This paper summarises a study which aims to develop and analyze the performance of the valveless impedance pump. Mechanism of valveless impedance pump is to apply acoustic impedance mismatch in order to drive the flow and also consists of a flexible connection at the ends to the more rigid sections. Characteristics of liquid velocity and pressure at the pump base valveless impedance at various supply voltage and different frequencies have been discovered through experimentation. Secondly, this research also aims to discuss the effect volume flow rate (millitres / min) in the elastic tube impedance based on different parameters of the pump pinch. The variation of pinch location and pinch width are also available through the results of this study. This study begins with the design set up to use the software and followed by installing all equipment used for the experiments. Then, this study continues to get results and make an analysis of the impedance pump by experimentation. Results found that all the parameters used in this experiment affect the flow rate in the impedance pump. Additional experiments on the effect of the thickness of the flexible tube on the flow rate gave lower values when the flexible tube is relatively thicker.
This study is a CFD analysis of electromagnetic based valveless pump in biomedical devices and biological MEMS (bioMEMS) application. The focus of the studies are designing a well performed pump where the required displacement of diaphragm can still be achieved even when the force applied is reduced and also a mechanism that requires low input current. Various parameters such as radius of the microcoil and diaphragm; and thickness of the magnet are compared to help choosing a proper pump. By using DesignModeler, Magnetostatic Analysis and Static Structural Analysis of ANSYS, Inc. Version 13.0, the geometry was modeled at micro scale and the results of force and displacement on the diaphragm were simulated. The main findings are the pump only required to be applied with 1.94 mN of force to reach at least 0.11 mm of diaphragm displacement with the input current of 0.5 A. The dimensions of the actuator mechanism design are 1.4 mm of magnet thickness and 2.05 mm of diaphragm radius. Electromagnetic actuation was selected because it can contribute several main benefits which are faster reaction time, longer operational range and low actuating voltage. Thus, it is important to analyze the electromagnetic mechanism to further understand it. Furthermore, the numerical results proved that an actuator mechanism comprises of permanent magnet, PDMS diaphragm and microcoil can provides enough actuating force for a large diaphragm displacement to take place under a safe and consistent pumping process. Hence, the electromagnetic pump design by this study can be used as the best application for microfluidic systems where a high pumping amount is desired.
The study of the separation phenomena inside hydrocyclone often encounters an issue related to particles being misplaced at the outputs since there is a large variety of particle densities. This research presents a numerical study of multiphase flow inside hydrocyclone to analyse the relationship between the separation efficiency of particles and the diameter of the cylindrical section to complete the separation process which greatly affect the overall performance of hydrocyclone. The performance of the hydrocyclone were evaluated using (CFD) method to simulate multiphase flow inside the hydrocyclone. In this study, the Reynolds Stress Model (RMS) is used in the model to simulate the swirling turbulent flow of gas and liquid, and the Volume of Fluid (VoF) Multiphase Model is used to simulate the interface between the liquid and the air core. The solid particle motion is then tracked using the outcomes from the simulation of particle in the The Discrete Element method (DEM) model. Pressure and velocity play important roles in the separation of particles. A centrifugal force that separates particles according to their mass is produced when the hydrocyclone's input is subjected to higher pressure. The fluid's velocity increases as it moves towards the device’s centre, causing the hydrocyclone to rotates and produces a spiral flow pattern. Higher diameter of the cylindrical section, provide higher tangential velocity of particles and their centrifugal forces, resulting in great collection efficiency. In this paper, it has been demonstrated numerically that the performance of hydrocyclone is significantly influenced by the different diameter of the cylindrical section. As of the simulation analysis, increasing the diameter of the cylindrical section has increased the separation efficiency from 34.4% to 44.3% for particle size of 5 μm respectively. Based on the pressure, velocity and streamlines distribution profiles obtained, the results revealed that the tangential velocity contributes largely to the centrifugal forces, resulting in a substantial collection. The increase in diameter increases the residence time of particles inside the hydrocyclone making the swirl rotation of particles more frequent. Thus, it increases the effect of clarity separation and boosts separation accuracy and efficiency.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.