垂直向上窄间隙矩形通道内单相传热特性实验研究

Experimental Study of Single-Phase Heat Transfer Characteristics in a Narrow Rectangular Channel with Vertical Upward Flow

以垂直向上窄间隙矩形通道为研究对象,开展了恒热流密度加热条件下的单相传热特性实验研究。根据测量的温度、流量、压降和热流密度,获得一定工况范围涵盖层流、过渡和湍流流动的平均努谢尔数实验数据,并基于实验数据对现有的预测关系式进行了对比评价。结果表明,Shah和London、Dittus-Boelter、Gnielinski提出的努谢尔数预测关系式均与实验数据具有良好的一致性,本实验得到的数据可为运动条件下的非等温传热特性研究提供对比依据。

In this paper,a vertical upward narrow gap rectangular channel is taken as the research object,and a single-phase heat transfer characteristics of constant heat flux density of heating conditions is experimentally studied.According to the measured temperature,flow rate,pressure drop and heat flux density,the experimental data of average Nusselt numbers covering laminar,transitional and turbulent flows in a certain range of working conditions are obtained,and the existing prediction correlations was compared with the experimental data obtained in this experimental study.The result shows that the relationships raised by Shah and London,Dittus-Boelter and Gnielinski have a good agreement with the experimental data.These data can provide comparison base for the study of the non-isothermal heat transfer characteristics under the motion condition.