A thin surface layer always exists near the surface of laser heating melt pool due to the fluid flow driven by the surface tension gradient.
在激光材料加热中，由于存在着表面张力驱动的流动，熔池表面附近熔体的速度梯度很大。
Meanwhile, by the influence of water vapor in the process of heating, the gradient of equivalent potential temperature weakened, and baroclinic term also declined, so the total MPV increases.
同时，在此过程中受水汽加热的影响，水平相当位温梯度减弱，负的斜压项减弱，使得总的湿位涡正值增大。
This paper analyzes air source in heating system, states that gas is harmful in the system, points out level pipe gradient being small in single measure system, and velocity of flow must keep great.
本文通过分析采暖系统中的空气的来源，提出空气在系统中的危害，针对单户计量系统中水平管坡度较小，提出水平支管中水流速应保持较大。
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