Study of Flow and Heat Transfer Characteristics of non-periodical attack angle in Narrow Rectangular Channel with Longitudinal Vortex generators
The heat transfer enhancement of Longitudinal Vortex (LV) is a kind of technology with good efficiency and low resistance. LV is produced by Longitudinal Vortex Generators (LVGs) mounted on the heated surface. With relative long influence distance and simple structure, the LVGs can be used in narrow channels with flat surface. The dimension of narrow rectangular channel is 600 mm (length)×40 mm (width)×3 mm (gap width), the single rectangular block LVGs is laid out in one heated plate. The dimension of LVGs is as follows: height is 1.8 mm, width is 2.2 mm, length is 14 mm, transverse distance is 4 mm, and longitudinal distance is 150mm. The attack angle of LVGs is very important to extend this kind of technology in narrow rectangular channel with water medium. In previous study, the attack angle of LVGs of periodicity mounted was discussed and the optimal value was 44. In this paper, the attack angle of the first and the second LVG are changed and the others keep 44°. Study of flow and heat transfer characteristic of non-periodicity attack angle is completed. The result shows that with the change of attack angle of the first and the second LVGs, the heat transfer enhancement of water medium is advantageous. This conclusion should be extended when the working medium is vapor-liquid two-phase. The results of this calculate method are compared with the experimental results of thermal infrared imager and phase doppler particle analyzer, and they are reasonable. FLUENT6.2 is used to simulate this question, and three velocity components of water flow have been used to define residual intensity ratio of LV.
Longitudinal Vortex Generator Narrow Rectangular Channel Heat Transfer Enhancement non-periodicity
L.Wang J.Huang
School of Civil Engineering and City Construction, Southwest University of Science and Technology, M National Key Laboratory of Bubble Physics and Natural Circulation, Nuclear Power Institute of China,
国际会议
西安
英文
513-518
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）