Cavitating flows of organic fluid with thermodynamic effect in a diaphragm pump for organic Rankine cycle systems

Li, Wenguang; Yu, Zhibin

doi:10.1016/j.energy.2021.121495

Cited by 17 publications

(5 citation statements)

References 52 publications

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“…It is evident that the signal frequency is in positively linear correlation ( R 2 = 0.999) with the rotation speed of the driving pump (Figure d). It can be inferred that the reciprocating movement of the rotator in the peristaltic pump would arouse a transient pressure pulse, and therefore, the membrane might be subject to microelastic deformations and generate piezoelectric signals with a homologous frequency, demonstrating the pressure-stimuli-responsive behaviors of this Pi-UFM.…”

Section: Resultsmentioning

confidence: 99%

Piezoelectric Polyvinylidene Fluoride Membranes with Self-Powered and Electrified Antifouling Performance in Pressure-Driven Ultrafiltration Processes

Zhang

Wang

et al. 2022

Environ. Sci. Technol.

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Electroactive membranes have the potential to address membrane fouling via electrokinetic phenomena. However, additional energy consumption and complex material design represent chief barriers to achieving sustainable and economically viable antifouling performance. Herein, we present a novel strategy for fabricating a piezoelectric antifouling polyvinylidene fluoride (PVDF) membrane (Pi-UFM) by integrating the ion–dipole interactions (NaCl coagulation bath) and mild poling (in situ electric field) into a one-step phase separation process. This Pi-UFM with an intact porous structure could be self-powered in a typical ultrafiltration (UF) process via the responsivity to pressure stimuli, where the dominant β-PVDF phase and the out-of-plane aligned dipoles were demonstrated to be critical to obtain piezoelectricity. By challenging with different feed solutions, the Pi-UFM achieved enhanced antifouling capacity for organic foulants even with high ionic strength, suggesting that electrostatic repulsion and hydration repulsion were behind the antifouling mechanism. Furthermore, the TMP-dependent output performance of the Pi-UFM in both air and water confirmed its ability for converting ambient mechanical energy to in situ surface potential (ζ), demonstrating that this antifouling performance was a result of the membrane electromechanical transducer actions. Therefore, this study provides useful insight and strategy to enable piezoelectric materials for membrane filtration applications with energy efficiency and extend functionalities.

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Section: Resultsmentioning

confidence: 99%

Piezoelectric Polyvinylidene Fluoride Membranes with Self-Powered and Electrified Antifouling Performance in Pressure-Driven Ultrafiltration Processes

Zhang

Wang

et al. 2022

Environ. Sci. Technol.

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“…Li et al [55,56] focused on solving the NPSHr problem of the organic liquid R245fa in the organic Rankine cycle (ORC) system by considering the thermodynamic effect of cavitation. They first deduced and solved the suction valve's one-dimensional and twodimensional kinematic models.…”

Section: Cavitation Researchmentioning

confidence: 99%

A Review of the Development and Research Status of Symmetrical Diaphragm Pumps

Zhao,

Lou,

Peng

et al. 2023

Symmetry

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With the continuous improvement in human awareness of environmental protection, energy savings, and emission reduction, as well as the vigorous development of precision machinery and process technology, energy-saving and efficient diaphragm pumps have become a hot research topic at home and abroad. The diaphragm pump is a membrane-isolated reciprocating transport pump that isolates the transport medium from the piston through the diaphragm and can be used to transport high-viscosity, volatile, and corrosive media, and the symmetrical structure can make it easier for the diaphragm pump to achieve stable operation, reduce vibration and noise, and extend the life of the pump. This paper summarizes the development and research status of diaphragm pumps in recent years, including diaphragm pump structure, working principle, category, cavitation research, wear research, fault diagnosis research, vibration and noise research, fluid–solid-interaction research, and optimum research on one-way valves and diaphragms. It also puts forward some reasonable and novel viewpoints, such as applying the theory of entropy production to explore the motion mechanism of diaphragm pumps, optimizing the performance of diaphragm pumps, using new technologies to study new materials for diaphragm pumps, and designing diaphragm protection devices. This review provides valuable references and suggestions for the future development and research of diaphragm pumps.

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“…Due to the working characteristics of the diaphragm pump [ 15 , 16 , 17 ], there is a modulation phenomenon in the signal spectrum. The numerous interference frequencies increase the difficulty of fault feature extraction and reduce the accuracy of fault diagnosis.…”

Section: Introductionmentioning

confidence: 99%

A Novel Fault Diagnosis Strategy for Diaphragm Pumps Based on Signal Demodulation and PCA-ResNet

Meng,

Shi,

Song

2024

Sensors

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The efficient and accurate identification of diaphragm pump faults is crucial for ensuring smooth system operation and reducing energy consumption. The structure of diaphragm pumps is complex and using traditional fault diagnosis strategies to extract typical fault characteristics is difficult, facing the risk of model overfitting and high diagnostic costs. In response to the shortcomings of traditional methods, this study innovatively combines signal demodulation methods with residual networks (ResNet) to propose an efficient fault diagnosis strategy for diaphragm pumps. By using a demodulation method based on principal component analysis (PCA), the vibration signal demodulation spectrum of the fault condition is obtained, the typical fault characteristics of the diaphragm pump are accurately extracted, and the sample features are enhanced, reducing the cost of fault diagnosis. Afterward, the PCA-ResNet model is applied to the fault diagnosis of diaphragm pumps. A reasonable model structure and advanced residual block design can effectively reduce the risk of model overfitting and improve the accuracy of fault diagnosis. Compared with the visual geometry group (VGG) 16, VGG19, ResNet50, and autoencoder models, the proposed model has improved accuracy by 35.89%, 80.27%, 2.72%, and 6.12%. Simultaneously, it has higher operational efficiency and lower loss rate, solving the problem of diagnostic lag in practical engineering. Finally, a model optimization strategy is proposed through model evaluation metrics and testing. The reasonable parameter range of the model is obtained, providing a reference and guarantee for further optimization of the model.

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Cavitating flows of organic fluid with thermodynamic effect in a diaphragm pump for organic Rankine cycle systems

Cited by 17 publications

References 52 publications

Piezoelectric Polyvinylidene Fluoride Membranes with Self-Powered and Electrified Antifouling Performance in Pressure-Driven Ultrafiltration Processes

Piezoelectric Polyvinylidene Fluoride Membranes with Self-Powered and Electrified Antifouling Performance in Pressure-Driven Ultrafiltration Processes

A Review of the Development and Research Status of Symmetrical Diaphragm Pumps

A Novel Fault Diagnosis Strategy for Diaphragm Pumps Based on Signal Demodulation and PCA-ResNet

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