ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
Oscillation-Induced Heat Transportation in a Curved Heat Transpotation Pipe
要約
The present paper deals with experimental and numerical study on the longitudinal heat transportation by an oscillatory water flow in a curved heat transportation tube. The heat transportation experiments were conducted for the curved tube with an inner diameter of 10 mm, and a tube length of 314 mm. The experimental apparatus mainly consisted of a test tube, hot water bath (323 K), cold water bath (293 K), and an apparatus generating the oscillatory flow. The ratio of the tube radius to the curvature radius was varied from 0.0125 to 0.075, and oscillatory flow frequency was varied from 0.5 to 2.0 Hz. As a result, the effective thermal diffusivity exhibited a peak at a curvature ratio around 0.05-0.07 and reached a value about 5 times higher than that of a straight tube. To discuss the heat transportation augmentation mechanism, the flow and temperature fields were investigated by numerical analyses. The analyses revealed that dispersive motion of fluid particles due to secondary flows plays a major role in enhancing heat transportation via curved tubes.