Results of a numerical study of the flow structure and turbulent heat transfer in a round tube with a mounted single diaphragm with height h and some clearance c between the tube and the diaphragm. The size of the clearance between the diaphragm and the tube wall was varied within range A = c/h = 0 – 0.33. It was determined that an increase in the gap between the diaphragm and the tube wall alters the structure of the recirculation region and eliminate the stagnation zones in the region of secondary vortex. The flow regime, when the values of average heat transfer behind the diaphragm in the presence of a clearance exceed those for the attached rib, was distinguished. When increasing the gap height from A = 0 to 0.33, the thermal enhancement factor increases by 30%.
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机译：圆形管的流动结构和湍流传热的数值研究结果，该圆形管安装了单个膜片，高度为h，管与膜片之间的间隙为c。隔膜和管壁之间的间隙尺寸在A = c / h = 0 – 0.33的范围内变化。已经确定，隔膜和管壁之间的间隙的增加改变了再循环区域的结构并消除了次级涡旋区域中的停滞区域。当存在间隙时，膜片后的平均传热值超过所连接肋的平均传热值时，区分流动状态。当间隙高度从A = 0增加到0.33时，热增强因子增加30％。
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