"

Fig.10

Heat transfer characteristics of different pipe diameters with non-uniform distribution of drop-shaped heat-pipes"

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