管内微-纳多孔镀层强化R245fa垂直上升流动沸腾传热特性

doi:10.16085/j.issn.1000-6613.2023-2033

化工进展 ›› 2024, Vol. 43 ›› Issue (12): 6615-6625.DOI: 10.16085/j.issn.1000-6613.2023-2033

• 化工过程与装备 • 上一篇

管内微-纳多孔镀层强化R245fa垂直上升流动沸腾传热特性

曹泷¹^,²(), 王光辉¹, 胡春霞¹^,², 杨卧龙³, 吴学红¹^,²()

^1.郑州轻工业大学能源与动力工程学院，河南郑州 450002
^2.河南省能源高效转化与利用国际联合实验室，河南郑州 450002
^3.中国能源建设集团规划设计有限公司，北京 100120

收稿日期:2023-11-21 修回日期:2024-01-09 出版日期:2024-12-15 发布日期:2025-01-11
通讯作者: 吴学红
作者简介:曹泷（1989—），男，博士，副教授，研究方向为多相流传热传质与低品位热能利用。E-mail：caos@zzuli.edu.cn。
基金资助:
国家自然科学基金(51906231);河南省中原科技创新领军人才项目(234200510011);河南省重点研发与推广专项(232102321091);郑州轻工业大学青年骨干教师资助计划(13502010008);郑州市协同创新专项（校重大重点项目培育）(2021ZDPY0107)

R245fa vertical upward flow boiling heat transfer characteristics in enhanced tube with micro-nano porous coating

CAO Shuang¹^,²(), WANG Guanghui¹, HU Chunxia¹^,², YANG Wolong³, WU Xuehong¹^,²()

^1.College of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China
^2.Henan International Joint Laboratory of Energy Efficient Conversion and Utilization, Zhengzhou 450002, Henan, China
^3.China Energy Engineering Group Planning & Engineering Co. , Ltd. , Beijing 100120, China

Received:2023-11-21 Revised:2024-01-09 Online:2024-12-15 Published:2025-01-11
Contact: WU Xuehong

摘要/Abstract

摘要：

面向工业热能高效利用，开展了R245fa垂直上升管内沸腾流动强化传热研究。搭建了可调节角度的R245fa流动沸腾实验台，采用高速摄像机进行流型的可视化分析，并结合实验数据，分析了入口干度、热流密度以及质量流量对管内传热特性的影响。实验工况为：饱和压力0.6MPa，质量流速199.68~701.81kg/(m²·s)，热流密度4.99~74.96kW/m²，干度0.01~0.9。此外，还对光滑管与微-纳多孔镀层强化管的传热系数和摩擦压降进行了比较。强化管具有明显的强化沸腾换热的效果，其最大强化效果可以达到2.12倍。随着入口干度和热流密度的增大，换热强化因子呈先增加后降低的趋势，综合评价因子的变化趋势与换热强化因子基本一致。流型可视化对比发现，强化管壁面的强润湿性促进壁面液相吸附以及快速再润湿，其相较光滑管而言发生了更早的环状流转变。

关键词: R245fa, 强化管, 垂直向上, 流型, 传热特性

Abstract:

For the efficient utilization of of industrial waste heat, the R245fa flow boiling heat transfer characteristics was investigated experimentally in a vertically upward tube with a micro-nano porous coating. The effects of inlet vapor qualities, heat fluxes and mass fluxes on the heat transfer characteristics in the tube were analyzed, and the flow patterns were recorded by visualization. Experimental conditions were as follows: saturation pressure 0.6MPa, mass flux 199.68—701.81kg/(m²·s), heat flux 4.99—74.96kW/m², and vapor quality 0.01—0.9. In addition, the heat transfer coefficient and friction pressure drop of the bare tube and enhanced tube were compared. The enhanced tube had an obvious effect of enhancing boiling heat transfer, and the maximum heat transfer enhancement factor could reach 2.12 times. With the increasing inlet vapor qualities and heat flux, the heat transfer enhancement factor showed a trend of initially increasing and then decreasing. The variation trend of the performance evaluation parameter aligned closely with that of EF. The visualization showed that the strong wettability of the enhanced tube accelerated the diffusion of R245fa liquid on the tube wall surface and facilitated rapid rewetting. In comparison to the bare tube, the transition to annular flow occurred earlier in the enhanced tube.

Key words: R245fa, enhanced tube, vertical up, flow pattern, heat transfer characteristics

中图分类号:

TK172

曹泷, 王光辉, 胡春霞, 杨卧龙, 吴学红. 管内微-纳多孔镀层强化R245fa垂直上升流动沸腾传热特性[J]. 化工进展, 2024, 43(12): 6615-6625.

CAO Shuang, WANG Guanghui, HU Chunxia, YANG Wolong, WU Xuehong. R245fa vertical upward flow boiling heat transfer characteristics in enhanced tube with micro-nano porous coating[J]. Chemical Industry and Engineering Progress, 2024, 43(12): 6615-6625.

图/表 12

图1 强化管制备1—溶液槽；2—恒温装置；3—旋拧阀；4—过滤器；5—磁力泵；6—三通阀；7—三通；8—橡胶塞；9—烧结管；10—直流电源；11—铜棒

图2 微观形貌及表面浸润性

图3 实验系统1—储液罐；2—氮气瓶；3—过滤器；4—隔膜泵；5—旁路阀门；6—稳压罐；7—质量流量计；8—回热器；9—K型铠装热电偶；10—压力变送器；11—预热段；12—预热段直流电源；13—可视化窗口；14—实验段；15—Omega线装热电偶；16—实验段直流电源；17—冷凝器；18—冷水机组

图4 实验测试段

表1 实验主要参数

实验参数	范围
入口压力P_eva,in/MPa	0.6±0.01
热流密度q/kW·m^-2	4.99~74.96
入口干度x_in	0.01~0.9
质量流速G/kg·m^-2·s^-1	199.68~701.81

表2 主要参数、仪器最大不确定度

实验参数	设备型号	量程	精度/%	最大不确定度/%
壁温温度	GG-K-36-1000	0~260℃	±0.4	0.29
流体温度	KMQXL-040G-6	0~800℃	±0.4	3.48
压力	Rosemount-3051压力变送器	0~1MPa	±0.1	0.18
质量流量	DMF-1质量流量计	0~1000kg/h	±0.2	3.69
预热电压	HNZL可调直流稳压电源	0~24V	±0.5	1.29
实验电压	HNZL可调直流稳压电源	0~6V	±0.5	2.72
预热电流	HNZL可调直流稳压电源	0~300A	±0.5	1.41
实验电流	HNZL可调直流稳压电源	0~1000A	±0.5	3.79

图5 流型图

图6 入口干度对流动沸腾性能的影响

图7 质量流速对流动沸腾性能的影响（热流密度q=15kW/m2）

图8 热流密度对流动沸腾性能的影响[质量流速G=400kg/(m2·s)]

图9 换热强化因子和综合评价因子

图10 强化换热机理分析

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管内微-纳多孔镀层强化R245fa垂直上升流动沸腾传热特性

R245fa vertical upward flow boiling heat transfer characteristics in enhanced tube with micro-nano porous coating

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