Based on the test results and movement equation established, the relationship between drag coefficient and tubular shape is obtained and the drag force imposed on pipe is calculated.

根据试验结果和建立的运动方程，获得阻力系数与圆管形状的关系，并计算了圆管所受到的拖曳力。

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In this paper the thermal drag and entropy generation of a heated pipe flow are analysed by means of numerical computation.

本文利用数值计算方法，对圆管加热流动的热阻力和熵产进行了综合分析研究。

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In this paper, under the gas-liquid stratified laminar and turbulent flows, and the mixture turbulence flow by aeration in pipe, the laws of drag reduction have been researched.

本文研究了圆管中气液分层层流、分层紊流及掺气混合紊流情况下的阻力减小规律。

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