Characteristics of turbulent velocity and temperature in a wall channel of a heated rod bundle
Characteristics of turbulent velocity and temperature in a wall channel of a heated rod bundle
复制标题
DOI：
10.1016/0894-1777(95)00076-3
复制
发表时间：
1996-01-01
影响因子：
3.2
通讯作者：
Meyer, L
中科院分区：
文献类型：
--
作者：
Krauss, T;Meyer, L
研究了37棒束（P/D = 1.12，W/D = 1.06）加热棒束壁面子通道内的湍流空气流动。用具有X线和温度线的热线探针进行测量。测量了平均速度、平均流体温度、壁面剪应力和壁面温度以及湍流动能、雷诺应力和湍流热通量等湍流量，并结合壁通道中的等温流动和加热流动的数据进行了讨论。同一棒束的中心通道。此外，速度和温度波动的功率谱密度的数据。这些数据表明，在两个相邻的棒之间或棒与壁之间的差距区域中存在大尺度的速度和温度的周期性波动。这些波动是负责高子通道间的热量和动量交换。
Turbulent air flow in a wall subchannel of a heated 37-rod bundle (P/D = 1.12, W/D = 1.06) was investigated. Measurements were performed with a hot-wire probe with x-wires and a temperature wire. The mean velocity, mean fluid temperature, wall shear stress and wall temperature, turbulent quantities such as the turbulent kinetic energy, Reynolds stresses, and turbulent heat fluxes were measured and are discussed with respect to data from isothermal flow in a wall channel and heated flow in a central channel of the same rod bundle. Also, data on the power spectral densities of the velocity and temperature fluctuations are presented. These data show the existence of large-scale periodic fluctuations of velocity and temperature in the gap region between two adjacent rods or between rods and the wall. These fluctuations are responsible for the high intersubchannel heat and momentum exchange.