Papers by Keyword: Fluid Mechanics

Abstract: In order to deal with the impact on traffic flow of the rule, we compare the influence factors of traffic flow (passing, etc.) into viscous resistance of fluid mechanics, and establish a traffic model based on fluid mechanics. First, in heavy and light traffic, we respectively use this model to simulate the actual segment of the road and find that when the traffic is heavy, the rule hinder the further increase in traffic. For this reason, we make further improvements to the model to obtain a fluid traffic model based on no passing and find that the improved model makes traffic flow increase significantly. Then, the improved model is applied to the light traffic, we find there are no significant changes in traffic flow .In this regard we propose a new rule: when the traffic is light, passing is allowed, but when the traffic is heavy, passing is not allowed.

Abstract: The pits is a typical biomimetic surface morphology, typically it is beneficial to reduce the flow drag on the wall surface. In this paper, a method combining theoretical analysis and numerical simulation is adopted, it carries out a flow and stress analysis on the wall surface distributed by 3mm-diameter pits with typical bionic surface morphology, reveals the forms down stream flow field and the pit internal as well as the distribution of stress, it also analyzes the relationship between the viscous drag of the pit wall surface, the pressure drag and the flow drag, comparing the size of the downstream shear stress of the smooth wall and wall surface distributed with pits, investigates the mechanism of the downstream shear stress decreases on the biomimetic pit wall surface.

Abstract: Thermal film air flow sensor has the characteristics of high precision and fast response. The intake-air velocity in the engine inlet manifold is over the measurement range of the sensor, it is necessary to design special sampling flow channel which can reduce the flow velocity and achieve a stable flow state. The micro flow channel flow field was simulated with CFD meathod, the results show that a well-designed sampling port can obtain stable flow field and effectively low the speed, which can improve the velocity uniformity for measurement in the sensor location. The sampling channel conduces to obtain higher measurement accuracy.

Abstract: According to the TTCP geometry, change the wrap-around fins to the planar fins. Construct the flow-field then generate the grid. Utilizing the computational fluid dynamics method, the lift, drag and roll moment coefficients are computed in different angles of attack. The roll moment coefficients are computed from the flow field solution and compared with the experimental results. The results show good agreement with the experimental measurements for various flight Mach numbers. The aerodynamic characteristics of these two fins are similar to each other from the numerical solution. If consider the lift, drag and center of pressure coefficients merely, these two kinds of fins can be interchanged .But the roll moment coefficient in Wrap-Around fins and planar fins are different. They need to calculate separately.

Abstract: The key technology of empty absorption column is the atomizing effect of Nozzle, The good atomization effect of The nozzle can improve the transfer effect. The high efficient atomizing nozzle with the built-in spiral, reverse flow and large flow is designed in this paper. It completely solves the contradiction between plug and atomization. Application of atomizing nozzle in ammonia desulfurization of empty tower ,it also achieved very good results, Compared to other nozzle which is widely used, the desulfurization effect is improved by 5-6% in empty absorption column.

Abstract: In order to solve the problem that the air flow was not average in the baking room, a new type of device called air flow-divider by this paper was designed. The physical model of the device was built by Solidworks. The influence of the device towards air flow was simulated by FloXpress. The result of the simulation indicates that the air flow was more even in the baking house after the new device was fixed.

Abstract: Through toppling Bernoulli equation, gain the application of Bernoulli equation in fluid mechanics. Pay close attention to solve the problem concerning how to use it to calculate the engineering data,and how to explain some common phenomenon in our daily life .

Abstract: Air-water flows are of importance for all the areas related to fluid mechanics. Especially, although kinematic investigations of the multi-phase flows have been conducted for a long time, velocity measurements are still considered as a very challenging part. This study introduces an imaging technique applying shadowgraphy and coupled fiber optic probes for velocity measurements of air bubbles. The fiber optic probes apply optical fibers to the well-known intrusive phase detection probe with a shape to reduce flow disturbance. The present method is used for bubble plume measurements and obtained velocity result is discussed. Finally, the velocities are compared to examine the reliability of the methods.

Abstract: The two-layer Couette-Poiseuille flow of a third grade fluid is examined. The problem is reduced to solving nonlinear differential equations governing the motion of the two immiscible fluids in case of different thickness of layers. The solutions are used to study the effect of the third grade material parameter on the velocity profiles. The investigation focuses especially on the location of the velocity maximum as function of the viscosity and third grade material constant.

Abstract: The numerical experimental platform of oil containment by floating boom under combined wave and current conditions was presented in a companion paper. The present paper focuses on the application of the platform that numerically predicts the relationship between oil containment failure velocity and wave parameters, oil parameters and boom drafts. The effects of oil density and wave parameters on oil containment failure velocity receive particular attention, and the influence of other parameters such as initial oil volume and boom draft are also quantified.