scholarly journals Engineered Lateral Roughness Element Implementation and Working Fluid Alteration to Intensify Hydrodynamic Cavitating Flows on a Chip for Energy Harvesting

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 49 ◽  
Author(s):  
Moein Talebian Gevari ◽  
Ali Hosseinpour Shafaghi ◽  
Luis Guillermo Villanueva ◽  
Morteza Ghorbani ◽  
Ali Koşar
Keyword(s):  
Energy Harvesting ◽  
Microfluidic Devices ◽  
Surface Cleaning ◽  
Hydrodynamic Cavitation ◽  
Working Fluid ◽  
Wall Roughness ◽  
Cavitating Flows ◽  
Roughness Elements ◽  
Fluid Alteration ◽  
On Chip

Hydrodynamic cavitation is considered an effective tool to be used in different applications, such as surface cleaning, ones in the food industry, energy harvesting, water treatment, biomedical applications, and heat transfer enhancement. Thus, both characterization and intensification of cavitation phenomenon are of great importance. This study involves design and optimization of cavitation on chip devices by utilizing wall roughness elements and working fluid alteration. Seven different microfluidic devices were fabricated and tested. In order to harvest more energy from cavitating flows, different roughness elements were used to decrease the inlet pressure (input to the system), at which cavitation inception occurs. The implemented wall roughness elements were engineered structures in the shape of equilateral triangles embedded in the design of the microfluidic devices. The cavitation phenomena were also studied using ethanol as the working fluid, so that the fluid behavior differences in the tested cavitation on chip devices were explained and compared. The employment of the wall roughness elements was an effective approach to optimize the performances of the devices. The experimental results exhibited entirely different flow patterns for ethanol compared to water, which suggests the dominant effect of the surface tension on hydrodynamic cavitation in microfluidic channels.

scholarly journals Influence of Fluid Properties on Intensity of Hydrodynamic Cavitation and Deactivation of Salmonella typhimurium

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 326 ◽  
Author(s):  
Moein Talebian Gevari ◽  
Ayhan Parlar ◽  
Milad Torabfam ◽  
Ali Koşar ◽  
Meral Yüce ◽  
...  
Keyword(s):  
Salmonella Typhimurium ◽  
Flow Behavior ◽  
Agar Plate ◽  
Microfluidic Devices ◽  
Lower Surface ◽  
Hydrodynamic Cavitation ◽  
Cavitating Flows ◽  
Roughness Elements ◽  
On Chip ◽  
General Geometry

In this study, three microfluidic devices with different geometries are fabricated on silicon and are bonded to glass to withstand high-pressure fluid flows in order to observe bacteria deactivation effects of micro cavitating flows. The general geometry of the devices was a micro orifice with macroscopic wall roughness elements. The width of the microchannel and geometry of the roughness elements were varied in the devices. First, the thermophysical property effect (with deionized water and phosphate-buffered saline (PBS)) on flow behavior was revealed. The results showed a better performance of the device in terms of cavitation generation and intensity with PBS due to its higher density, higher saturation vapor pressure, and lower surface tension in comparison with water. Moreover, the second and third microfluidic devices were tested with water and Salmonella typhimurium bacteria suspension in PBS. Accordingly, the presence of the bacteria intensified cavitating flows. As a result, both devices performed better in terms of the intensity of cavitating flow with the presence of bacteria. Finally, the deactivation performance was assessed. A decrease in the bacteria colonies on the agar plate was detected upon the tenth cycle of cavitating flows, while a complete deactivation was achieved after the fifteenth cycle. Thus, the proposed devices can be considered as reliable hydrodynamic cavitation reactors for “water treatment on chip” applications.

On “Cavitation on Chip” in Microfluidic Devices With Surface and Sidewall Roughness Elements

2019 ◽  
Vol 28 (5) ◽  
pp. 890-899 ◽  
Author(s):  
Morteza Ghorbani ◽  
Gokberk Deprem ◽  
Ece Ozdemir ◽  
Ahmad Reza Motezakker ◽  
L. Guillermo Villanueva ◽  
...  
Keyword(s):  
Microfluidic Devices ◽  
Sidewall Roughness ◽  
Roughness Elements ◽  
On Chip

Review of Microfluidic Devices for On-Chip Chemical Sensing

2016 ◽  
Vol 136 (6) ◽  
pp. 244-249
Author(s):  
Takahiro Watanabe ◽  
Fumihiro Sassa ◽  
Yoshitaka Yoshizumi ◽  
Hiroaki Suzuki
Keyword(s):  
Chemical Sensing ◽  
Microfluidic Devices ◽  
On Chip

Microfluidic Channel Fabrication With Tailored Wall Roughness

2012 ◽  
Author(s):  
Jing Ren ◽  
Sriram Sundararajan
Keyword(s):  
Flow Behavior ◽  
Surface Texturing ◽  
Microfluidic Channel ◽  
Dip Coating ◽  
Etch Depth ◽  
Wall Roughness ◽  
Random Surface ◽  
Lab On Chip ◽  
On Chip ◽  
Autocorrelation Length

Realistic random roughness of channel surfaces is known to affect the fluid flow behavior in microscale fluidic devices. This has relevance particularly for applications involving non-Newtonian fluids, such as biomedical lab-on-chip devices. In this study, a surface texturing process was developed and integrated into microfluidic channel fabrication. The process combines colloidal masking and Reactive Ion Etching (RIE) for generating random surfaces with desired roughness parameters on the micro/nanoscale. The surface texturing process was shown to be able to tailor the random surface roughness on quartz. A Large range of particle coverage (around 6% to 67%) was achieved using dip coating and drop casting methods using a polystyrene colloidal solution. A relation between the amplitude roughness, autocorrelation length, etch depth and particle coverage of the processed surface was built. Experimental results agreed reasonably well with model predictions. The processed substrate was further incorporated into microchannel fabrication. Final device with designed wall roughness was tested and proved a satisfying sealing performance.

scholarly journals Energy Harvesting in Microscale with Cavitating Flows

ACS Omega ◽  
2017 ◽  
Vol 2 (10) ◽  
pp. 6870-6877 ◽  
Author(s):  
Morteza Ghorbani ◽  
Ali Mohammadi ◽  
Ahmad Reza Motezakker ◽  
Luis Guillermo Villanueva ◽  
Yusuf Leblebici ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Cavitating Flows

A Multifunctional Microfluidic Device Based on Bifurcation Geometry

2010 ◽  
Author(s):  
Ahmed Fadl ◽  
Stefanie Demming ◽  
Zongqin Zhang ◽  
Bjo¨rn Hoxhold ◽  
Stephanus Bu¨ttgenbach ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Microfluidic Devices ◽  
Optical Lithography ◽  
Working Fluid ◽  
The Novel ◽  
Flow Rates ◽  
Single Function ◽  
Fluidic Device ◽  
Bifurcation Structures ◽  
Novel Design

Developing multifunctional devices are essential to realize more efficient Microsystems. With miniaturization processes taking place in many different applications, the rooms for single function microfluidic devices are limited. In this study, we introduce a multifunctional micro fluidic device based on bifurcation geometry which is capable of performing pumping and mixing at the same time. Optical lithography is used to fabricate the designed microfluidic device. The microfluidic device is tested at low actuator frequencies, and ethanol is employed as a working fluid. The operational principles are based on rectifying the oscillatory flows by using bifurcation structures for flow rectification. The results prove the feasibility of the novel design, and results are presented in terms of flow rates and maximum back pressures.

Versatile acoustic manipulation of micro-object using mode-switchable oscillating bubbles: transportation, trapping, rotation, and revolution

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Wei Zhang ◽  
Bin Song ◽  
Xue Bai ◽  
Lina Jia ◽  
Li Song ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Microfluidic Devices ◽  
Oscillating Bubbles ◽  
Fixed Design ◽  
On Chip

Controllable on-chip multimodal manipulation of micro-objects in microfluidic devices is urgently required for enhancing the efficiency of potential biomedical applications. However, fixed design and driving models make it difficult to...

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