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。
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。
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。
An experimental investigation showed that compared with a general external fins pipe, the new way can reduce the drag more than 40% and enhance the heat transfer about 10% meanwhile.
单管的实验研究证实，选用合理的绊条扰流结构，可使环翅管的绕流阻力降低40％，换热增强10％。
By simulation of the tractor in straight oil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
通过直管障碍的仿真实验，得出了牵引器在直管中越障时各组件的工作状态、直管越障阻力与设计牵引力的比例关系。
Parts of the pipes are dismountable so that we could investigate the drag-reduction effect of different pipe diameters.
实验管段部分可拆卸，以实现对常见管材不同管径的减阻效果研究。
Then, the variational trends of drag at the gas-liquid stratified flow in pipe have been studied.
该模型充分考虑了油水两相的物性以及两相分层流动对分离过程的影响。
Then, the variational trends of drag at the gas-liquid stratified flow in pipe have been studied.
该模型充分考虑了油水两相的物性以及两相分层流动对分离过程的影响。
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