Fluid flow and heat transfer of natural convection adjacent to upward‐facing inclined heated plates
Fluid flow and heat transfer of natural convection adjacent to upward‐facing inclined heated plates
复制标题
向上倾斜加热板附近自然对流的流体流动和传热
DOI：
10.1002/htj.10091
复制
发表时间：
2000
影响因子：
1.7
通讯作者：
T. Asami
中科院分区：
文献类型：
--
作者：
F. Kimura;K. Kitamura;M. Yamaguchi;T. Asami
通过实验研究了自然对流绕上倾斜板的湍流转变机理和局部换热特性。实验的修正局部瑞利数范围为10~8×10~(14)，倾角θ范围为0~90°。用染料和液晶测温仪显示了平板上的流场和平板表面的温度。结果表明，纵向涡在θ<；72°平板上的湍流转变中起主要作用。这些旋涡首先出现在层流边界层中，然后从平板上分离出来，最后变得扭曲。结果表明，旋涡的剥离和扭曲对换热有显著的强化作用。测量了层流区、过渡区和湍流区的局部换热系数。结果表明，湍流区的系数趋于一致，且与倾角无关。《威利期刊》，32(3)：278-291,2003；在线发表在《威利国际科学》(www.intercience.wiley.com)上。DOI 10.1002/htj.10091
Turbulent transition mechanism and local heat transfer characteristics of the natural convective flows over upward-facing inclined plates were investigated experimentally. The experiments were performed in the range of modified local Rayleigh numbers from 104 to 8 × 1014 and of inclination angles θ from 0 to 90°. The flow fields over the plate and the surface temperatures of the plate were visualized with dye and liquid crystal thermometry. The results showed that longitudinal vortices play a main role in the turbulent transition over the plate of θ < 72°. These vortices appear first in the laminar boundary layer, then detach from the plate and, finally become distorted. It is found that the heat transfer is enhanced markedly by the detachment and the distortion of these vortices. The local heat transfer coefficients were measured in the laminar, transitional, and turbulent regions. The results show that the coefficients in the turbulent region become identical and independent of inclination angles. © 2003 Wiley Periodicals, Inc. Heat Trans Asian Res, 32(3): 278–291, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/htj.10091