复合粉末多孔表面管的沸腾传热

Boiling heat transfer on composite powder porous surface tubes

采用管内去离子水加热管外丙酮沸腾的方法对复合粉末多孔表面管的沸腾传热特性进行了实验研究,获得了沸腾传热系数和K值随温度和几何参数的变化情况,并与国内几种多孔表面管的实验结果进行了比较,同时对多孔管的抗垢性能进行了分析.实验结果表明,多孔层孔隙率对沸腾传热系数的影响最大,多孔管的沸腾传热系数是同类型的光滑管的14倍,多孔管具有一定的抗垢性能.所得结果为该种类型多孔管的工业化应用提供了科学依据.

Sintered porous coating of composite powder was applied on heat transfer tube. An experiment on enhanced boiling heat transfer with composite powder porous surface tubes was carried out, which used de-ionized water in tube to heat and boil acetone out of tube. The coefficient of boiling heat transfer, K and geometric parameters were measured and compared with the experimental results of a smooth tube and other domestic porous surface tubes. The resistance to fouling of porous surface tubes was also studied. The results indicated that porosity was the most important factor for the coefficient of boiling heat transfer of porous surface tubes. The coefficient of boiling heat transfer of porous surface tubes obtained in this paper could reach 14 times of that of smooth tubes at the same condition and porous surface tubes had the capability of resistance to fouling, which provides scientific data for the commercialization of that type of porous surface tubes.