Topological acoustics has recently revolutionized fundamental concepts of acoustic propagation, giving rise to strikingly unique edge modes immune backscattering. Despite the rapid progress in this field, simultaneous realization reconfigurability, intelligentization, and automatic control over propagation paths is posing a great challenge. This challenge overcome by proposing concept programmable topological insulator based on two digital elements "0" or "1," which consist honeycomb-lattice...

Cavitation is a challenging flow abnormality that leads to undesirable effects on the hydraulic behaviour of centrifugal pumps. This study analyses cavitating at normal rate using shear stress transport k-ω turbulence model and Zwart cavitation capture development spatial distribution vapour structures within pump. A general description pump head-drop phenomenon was analysed through local global fields. The relationship between entropy generation fields mainly investigated analysis method....

To examine the cavitation noise characteristics of centrifugal pumps, combination test and simulation was applied in this study. The numerical method is based on spherical cavity radiation theory acoustic finite element method. A multi-field synchronized test-rig built to study validate results under cavitating flow conditions. three-dimensional unsteady flow-field carried out inside pump DES improved-RZGB model. constructed for used solve acoustic-field solutions. test–simulation comparison...

Electrical submersible pumps (ESPs) face enormous challenges in the petroleum industry while handling gas–liquid two-phase flow. The major difficulty is caused by accumulation of gas bubbles inside ESP-impellers, which results mild to severe degradation pump performance. Therefore, analyze influence entrainment and bubble size, a combination experimental numerical analysis performed on five-stage mixed-flow ESP present study. experiments are first conducted performance under pure water...

The working capability of multi-stage pumps, such as electrical submersible pumps (ESPs) handling multiphase flow, has always been a big challenge for petroleum industries. major problem is associated with the agglomeration gas bubbles inside ESP-impellers, causing pump performance degradation ranging from mild to severe deterioration (surging/gas pockets). Previous literature showed that two-phase ESPs greatly affected by involvement, rotational speed, bubble size, and fluid viscosity....

Abstract Electrical submersible pumps (ESPs) dealing with gas-liquid multiphase flow face great challenges in the oil and gas industries. The main problem is caused by accumulation of air bubbles inside ESP, which degrade pump performance ranging from minor to major degradation (surging gas-locking). Several empirical models have been developed predict head surging mechanisms. However, feasibility versatility these are still questionable. Therefore, this study focuses on experimental...

Metasurface holograms represent a common category of metasurface devices that utilize in-plane phase gradients to shape wavefronts, forming holographic images through the application generalized Snell's law (GSL). While conventional metasurfaces focus solely on gradients, metagratings, which incorporate higher-order wave diffraction, further expand GSL's generality. Recent advances in certain acoustic metagratings demonstrate an updated GSL extension capable reversing anomalous transmission...

Capability for handling entrained gas is an important design consideration centrifugal pumps used in petroleum, chemistry, nuclear applications. An experimental evaluation on their two phase performance presented working under air-water mixture fluid conditions. The geometries of the are designed same flow rate and shut off head coefficient with impeller rotational speed. Overal pump unsteady pressure pulsation information obtained at different speeds combined various inlet air void...

Cavitation has bothered the hydraulic machinery for centuries, especially in pumps. It is essential to establish a solid way predict unsteady cavitation evolution with considerable accuracy. A novel model was proposed, considering rotating motion characteristic of centrifugal pump. Comparisons were made three other models and validated by experiments. Considerable agreements can be noticed between simulations tests. All employed have similar performance on predicting pump head drop curve...

This paper presents an investigation of pressure fluctuation a single-suction volute-type centrifugal pump, particularly volute casing, by using numerical and experimental methods. A new type hybrid Reynolds-averaged Navier-Stokes/Large Eddy Simulation, referred to as the shear stress transport-scale-adaptive simulation (SAS) model, is employed study unsteady flow. Statistical analysis method adopted show intensity distribution in channel. test rig for pulsation measurement built validate...

We demonstrate, both numerically and experimentally, an ultra-low-frequency sound absorber its application in silenced ducts. The comprises array of resonant dual-spiral channel units (with a thickness λ/47) backed by wall, achieving near-perfect absorption with fractional bandwidth 18.3% around 73 Hz—a hallmark absorption. This characteristic arises from effective near-zero modulus, the absorbed energy dissipated through viscous losses unit channels. Furthermore, we explore this By...

Ventilated cavitation involves complex multiphase flow, phase change, and turbulence, posing challenges for accurate prediction control. This paper investigates the performance of three turbulence models—Large Eddy Simulation (LES), Detached (DES), Shear Stress Transport (SST)—in predicting unsteady characteristics entropy generation mechanisms in ventilated around a hydrofoil. A comparative analysis with experiments reveals each model's strengths limitations capturing at various scales. The...

Magnetic pumps transmit torque without leaks using magnetic induction, offering superior sealing over conventional by replacing dynamic with static seals. They are vital for handling hazardous or valuable fluids, enhancing safety and efficiency while cutting maintenance costs. Despite their reliability, they face failure risks from temperature, lubrication, contamination. This article reviews fault patterns, causes, impacts in explores advanced sensor-based intelligent diagnostic methods to...