The results suggest that the effects of buoyancy force, variable physical properties of the fluid, and duct geometric characteristic on flow and heat transfer can be very significant.
研究表明，流体剧烈变化的热物性、浮升力以及三角管的几何特征对管内流动换热的影响非常明显。
It is very difficult for the conventional numerical reservoir simulation theories to describe the characteristic of fluid flow in low permeability media, because they are all based on the Darcy's law.
而传统的油藏数值模拟理论都是建立在达西定律之上的，因而它很难反映低渗介质中的流体渗流特征。
The characteristic parameters of fluid during the transition in boundary layer are obviously different from that of the laminar flow or the turbulent flow.
边界层转捩流动的特征参数明显不同于层流或湍流，转捩流动的这些特征直接影响着流体的动力、传热特性。
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