论文部分内容阅读
以电加热作为供热热源来模拟太阳能,研究了不同工况下倾斜降膜蒸发特性,通过对蒸馏器吸热面和冷凝面划分等间距小区段,根据液膜和冷凝面的温度分布,利用Dunkle模型预测了蒸馏器的产水速率.结果表明:热流密度、单位长度给水质量流量、倾斜角度和单位长度冷却水质量流量是影响蒸馏器产水速率的主要因素;产水速率随着热流密度的增大呈线性增加;在单位长度给水质量流量为5.5～10.0kg/(h.m)时,产水速率随着单位长度给水质量流量的减小呈线性增大,单位长度给水质量流量为0.7～5.5kg/(h.m)时,产水速率波动较小;在倾斜角度为15°～60°时,产水速率随着倾斜角度的增大而增大;冷却水均匀地流过冷凝面上表面有助于增大蒸馏器的产水速率;蒸馏器吸热面和冷凝面划分的区段越多,模型预测值与实验值吻合越好.
The electric heating was used as the heat source to simulate the solar energy. The evaporation characteristics of the inclined falling film under different operating conditions were studied. According to the temperature distribution of the liquid film and the condensing surface, Dunkle model was used to predict the water production rate of the distiller.The results showed that the heat flux, the length of the water flow, the angle of inclination and the length of cooling water mass flow per unit length were the main factors affecting the water production rate of the distiller. The water production rate increases linearly with the increase of feed water mass per unit length. When the feed water mass flow per unit length is 5.5 ~ 10.0kg / (hm), the water production rate increases linearly with the decrease of feed water mass flow per unit length, When the inclination angle is 15 ° ~ 60 °, the water production rate increases with the increase of the inclination angle. The cooling water flows uniformly on the upper surface of the condensation surface Which helps to increase the water production rate of the distiller. The more sections the distiller absorbs heat and condensing surface, the better the predictive value of the model agrees with the experimental value.