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采用流动沸腾传热试验平台,研究了2 m长铁基烧结型内表面多孔管竖直管内流动沸腾传热特性,利用流动沸腾传热学基本原理及公式计算了传热过程中的热通量、沸腾传热系数及相关参数,并考察了过热度和流速对多孔管流动沸腾传热性能的影响。结果表明:烧结型表面多孔管的流动沸腾传热能力优于同条件下的光滑管,内表面沸腾传热系数是同尺寸光滑管的1.6倍左右,沸腾所需的壁面过热度比光滑管的低5℃左右,过热度和管内流速增大均可使得多孔管的沸腾传热系数增大。同时分析了表面多孔管比光滑管传热性能优良的原因。
Flow boiling heat transfer test platform was used to study the boiling heat transfer characteristics of 2 m long iron-based sintered inner surface porous tube in vertical tube. The heat flux in the heat transfer process was calculated by the basic principles of flow boiling heat transfer and the formula , Boiling heat transfer coefficient and related parameters, and investigated the influence of superheat and flow rate on the flow boiling heat transfer performance of porous tube. The results show that the flow boiling heat transfer capacity of sintered porous tube is better than that of smooth tube. The boiling heat transfer coefficient of inner surface is about 1.6 times that of smooth tube with the same size. Low about 5 ℃, superheat and flow rate can increase the porous tube boiling heat transfer coefficient increases. At the same time, the reasons for the excellent heat transfer performance of the porous tube over the smooth tube were analyzed.