石油化工2025，Vol.54Issue(6)：810-818,9.DOI:10.3969/j.issn.1000-8144.2025.06.008
不同齿形结构水平管内换热及压降特性研究
Heat transfer and pressure drop characteristics of different tooth profiles in horizontal tubes
摘要
Abstract
Four different types of tested tubes with internal threads were investigated,and the influence of geometric parameters such as the helix angle,tooth height,and tooth angle on evaporation heat transfer was analyzed.The mechanism by which different tooth shapes affect the pressure drop inside the tube was clarified,and the common heat transfer correlations for smooth and enhanced tubes were validated.The experimental results indicate that prior to the dryout of tested tubes,the heat transfer coefficient and pressure drop go up with the increase of mass flow rate and outlet vapor quality of refrigerants.During dryout,the heat transfer coefficient drops sharply,while the pressure drop remains relatively unchanged.The boiling heat transfer coefficient and pressure drop of the enhanced tubes are 20.4％-117.2％and 20.2％-118.4％higher,respectively,than those of smooth tubes.Larger helix angles enhance the swirling effect of fluids.A smaller tooth apex angle results in larger inter-tooth spaces,while an increase in the number of teeth expands the heat transfer area.Larger tooth height contributes to an increased expansion ratio of the internal surface area,intensifying fluid disturbance and mixing within the tube and leading to the increased heat transfer coefficient and pressure drop.When the heat transfer coefficient per unit pressure drop is compared among the tested tubes,the 18° threaded tube exhibits the best overall performance.Although a 28° helical angle enhances heat transfer,it significantly increases the pressure drop,thereby elevating the economic costs of practical applications.The simulation results demonstrate that the Tran correlation shows an average absolute error of 16.7％for smooth tubes.The Gungor-Winterton and Kaew-on predictive models have average absolute errors of 18.4％ and 18.6％,respectively,for enhanced tubes.关键词
齿形结构/流动沸腾换热/压降/换热关联式Key words
tooth profile structure/flow boiling heat transfer/pressure drop/heat transfer correlation分类
化学化工引用本文复制引用
陈浩南,黄理浩,陶乐仁,张青..不同齿形结构水平管内换热及压降特性研究[J].石油化工,2025,54(6):810-818,9.基金项目
国家自然科学基金项目(52006147) （52006147）
上海市动力工程多相流动与传热重点实验室项目(13DZ2260900). （13DZ2260900）
