The characteristics of flow rate-pressure were evaluated. Findings indicated that for the micron round channel with inside diameter 20 μm, 50 μm and 100 μm, its flow characteristics fit close to the normal flow.

The structure of flow and the characteristics of flow behind all these five bluff-bodies were analyzed and a new basis for succulent hot experiment was given.

In this paper the characteristics of flow in open channelwith different beds under different disturbs are measuredsystematically in laboratory flume with Acoustic DopplerVelocitimeter (ADV) and flow visualization device of waterdyeing.

Eulerian multiphase model and porous media model were applied in the condition of different flow control device and the characteristics of flow in the tundish with gas blowing at the bottom was mathematically simulated.

In the last part, the mechanism of effervescent atomization is used to deign three times atomizer. The characteristics of flow rate, atomization and combustion test were carried out.

This paper describes the structure composition and operation of the electric explosion- proof V-ball valve, analyses the characteristics of flow rate and the influence factors, and discusses the principle and key point of explosion-proof design. The traditional structure of the valve is greatly improved so that the new kind of V-ball valve has the following advantages : high precision of adjustment, good safety of explosion-proof, reliable sealing, low driving torque and long life of use.

Its working principle and characteristics of flow were analyzed,the optimal mathematic model was established,and a living computation example was presented.

An investigation into the impact characteristics of flow distribution in axial piston pump using rotary valve plate for displacement regulation and the improvement on it are presented in this paper, main calculation formula and chart are built. An optimal design of valve plate can be ob-tained by emploving them.

Characteristics of flow around cavitating body of revolution was researched with a single-fluid with variable density approach based on Rayleigh-Plesset equation, what is called mixture model embodied in commercial CFD code Fluent 6.0. The first investigation was on geometrical and drag characteristics of partial cavity around some bodies with distinct head-forms by employing a 2D axisymmetric solver.

Calculations of the basic characteristics of flow around bodies entering the atmosphere in the continuousmedium regime are reviewed.

The rheological characteristics of flow of the air stream past the drops of molten metal have a pronounced influence on the processes of heat and mass exchange between the particles and the surrounding atmosphere.

Some Metrological Characteristics of Flow Meters in Which the Coriolis Force Is Used

The method is based on design modifications of the measurement system sensing devices with a view toward affecting the local characteristics of flow past the total- or static-pressure intakes.

Technique for computing characteristics of flow-type electrical transducers

The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for...

The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for the reproduction of main hydraulic and thermal characteristics in models; and on the other hand, it should be practical to satisfy the criteria in ordinary hydraulic laboratories. The similarity laws thus obtained are presented in equation (17). When the room temperature and moisture content can be controlled and adjusted the similarity laws as shown in eq. (13) are recommended. A series of verification tests and field observations were carried out in the following years, the latter being made in two cooling reservoirs. In one of the reservoirs, which has an average water depth of 4.5m and a surface area of 5 km~2, general flow pattern of the surface layer and of the bottom layer of the thermal density current was observed. They were well verified in a model with length scale L_r=250 and depth scale Z_r=40. The other cooling reservoir is a much smaller one, with surface area of only 9000 m~2 and an average water depth of 2.5m. Besides flow characteristics, the variation of the temperature field of the reservoir and of the total heat balance with respect to time were carefully measured. A model with L_r=15 and Z_r=6 served to verify the hydraulic and thermodynamic data obtained in the field. The paper is a collective report, including the derivation of the similarity law and its verifications, and a discussion of the scale effects.

By adopting the critical depth ye and critical slope σ as the parameters for flow depth and bottom slope respectively,this paper presents the unified nondimensional computation method for 15 types of flow profiles in trapezoidal open channels with five classes of bottom slopes.Some new ideas for the characteristics of flow profiles have been explored by examples of computation and plotting of the generalized nondimensional φ(u) function.Furthermore, this paper indicates that it is improper to use symbols...

By adopting the critical depth ye and critical slope σ as the parameters for flow depth and bottom slope respectively,this paper presents the unified nondimensional computation method for 15 types of flow profiles in trapezoidal open channels with five classes of bottom slopes.Some new ideas for the characteristics of flow profiles have been explored by examples of computation and plotting of the generalized nondimensional φ(u) function.Furthermore, this paper indicates that it is improper to use symbols σe and σo to represent the critical slope corresponding to the critical depth ye and normal depth y0 respectively,since if the discharge Q is a given value, σe and σo must be identical. Usually, the hydraulic exponent for trapezoidal open channel is suitable to be represented by n and m, or it is not reasonable to use a single value n, besides the exception of shallow wide rectangular section.

In this paper, the early stages of unsteady flow around a circular cylinder, started impulsively from rest and subsequently moving with a constant velocity perpendicular to its axis, are studied by coupling discrete vortex potential flow theory with boundary layer theory. The flow is considered to be laminar and the Reynolds number in high. development in time of vortex motion, characteristics of flow field, boundary layer separation point and drag coefficient are given in detail. Results of coupled calculation...

In this paper, the early stages of unsteady flow around a circular cylinder, started impulsively from rest and subsequently moving with a constant velocity perpendicular to its axis, are studied by coupling discrete vortex potential flow theory with boundary layer theory. The flow is considered to be laminar and the Reynolds number in high. development in time of vortex motion, characteristics of flow field, boundary layer separation point and drag coefficient are given in detail. Results of coupled calculation contain the interactions between boundary layer, external potential flow field and near wake. The calculated development of symmetric vortex posseses many of the observed features in flow field visualization. Pressure and velocity distributions are also given. The drag coefficient obtained is in excellent agreement with experiment. In the calculation of boundary layer separation point, the Startford method is applied to the quasi-steady boundary layer state. The calculated result is better than those given by others and the computation is simpler. Shedding times and locations of discrete vortices, which have been generated before the boundary layer reaehs the qusi-steady state, are determined according to the unsteady M. R. S. criterion. The effect of these initial discrete vortices on the main vortex development and flow field is also discussed.

本文用离散涡位流理论与边界层理论相结合的方法,研究高雷诺数、不可压、层流情况下圆柱非定常运动的初期流动(圆柱由静止突然起动而后保持匀速运动),给出了柱后旋涡发展的详细过程;流场分布、边界层分离点及阻力等随时间的变化规律。本文耦合计算结果包含了流动过程中边界层、外流与近尾迹三者的相互作用。计算所得的旋涡发展与实验显示的图象十分相似,物面压力与速度分布合理,阻力计算与实验结果相符很好。在分离点耦合计算中将stratford方法应用到准定常边界层情况,计算方法简单结果也较满意。对于准定常变化前分离产生的离散涡,其脱落时间和初始位置,本文根据非定常M. R. S. 分离准则确定。文中还讨论了这些离散涡对柱后旋涡发展及流动的影响。