化工进展2024，Vol.43Issue(12)：6615-6625,11.DOI:10.16085/j.issn.1000-6613.2023-2033
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
摘要
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.关键词
R245fa/强化管/垂直向上/流型/传热特性Key words
R245fa/enhanced tube/vertical up/flow pattern/heat transfer characteristics分类
能源科技引用本文复制引用
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):6615-6625,11.基金项目
国家自然科学基金(51906231) （51906231）
河南省中原科技创新领军人才项目(234200510011) （234200510011）
河南省重点研发与推广专项(232102321091) （232102321091）
郑州轻工业大学青年骨干教师资助计划(13502010008) （13502010008）
郑州市协同创新专项(校重大重点项目培育)(2021ZDPY0107). （校重大重点项目培育）
