Performance Improvement and Two-Phase Flow Study of a Piezoelectric Micropump with Tesla Nozzle-Diffuser Microvalves

Abstract

The Present article aims to design a piezoelectric micropump using a combinational form of microvalves with sufficient diodicity in low-pressure gradients. The goal is to enhance the capability of piezoelectric micropumps with Tesla-type valves in order to deliver insulin. Tesla-type valves are in the category of passive valves which have sufficient diodicity in case of high-pressure gradients. However, low mass flow rates are often required in drug delivery devices. In this paper, the performance of MT135 Tesla-type valve in low pressure-gradient flows has been investigated and a range of reunion angles, which have not been studied before has been examined by numerical solutions. Inspired by nozzle-diffuser valve types, some changes in the bypass path of the microvalve have been exerted to boost the diodicity of the valve in low-pressure conditions that resulted in 9.97% increase of diodicity. At last but not least, the velocity gradients in singlephase flow of water has been attained and performance of micropump toward other kinds of flows has been investigated by a volume of fluid (VOF) model including water as the primary phase and air as the secondary one. To complete the analysis, a VOF model consisting of an arbitrary kind of Casson fluid with the primary phase of water was reached and discussed.

Large-Scale Piezoelectric-Based Systems for More Electric Aircraft Applications

“…The diffuser valve or valveless design is also used in the piezoelectric pump, but mostly in a micropump driven by a diaphragm piezoelectric. This valve type can be conical [ 179 , 180 ] or a Tesla valve [ 153 , 181 ]. These designs do not have any moving parts, so they do not suffer from fatigue failure as compared to other valves.…”

“…This fluid circuit will then be extended into a working cylinder via a control valve system and accumulator. Some researchers have worked on developing the pump design to maximize the flow rate and pressure performance [144,[149][150][151][152][153] while other researchers have attempted to build a compact system with an integrated hydraulic cylinder [139,150,154,155]. The performance of this hybrid pump relies on both the design of the piezoelectric stack and the pump chamber and the use of hydraulic fluid and the valve system.…”

Numerical Simulation and Experimental Study on Internal Depressurization Flow Characteristics of a Multi-layer Sleeve Regulating Valve

“…In addition to using computational fluid dynamics to carry out numerical simulations, many other scholars conducted corresponding experiments to verify the accuracy of numerical simulations (Asim et al 2017;Cui et al 2017;Yang et al 2017;Derakhshan et al 2019;Zawawi et al 2022). Zhang et al (2022) proposed a bionic valve core structure based on Bio-TRIZ, they explored the distribution of the pressure field, velocity field, and the cavitation field in a regulating valve, by experiment and simulation methods.…”

The impacts of the gas diffusion layer contact angle on the water management of the proton exchange membrane fuel cells: Three‐dimensional simulation and optimization

“…Computational fluid dynamic (CFD) is a branch of fluid dynamics that utilizes computer-based numerical methods to discretize and solve the principle equations of a fluid flow problem. 13 In addition to mass, energy, and momentum, 3D simulation analysis of the PEMFC demands the consideration of the electric potential, capillary pressure, water content, protonic potential, and liquid saturation. 14,15 The effective parameters on the degradation of the PEMFCs were evaluated using CFD analysis by Ozden et al, 16 demonstrating the impacts of the degradation on the cell's potential.…”