河北科技大学学报2018，Vol.39Issue(3)：261-267,7.DOI:10.7535/hbkd.2018yx03010
扭曲椭圆管内超临界CO2冷却换热的数值模拟
Numerical simulation of cooling heat transfer of supercritical carbon dioxide in twisted elliptical tubes
摘要
Abstract
In order to enhance the heat transfer performance of CO2heat pump,based on the numerical simulation method of Fluent,the law of supercritical CO2cooling and heat transfer characteristics and secondary flow in the horizontal elliptical tube whose torque is 100 mm or one infinity number under different mass flow are studied.In addition,concerning part coefficient of heat transfer and pressure drop brought by vertical elliptical tube,the influence of the length of the axial ratio b/a and the torque on the heat transfer performance is studied.Simulation results show that,the effect of buoyancy on the twisted elliptical tube is significantly larger than that of elliptical tube under low mass flow,and for the elliptical tube when supercritical CO2is under the low mass flow G<200 kg/(m2·s2),the elliptical tube has a greater intensity of secondary flow caused by buoyan-cy,and the enhanced heat transfer is more pronounced;when supercritical CO2is under the high mass flow G>200 kg/(m2·s2), the twisted elliptical tube has a greater intensity of periodic secondary flow caused by self-structure,and the enhanced heat transfer is more pronounced;the heat transfer coefficient and pressure drop increase with the increasing degree of twist and flattening.It provides important theory and data support for the application of the twisted elliptical tube in CO2heat pump.关键词
工程热力学/Fluent/超临界CO2/椭圆管/换热特性/二次流Key words
engineering thermodynamics/Fluent/supercritical CO2/elliptical tube/heat transfer performance/secondary flow分类
通用工业技术引用本文复制引用
崔海亭,易长乐,刘思文..扭曲椭圆管内超临界CO2冷却换热的数值模拟[J].河北科技大学学报,2018,39(3):261-267,7.基金项目
河北省自然科学基金(E2014208005) （E2014208005）
河北省高等学校科学技术研究项目(ZD2018079) （ZD2018079）
