不互溶液体内泡滴的直接接触传热模型

摘要

研究垂直管内两不互溶液体——正戊烷-水系统的直接接触传热，管内易汽化的液体从管底用氮气压入形成分散泡滴，不易汽化的连续相液体在加热到一定温度后，以并流形式流过．在考虑气泡被连续相流体 破碎的情况下，借助于平均体积传热系数模型，在理论分析基础上通过实验研究建立了单个气泡的传热系数模型，模型参数有较好的关联性．%The heat tran sfer of the dispersed droplets of a volatile liquid sprayed upward in an immisci ble continuous-phase liquid in a vertical tube are analyzed for an n-pentane- water system.According to the definition of the turbulent film heat transfer coe fficient based on a surface area of a spherical two-phase droplet,a heat transf er model of a droplet in an immiscible liquid is developed.Making use of the volum etric heat transfer coefficient derived under taking into account the fragmentat ion of the two-phase droplet,the parameters in the model are determined by the theoretical analysis and the experimental research.