科研之友
微信
新浪微博
Facebook
分享链接
摘要
The performance of the microgrooved heat pipe is greatly affected by the capillary limit. Changing surface properties of the microgroove and using a new fluid working medium to increase the wetting length are effective methods to solve this problem. Based on the accommodation theory, this paper develops a theoretical model to predict the nanofluid wetting length in rectangular microgrooves. Results suggest that the wetting length of the SiO2 nanofluid in the superhydrophilic microgroove was significantly longer than that of the pristine microgroove because of the effect of the contact angle. In superhydrophilic microgroove, the wetting length was mainly affected by surface tension, so the accommodation wetting length La and the corner flow wetting length Lc declined with the decrease of the nanoparticle size and the increase of the volume fraction. In pristine microgroove, the influence of contact angle on La was greater than surface tension, so La rose with the decrease of the nanoparticle size and the increase of the volume fraction.
- 单位
