时间级 meaning in Chinese

time stage

Combining the unstable heat conduction in crystal layer with heat transfer of undeveloped slug flow in a vertical tube , a time - progression model of crystal layer growth in the bubble column crystallizer pipe is proposed , the calculation results from the numerical method agree well with the experimental data . under certain operating conditions , the periodical arrival of gas plugs can cause crystallization and partial re - melting occur in the crystal - melt interface
结合未充分发展弹状流的传递特征和晶层内不稳定导热，提出了鼓泡塔结晶器管内晶层生长的时间级联模型,与实验值吻合良好.特定操作条件下，随弹状泡的到来和离去，结晶界面可发生结晶-部分重熔