Biofouling-resistant tubular fluidic devices with magneto-responsive dynamic walls

Geonjun Choi; Hangil Ko; Hyejin Jang; Insol Hwang; Minho Seong; Kahyun Sun; Hyun-Ha Park; Tae-Eun Park; Jangho Kim; Hoon Eui Jeong

doi:10.1039/d0sm01979h

Fabrication of LTCC Micro-fluidic Devices For Wireless Lab-On-A-Chip Applications

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/2016cicmt-wa12 ◽

2016 ◽

Vol 2016 (CICMT) ◽

pp. 000085-000088

Author(s):

Achraf Ben Amar ◽

Houssem Eddine Amor ◽

Hung Cao ◽

Ammar B. Kouki

Keyword(s):

Microfluidic Channel ◽

Lab On A Chip ◽

Dielectric Materials ◽

Capacitance Measurement ◽

Fluid Identification ◽

Sensing Systems ◽

Microfluidic Chamber ◽

Micro Channels ◽

Fluidic Devices ◽

Electrical Permittivity

Abstract Low temperature co-fired ceramic (LTCC) based microfluidic sensors have been developed for biomedical and environmental sensing systems. This paper introduces a microfluidic chamber based on impedance spectroscopy measurements using LTCC technology for wireless Lab-On-A-Chip (LOC) applications. To overcome the channel sagging during the fabrication process, we used sacrificial carbon tapes as solid inserts, thus guiding the LTCC to follow their shape upon lamination and then formed micro-channels. The measurement chamber was a parallel-plate capacitive structure with 85 μm gap. This platform requires a small fluid sample of less than 4 μL. The sensor formed by the microfluidic channel and capacitance structure was characterized using different dielectric materials such as air, water and acetone. We hereby present the capability of LTCC-based systems in fluid identification by detecting their electrical permittivity using capacitance measurement.

Download Full-text

Jet thrust vectoring using a miniature fluidic oscillator

The Aeronautical Journal ◽

10.1017/s0001924000000634 ◽

2005 ◽

Vol 109 (1093) ◽

pp. 129-138 ◽

Cited By ~ 22

Author(s):

G. Raman ◽

S. Packiarajan ◽

G. Papadopoulos ◽

C. Weissman ◽

S. Raghu

Keyword(s):

Mass Flow ◽

Near Field ◽

Wave Form ◽

Thrust Vectoring ◽

Fluidic Oscillator ◽

Flow Mixing ◽

Fluidic Devices ◽

Spatially Distributed ◽

Fluidic Device ◽

Fluidic Actuators

Abstract This paper presents a new approach to vectoring jet thrust using a miniature fluidic actuator that provided spatially distributed mass addition. The fluidic actuators used had no moving parts and produced oscillatory flow with a square wave form at frequencies up to 1·6kHz. A subsonic jet with an exit diameter of 3·81cm was controlled using single and dual fluidic actuators, each with an equivalent circular diameter of 1·06mm. The fluidic nozzle was operated at pressures between 20·68 and 165·47kPa. The objectives of the present work included documentation of the actuation characteristics of fluidic devices, assessment of the effectiveness of fluidic devices for jet thrust vectoring, and evaluation of mass flow requirements for vectoring under various conditions. Measurements were made in the flow field using a pitot probe for the vectored and unvectored cases. Some acoustic measurements were made using microphones in the near-field and for selected cases particle image velocimetry (PIV) measurements were made. Thrust vectoring was obtained in low speed jets by momentum effects with fluidic device mass flow rates of only 2 × 10–4kg/sec (0·6% of main jet mass flow per fluidic oscillator). Although a single fluidic device produced vectoring of the primary jet, the dual fluidic device configuration (with two fluidic devices on either side of the jet exit) produced mass flux enhancement of 28% with no vectoring. Our results indicate that fluidic actuators have the potential for use in thrust vectoring, flow mixing and industrial flow deflection applications.

Download Full-text

Numerical Investigation of Dynamic Characteristics of a Fluidic Device

Volume 5C: Heat Transfer ◽

10.1115/gt2015-43601 ◽

2015 ◽

Author(s):

Bharat Koli ◽

John W. Chew ◽

Nick J. Hills ◽

Timothy Scanlon

Keyword(s):

Dynamic Characteristics ◽

Control Flow ◽

Low Flow ◽

Flow State ◽

Controlling Parameter ◽

Fluidic Devices ◽

Fluidic Device ◽

Unsteady Interaction ◽

Control Port ◽

Cooling Air

Fluidic devices are of interest with turbomachinery internal air systems for modulation of cooling air and other applications. Generally, the flow states within a fluidic device are switched by control flow or flows. For most fluidic devices the switching procedure is almost instantaneous and hence it is difficult to characterize the performance of a device experimentally. The objective of this research is to numerically investigate the dynamic characteristics of a control flow operated fluidic device. In this study the dynamic characteristics of a nozzle during switching is considered. The simulations considered the unsteady interaction of the control flow with the nozzle jet for two different switching scenarios namely, switching of high to low flow state and vice versa. The magnitude of static pressure applied at the control port was identified as a controlling parameter and had to be below a critical value to achieve stable switching. The CFD solutions show that this is related to the flow physics and critical momentum flux ratios for switching are calculated for the present device.

Download Full-text

Coupled Fluidic Vibration Isolators for Rotorcraft Pitch Link Loads Reduction

Volume 1: 24th Conference on Mechanical Vibration and Noise, Parts A and B ◽

10.1115/detc2012-70174 ◽

2012 ◽

Author(s):

Nicolas A. Kurczewski ◽

Lloyd H. Scarborough ◽

Christopher D. Rahn ◽

Edward C. Smith

Keyword(s):

Harmonic Excitation ◽

Wide Frequency Range ◽

Rotor Speed ◽

Frequency Range ◽

Vibration Isolators ◽

Transmitted Force ◽

Fluidic Devices ◽

Fluidic Device ◽

Multiple Frequencies ◽

Blade Loads

Replacing rigid pitch links on rotorcraft with coupled fluidic devices has the potential to reduce the aerodynamic blade loads transmitted from the blade root to the swashplate. An analytical model of two coupled fluidic isolators is derived and experimentally validated for even and odd harmonic pitch link loads. The system consists of two elastomeric pumpers with fluid chambers that are coupled by an inertia track. This passive fluidic device can be tuned to reduce the transmitted force at a particular odd harmonic of the rotor speed by tailoring the fluid inertance in the inertia track. Benchtop experimental results agree with theory, demonstrating a reduction in odd harmonic pitch link loads of up to 90% compared to the system without fluid. The coupled fluidic isolators also significantly reduce transmitted loads relative to a rigid pitch link over a wide frequency range. Simulation of a UH-60 Blackhawk retrofit example shows potential for targeted odd harmonic excitation loads reduction up to 94% for multiple frequencies without affecting the even harmonic excitation response.

Download Full-text

3D-printed fluidic devices enable quantitative evaluation of blood components in modified storage solutions for use in transfusion medicine

The Analyst ◽

10.1039/c3an02357e ◽

2014 ◽

Vol 139 (13) ◽

pp. 3219-3226 ◽

Cited By ~ 49

Author(s):

Chengpeng Chen ◽

Yimeng Wang ◽

Sarah Y. Lockwood ◽

Dana M. Spence

Keyword(s):

3D Printer ◽

Transfusion Medicine ◽

Blood Components ◽

Storage Solutions ◽

Fluidic Devices ◽

Plate Reader ◽

Fluidic Device ◽

Standard Plate ◽

3D Printed ◽

Stored Blood

A fluidic device constructed with a 3D-printer can be used to investigate stored blood components with subsequent high-throughput calibration and readout with a standard plate reader.

Download Full-text