摘要
通过设计和搭建水在逆流薄膜填料上流动的可视化实验台以及填料的湿重实验台,研究了8种逆流填料上水在某平均风速及不同流速下的扩散角、滞留时间,以及不同淋水密度下的水膜重量,用来预判填料的散热性能的优劣。扩散角、滞留时间与成型片的表面形状及亲疏水性有关,扩散角大、滞留时间长,预示填料的散热性能会好,而水膜重量越大,则表明水再填料表面的分布越好。但并不是水膜重量越大,其换热效果最好,这要结合扩散角度和滞留时间一起来判断换热性能的优劣。实验表明,3号和5号逆流填料表面的滞留时间最长,5号为多折斜波填料,因此示踪剂随水膜在填料表面的滞留较长,但5号填料扩散角明显小于3号逆流填料,且3号单位体积逆流填料的水膜重量最大,这与平面接触角及平面滞水时间的实验结论相吻合,预判3号填料的热性能最好。
Through the design and construction of a visualized flow test bed for water flow on counter-flow filler and a wet weight test bed for fillers,the diffusion angle,residence time and water film weight of eight cross-flow fillers at different flow and wind speeds were studied to predict the heat dissipation performance of fillers.The diffusion angle and residence time are related to the surface shape and hydrophobicity of the molded piece.Large diffusion angle and long retention time indicate that the heat dissipation performance of fillers will be better.The greater the water film weight,the better the distribution of the water refill surface.However,it is not the weightest of the water film,the heat transfer effect is the best,which is combined with the diffusion angle and the residence time to judge the heat transfer performance.Experiments show that the surface retention time of No.3 and No.5 counter-flow fillers is the longest,but the No.5 is a multi-folded wave filler.Therefore,the tracer has a longer retention on the surface of the filler with the water film,but the diffusion angle of No.5 filler is obviously less than 3.No.counter-flow filler.The weight of the water film of No.3 counter-flow filler is the largest,which is consistent with the experimental results of plane contact angle and plane water retention time.It is predicted that the thermal performance of No.3 filler is the best.
作者
蔡辉
章立新
尹证
黄科诚
张跃中
沈艳
李远进
袁广
Cai Hui;Zhang Lixin;Yin Zheng;Huang Kecheng;Zhang Yuezhong;Sheng Yan;Li Yuanjin;Yuan Guang(School of Energy and Power Engineering&Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,University of Shanghai for Science and Technology,Shanghai200093,China;FRP Design and Research Institute Corporation of Beijing,Beijing101111,China;Sanjiu Plastic Corporation of Pinghu City,Pinghu314205,China;Shanghai Tongchi Heat Exchange Equipment Technology Co.,Ltd.,Shanghai200433,China;Xiamen Tobacco Industry Co.,Ltd.,Xiamen361022,China)
出处
《山东化工》
CAS
2019年第10期52-55,共4页
Shandong Chemical Industry
关键词
填料
实验台
扩散角
滞留时间
水膜重量
filler
test bed
diffusion angle
residence time
water film weight
