空气-水两相逆流传热传质特性研究

Research on Heat and Mass Transfer Characteristics of Air-water Two-phase Counter Flow in Packed Tower

在填料层高度为0.4 m,内径75 mm的填料塔内进行了空气、水逆流条件下的传热传质研究。结果表明:随空气流量的增加,传热系数和传质系数显著增加;与气体流量相比,液体流量和入口水温度对传热传质影响不明显,说明该过程受气膜控制。在本研究条件下总传热系数在10~70 W·m^(-2)·℃^(-1);总传质系数在1.5×10^(-3)~8.0×10^(-3)kg(绝干)·m^(-2)·s^(-1)。

We did the research about the heat and mass transfer characteristics under the conditions of air and water counter flow in a packed tower with packing height of 0.4 m and inner diameter of 75 mm. It was founded that the heat transfer coefficient and mass transfer coefficient increased with the increasing air flow, but the heat transfer coefficient and mass transfer coefficient has slight influence with water flow and temperature. It can be concluded that the mass transfer process was control with the resistance in the gas-phase. The total mass transfer coefficient is in the range of 10～70 W·m^-2·℃^-1 and the total mass transfer coefficient is 1.5×10^-3～8.0×10^-3kg·m^-2·s^-1 on the experiment conditions.