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《Chemical Engineering and Processing: Process Intensification》1988,24(3):121-132
A solution to the momentum and continuity equations in stratified and annular two-phase laminar flow is presented for the cases of parallel plates, round and elliptical tubes. The velocity distribution, mean velocity, void fraction and pressure drop are evaluated in each geometry. It is shown that the pressure drop in elliptical tubes with the main axis of the ellipse in a vertical position is smaller than in a horizontal position. In general, the pressure drop is lower when the channel geometry is such that the contact area between the phases is smaller. The effect of liquid viscosity upon the pressure drop is stronger for low flow quality and decreases rapidly with an increase of the gas flow rate. 相似文献
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等K法是校核双滑面坝基深层抗滑稳定性问题的主要方法。实际操作中,不同的取值方法对安全系数结果影响很大。现有的取值方法或根据以往的工程经验,或直接参照有限元计算成果进行取值,缺乏严格的理论基础,其合理性、使用范围有待详细判定。研究发现:①对双滑面问题,直接对滑面进行模拟得到的应力结果不宜用于刚体极限平衡法,必须对滑动面进行修正;②刚体极限平衡法中滑动力代数之和,与采用修正滑面的有限元强度折减法极限状态滑动面上剪应力叠加之和相等,并应在此基础上对安全系数及抗力角进行求解。 相似文献
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《Simulation Modelling Practice and Theory》2003,11(5-6):353-370
In recent years, tuned liquid dampers (TLD) have proved a successful control strategy for reducing structural vibrations. The present study focuses on the frustum-conical TLD as an alternative to the traditional cylindrical tank. If compared to the cylindrical reservoir, the cone-shaped TLD allows calibrating its natural frequency through varying liquid depth, which makes it suitable for a semi-active implementation, and attains the same level of performance with a fewer mass, at least for small fluid oscillations. A linear model is presented which can interpret TLD’s behaviour for small excitations. For larger amplitudes, strong nonlinearities occur and the linear model is no longer predictive. Consequently, for a frustum-cone TLD subjected to harmonic excitations, a tuned mass damper (TMD) analogy is established where TMD parameters vary with the excitation amplitude. 相似文献
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