Results 31 to 40 of about 109 (96)

Study of a Fuel Supply Pump with a Piezoelectric Effect for Microdirect Alcohol Fuel Cells

International Journal of Electrochemistry, Volume 2011, Issue 1, 2011., 2011
A novel design for an ethanol injection system has been proposed, which consists of one pump chamber, two valves, and one central‐vibrating piezoelectric device. The system uses a microdiaphragm pump with a piezoelectric device for microdirect alcohol fuel cells. The diameters of the pump chamber are 31 mm and 23 mm, and the depths of the chamber are 1 
Hsiao-Kang Ma, Jyun-Sheng Wang, Wei-Yang Cheng, Shin-Han Huang, Shuangyin Wang   +4 more
wiley   +1 more source

An Integrated Pumping and Mixing Device

Journal of Fluid Science and Technology, 2011
The present work numerically characterizes a microfluidic device with pumping and mixing functions for lab-on-a- chip applications. The planar fluidic network of the device consists of two inlet channels, a pump chamber, a neck channel, and an outlet ...
Thien X. DINH, Yoshifumi OGAMI
doaj   +1 more source

The Design, Fabrication, and Testing of an Electromagnetic Micropump with a Matrix-Patterned Magnetic Polymer Composite Actuator Membrane

Micromachines, 2017
A valveless electromagnetic (EM) micropump with a matrix-patterned magnetic polymer composite actuator membrane structure was successfully designed and fabricated. The composite membrane structure is made of polydemethylsiloxane (PDMS) that is mixed with
Muzalifah Mohd Said, Jumril Yunas, Badariah Bais, Azrul Azlan Hamzah, Burhanuddin Yeop Majlis   +4 more
doaj   +1 more source

CFD Simulations of Flows in Valveless Micropumps

Engineering Applications of Computational Fluid Mechanics, 2007
AbstractIn this paper, we numerically simulated 3-dimensional transient flows in valveless micropumps, which are of a diameter of 6 mm and are driven by sine-wave voltage at frequencies from 8 to 500 Hz. The numerical simulations were conducted to study electro-mechanical coupling and fluid-structural interaction.
Q Yao, D Xu, L S Pan, A L Melissa Teo, W M Ho, V S Peter Lee, M Shabbir   +6 more
openaire   +1 more source

High-precision transdermal drug delivery enabled by a dual-pump parallel valveless piezoelectric micropump integrated with hollow microneedles

Microsystems & Nanoengineering
Transdermal drug delivery (TDD) system based on piezoelectric micropumps is a novel route of drug delivery that is wearable and highly patient-compliant. The advantage of valveless micropumps, such as their simple structure, high reliability and low cost,
Lei Zhang, Wei Sha, Yi Li, Xin Chen, Lulu Liu, Hong Hu, Jian Song, Jie Liang, Jianhua Zhang   +8 more
doaj   +1 more source

Performance Comparison of Novel Single and Bi-Diaphragm PZT Based Valveless Micropumps

Journal of Applied Fluid Mechanics, 2020
A commercial micropump should provide properties that justify the simple structure and miniaturization, high reliability, simple working principle, low cost and no need for complex controller.
H. Asadi Dereshgi, M. Z. Yildiz, N. Parlak   +2 more
doaj  

INVESTIGATION OF ELECTRO-MECHANICAL FACTORS EFFECTING PIEZOELECTRIC ACTUATOR FOR VALVELESS MICROPUMP CHARACTERISTICS [PDF]

Journal of Engineering Science and Technology, 2018
In this study, a new micropump was designed, which is suitable for medical applications regarding size and flow rate. When a micropump is used to control the amount of drug delivery, the flow rate is a key parameter and can be controlled with the ...
HAMID ASADI DERESHGI, MUSTAFA ZAHID YILDIZ   +1 more
doaj  

Lumped parameter model and numerical model of vapor bubble–driven valve-less micro-pump

Advances in Mechanical Engineering, 2017
A lumped parameter model for a vapor bubble–driven valve-less micro-pump is established, in which the mass transition process is considered, and a numerical model is built to validate it.
Yang Qu, Junjie Zhou
doaj   +1 more source

Mathematical model of a valveless micropump with a hydraulic diode

Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение"
The development of efficient valveless fluid pumping systems requires the creation of specialized models that account for directed flow transmission through hydrodiodes.
E. A. Pavlyuchenko, A. S. Pavlyuchenko
doaj   +1 more source

Proposal of a new design for valveless micropumps

Scientia Iranica, 2011
Abstract A new design for a valveless micropumping device has been proposed that integrates two existing pumping technologies, namely, the wall induced traveling wave and the obstacle-type valveless micropump. The liquid in the microchannel is transported by generating a traveling wave on the channel, while the placing of two asymmetric trapezoid ...
H. Afrasiab, M.R. Movahhedy, A. Assempour   +2 more
openaire   +1 more source