非均布热管换热器的流动及其传热性能

doi:10.13475/j.fzxb.20201201908

纺织学报 ›› 2021, Vol. 42 ›› Issue (12): 151-158.doi: 10.13475/j.fzxb.20201201908

非均布热管换热器的流动及其传热性能

钱淼¹^,², 胡恒蝶¹, 向忠¹(), 马成章¹, 胡旭东¹

1.浙江理工大学机械与自动控制学院, 浙江杭州 310018
2.浙江省先进制造技术重点实验室, 浙江杭州 310018

收稿日期:2020-12-08 修回日期:2021-09-13 出版日期:2021-12-15 发布日期:2021-12-29
通讯作者: 向忠
作者简介:钱淼(1987—),男,副教授,博士。主要研究方向为纺织印染相关技术及其机电装备开发。
基金资助:
浙江省基础公益研究计划项目(LGG18E050022);国家自然科学基金项目(62173307);浙江省重点研发计划项目(2019C01027)

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

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

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 Published:2021-12-15 Online:2021-12-29
Contact: XIANG Zhong

摘要/Abstract

摘要：

为降低热管换热器的流动阻力并增强其换热效率,提出一种水滴形非均布热管换热器结构。使用计算流体力学软件ANSYS Fluent对传统错排热管阵列、水滴形热管阵列及非均布水滴形热管阵列的换热性能展开数值模拟,得到了其在不同雷诺数下的努塞尔数、阻力系数以及综合换热性能指标的变化曲线。对比分析结果表明:相对于传统错排热管阵列,水滴形热管阵列有效传热面积较大,内部流体流动无涡出现,流动摩擦较小,具有更大的努塞尔数以及更小的阻力系数,综合换热性能指标更佳;通过非均布设计,水滴形热管阵列内的流动紊流度增加,努塞尔数变大,换热性能增加。

关键词: 非均布热管换热器, 热管阵列, 传热性能, 数值模拟, 非均布设计, 换热效率, 余热回收

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

中图分类号:

TK124

钱淼, 胡恒蝶, 向忠, 马成章, 胡旭东. 非均布热管换热器的流动及其传热性能[J]. 纺织学报, 2021, 42(12): 151-158.

QIAN Miao, HU Hengdie, XIANG Zhong, MA Chengzhang, HU Xudong. Flow and heat transfer characteristics of non-uniform heat-pipe heat exchanger[J]. Journal of Textile Research, 2021, 42(12): 151-158.

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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
错排圆形结构	小直径	480	1 000	54	61	70	80

T/K	C_p/ (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

非均布热管换热器的流动及其传热性能

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

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