在微重力条件下不存在浮力和由其引起的自然对流，从而影响了燃烧基本过程。
There is no buoyancy and natural convection at microgravity condition, which will affect the fundamental process of combustion.
实验结果表明，自然循环工况下上升加热段内工质的物性变化及由浮升力引起的自由流动对对流传热特性有重要影响。
The experimental results indicate that free convection caused by the buoyancy in the heated tube with natural circulation has great influence on the heat transfer characteristics.
分析指出，该飑线系统是由高空槽前型的上干下湿引起的不稳定强对流天气。
The squall line is a kind of instable and strong convective weather caused by the air with upper-layer dry and lower-layer wet in front of the upper-troposphere trough.
本文描述由一个局部内热源和外部加热同时作用引起的封闭空腔内非稳态、二维、层流自然对流换热的数值分析结果。
Numerical analysis is made for the unsteady and steady, two-dimensional laminar natural convection in an enclosure caused simultaneously by the external heating and a local internal heat source.
充分说明龙卷风由涡旋流和急流这两种流叠加而成，涡旋流是由惯性离心力造成的，急流是由水平辐合辐散而引起的强对流。
The vortex flow is resulted from inertial centrifugal force and the jet flow is from strong convection by the horizontal convergence.
充分说明龙卷风由涡旋流和急流这两种流叠加而成，涡旋流是由惯性离心力造成的，急流是由水平辐合辐散而引起的强对流。
The vortex flow is resulted from inertial centrifugal force and the jet flow is from strong convection by the horizontal convergence.
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