In air and mist drilling, annular carries are the typical of gas, liquid and solid multiphase flow, and its mechanism and principles are very complicated.

在空气雾化钻井中，井眼环空携岩流动是一种典型的气、液、固多相流动，其机理和规律十分复杂。

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A theoretical analysis was carried out for evaporative heat transfer of annular two phase flow of liquid film and high velocity air in vertically heated tubes.

通过理论分析，研究了竖直传热管内降膜-高速空气环状两相流的蒸发换热特性。

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Its basic principle is that there is a quite steady flow state of annular flow in the flow pattern of gas-liquid two-phase flow.

模型是建立在压力能量消耗率最小的原理上的，其基本原理是：在气-液两相流的流型中，环状流具有相当稳定的流动状态。

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