A pump is one of the most important machines in processes and flow systems. The operation multistage centrifugal pumps could generate pressure fluctuations instabilities that may be detrimental to performance integrity pump. In this paper, a numerical study influence unsteady patterns was undertaken channel three configurations with different diffuser vane numbers. It found amplitude fluctuation increased gradually increase number vanes. lower vanes beneficial obtain weaker intensity. With...

An impeller blade with a slot structure can affect the velocity distribution in flow passage of centrifugal pump, thus affecting pump’s performance. Various geometric parameter combinations were tested this study to explore relationship: position p, width b1, deflection angle β, and depth h (3–4) levels selected for each factor on an L16 orthogonal test table. The results show that b1 are major factors influencing pump performance under low rated conditions, while p is large condition. close...

Air vortex flow can induce small amplitude vibration of aerostatic bearings on the order nanometers, which is known to be harmful positioning accuracy aerostatically supported devices in ultra-precision applications. In this paper, suppress and reduce bearings, a novel design arrayed microhole restrictor (AMR) proposed, its effects are numerically experimentally investigated. By computational fluid dynamics analysis, transient features studied for with AMR conventional restrictors, static...

Bubbling liquefaction of dense particles is one the most common forms industrial fluidization in gas–solid flow systems. Computational fluid dynamics and discrete element method are important tools for studying flows. In these methods, momentum transfer between phases relies on a drag model, so reasonable choice model crucial accurately predicting hydrodynamic behavior This paper investigates effect different models prediction “Small-Scale Challenge Problem-I” published by National Energy...

Abstract The flow structures and unsteady behaviors of a flat plate film cooling behind single row circular holes fed by internal crossflow were extensively investigated. investigation was achieved experimentally using fast-response pressure-sensitive paint (PSP) at high frame rate numerically large-eddy simulation (LES). During the experiment, coolant discharged from discrete (i.e., with 3D spacing, 6.5D entry length, 35 deg incline angle) via channel. Two blowing ratios (M = 0.4 0.8)...

High-performance tactile sensors are urgently demanded in various intensive interactive scenarios, e.g., texture detection, robotic interaction with fragile objects, and motion direction recognition, where dynamic conditions involved complex tangential forces or vibrations. Although many microstructured/porous can perceive forces, their isotropic structures that lack programmability lead them to be incapable of sensing the restrain tunability for situations, a wide range large high...

The difficulties of traditional rigid/soft grippers in meeting the increasing performance expectations (e.g., high grasping adaptability and wide graspable objects range) a single robotic gripper have given birth to numerous soft-rigid coupling with promising performance. However, it is still hard for these hybrid adaptively grasp various diverse fragilities intact, such as incense ash orange, due their limited contact stiffness adjustable range compliance. To solve challenging issues,...

Coupled extensional and flexural vibrations of an ultrasonic piezoelectric transducer are studied in the paper. The is made polymer PVDF films modeled as a corrugated cylindrical shell with finite width ridge direction, which consists multiple pieces circular surfaces smoothly connected along their ridges. classical theory used to obtain theoretical solution. Effects edge constraints on vibrational characteristics resonant frequencies, mode shapes, internal forces investigated for consisting...

The fluidized bed is a critical reactor in the energy and chemical industries, where mixing agglomeration behaviors of binary particles significantly influence both efficiency reaction processes uniformity final products. However, selection appropriate drag force models remains subject debate due to variability particle properties operating conditions. In this study, we investigated fluidization behavior mixtures composed two different sizes Geldart-D within bed, evaluating nine distinct...

Abstract. In this investigation, a computational study of the air–granular flow in an aerodynamic harvesting and separation machine is investigated using realistic dimensions shape particles. This was done by integration Discrete Element Method (DEM-Rocky 4.13) Computational Fluid Dynamics (CFD-ANSYS Fluent 18.0) software one-way coupling approach. The designed constructed cyclonic approach to harvest jojoba seeds from soil surface. During that, lot undesired materials such as leaves,...

The full-scale aerodynamic simulation of the missile has always been first step in overall design missile. After simulation, a large number data for are obtained, and prerequisite trajectory will be met. In this paper, some common processing methods used to identify law parameters shape, so that all can obtained by combining interpolation algorithm with small amount parameters. This method greatly accelerates Speed initial missile, you complete more iterative optimization short period time....

A modular assembled missile is designed recently. We can assemble different cabins just before launching to meet requirements, and in this paper we choose one of the combinations for analysis. Firstly, use commercial software Fluent simulate aerodynamic with arc tail canard rudder high maneuvering state at attack angles flying Mach number. Next, by changing boundary conditions simulation, variation law lift coefficient, drag coefficient pitch moment flight velocity module obtained. In...

Injection of gas-carried powders by an immersed lance is among the most popular desulphurization methods in many metallurgical processes.This paper proposes a CFD algorithm to simulate transient multiphase flow powder injection process, using volume fluid (VOF) method calculate gas-liquid and discrete phase model (DPM) capture particles motions.The k-ε also adopted solve turbulent field.Experimental results on water are compared with simulation qualitative agreement found.Then, used...