Experimental and numerical analyses of natural convection flow in a partially heated vertical annulus
Experimental and numerical analyses of natural convection flow in a partially heated vertical annulus
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DOI：
10.1080/10407782.2016.1214488
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发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
S. Husain;M. Siddiqui
中科院分区：
文献类型：
--
作者：
S. Husain;M. Siddiqui
本文对竖直环形通道内的单相自然对流热诱导流动进行了实验和数值分析。实验在内部设置上进行，该内部设置具有纵横比为352的内部加热的环，热通量范围为2.5kW/m2至15 kW/m2。水被用作工作流体。数值模拟进行了计算流体动力学（CFD）模型开发使用商业软件包Ansys Fluent。本分析的结果，然后与实验数据进行比较。数值计算结果与实验结果吻合良好。给出了温度、速度和热边界层的等值线图。随着热流密度的增大，热边界层厚度减小，而热入口长度增大。热流密度的增加导致传热系数和努塞尔数的增加。
ABSTRACT Experimental and numerical analyses have been carried out for single-phase natural convection thermally induced flow in an internally heated vertical annulus. The experiments are performed on an in-house setup having an internally heated annulus of aspect ratio 352 with the heat flux ranging from 2.5 kW/m2 to 15 kW/m2. Water is used as the working fluid. The numerical simulations are carried out by a computational fluid dynamics (CFD) model developed using the commercial software package Ansys Fluent. The results of the present analysis are then compared with the experimental data. There is an excellent agreement between the numerical and the experimental results. The contour plots are presented for temperature, velocity, and thermal boundary layer. The thermal boundary layer thickness decreases while the thermal entry length increases with heat flux. An increase in the heat flux leads to the increase in the heat transfer coefficient and the Nusselt number.