请各位高手看看问题出在哪里

laoda1996

提示错误：

Flow reversal of liquid at the cold stream outlet nozzle is likely to occur (Wallis dimensionless gas velocity (0.187) < 0.5).  Consider a design revision to increase the nozzle velocity.

Flow reversal of liquid at the top of tubes is likely to occur, since the Wallis dimensionless gas velocity (0.553) is less than 1.0. You should consider a design revision to increase the tubeside velocity.

laoda1996

附件！！！！