In this experimental and numerical investigation, the use of circular cross sectioned ring-type flow turbulators was considered as a method to increase local heat transfer coefficients in annular heat transfer passages. Experimental data was obtained for cases with and without ring turbulators within a horizontal annular test section using water for average Reynolds numbers ranging from 2000 to 7500, and average Prandtl numbers ranging from 6.73 to 6.79. The test section was heated uniformly on the inner annular wall and had a hydraulic diameter of 14.8 mm, a diameter ratio (inner wall diameter to outer wall diameter) of 0.648, and a length to hydraulic diameter ratio of approximately 71. A set of turbulators were inserted which had a thickness of 1 mm, a ring diameter of 15.1 mm and a pitch of 50 mm. Local heat transfer coefficients were obtained using liquid crystal thermography to map the effects of adding the set of ring turbulators. This method provided results which could be used to compare the turbulator effects between turbulators. It was found that the presence of the flow turbulators increased the average Nusselt number by between 34% and 54%. The experimental tests were followed by numerical simulations to identify the response in the heat transfer coefficient by changing the geometry of the turbulators. For this, the turbulator diameters were ranged from 0.5 mm to 2 mm, and the gap size (between the inner wall and a turbulator ring) ranged from 0.125 mm to 4 mm at a pitch of 50 mm. The results showed that the use of turbulators can significantly increase the Nusselt number. Heat transfer was optimised in terms of the turbulator diameter and the wall gap size. From the numeric determined pressure drop values it was found that the smaller gap size had the lowest pressure drop and the smallest turbulators also produced the lowest pressure drop.

在这个实验和数值研究中，使用圆形横截面的环形流动湍流器被认为是一种增加环形传热通道局部传热系数的方法。对于在平均雷诺数范围为 2000 至 7500 和平均普朗特数范围为 6.73 至 6.79 的情况下，使用水在水平环形测试段内有和没有环形湍流器的情况下获得了实验数据。试验段在内环壁上均匀受热，水力直径为14.8mm，直径比（内壁直径与外壁直径）为0.648，长度与水力直径比约为71。 一组湍流器插入厚度为1mm，环直径为15.1mm，节距为50mm的孔。局部传热系数是使用液晶热成像法获得的，以绘制添加一组环形湍流器的效果。该方法提供的结果可用于比较湍流器之间的湍流器效应。发现流动湍流器的存在使平均努塞尔数增加了 34% 到 54%。实验测试之后是数值模拟，以通过改变湍流器的几何形状来确定传热系数的响应。为此，扰流器直径在0.5mm至2mm的范围内，并且间隙尺寸（内壁与扰动环之间的间隙）以50mm的间距在0.125mm至4mm的范围内。结果表明，使用湍流器可以显着增加努塞尔数。在湍流器直径和壁间隙尺寸方面对传热进行了优化。从数值确定的压降值发现，较小的间隙尺寸具有最低的压降，并且最小的湍流器也产生最低的压降。