内螺纹管对流传热特性研究  

Study on convective heat transfer characteristics of internally ribbed tubes

作　　者：张定才[1] 朱春洁[1] 张振[1] 杜佳迪[1] 

机构地区：[1]中原工学院

出　　处：《制冷与空调》2014年第8期25-29,共5页Refrigeration and Air-Conditioning

基　　金：河南省高等学校青年骨干教师资助计划(2011GGJS-114);河南省教育厅自然科学基金项目(2009A470009)

摘　　要：为考核内螺纹管阻力系数与对流表面传热系数之间的依变关系,对6根内螺纹管在管内水流速1.0-3.5 m/s范围内进行加热或冷却试验,采用Wilson试验法获得管内对流表面传热系数。基于相同质量流量的评价指标（Nu/Nup）/（f/fp）,流体被加热工况接近1,流体被冷却工况在1.2左右,对Gnielinski推广公式作出合理修正。将修正的Gnielinski推广公式的预测结果与6根内螺纹管试验结果进行对比,125组试验数据中90%的数据两者偏差在±10%以内。In order to verify the changing relation of internally ribbed tube＇s convective heat transfer coefficient with its resistance coefficient,the experimental studies of heating or cooling are conducted on 6 internally ribbed tubes while the water-side velocity ranges from1.0to 3.5 m/s.Wilson plot technique is used to obtain the convective heat transfer coefficients.With the same mass flow,the evaluation index（Nu/Nup）/（f/fp）is close to 1under the heating mode and it is about 1.2 under cooling mode.So the correction is made for the extension of Gnielinski equation.The prediction results calculated by the modified extension of Gnielinski equation are compared with 125 groups of test results on 6 internally ribbed tubes.It is found that 90%of the compared data＇s deviations are within10%.

关 键 词：内螺纹管 对流传热 阻力系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]