Microscale Flows

2019 ◽  
pp. 25-80
Author(s):  
Amit Agrawal ◽  
Hari Mohan Kushwaha ◽  
Ravi Sudam Jadhav
Keyword(s):  
Microscale Flows

Advanced particle-based velocimetry techniques for microscale flows

2009 ◽  
Vol 6 (5) ◽  
pp. 577-588 ◽  
Author(s):  
Sang Joon Lee ◽  
Seok Kim
Keyword(s):  
Microscale Flows

Effects of Interfacial Interactions Between Fluid and Solid Wall on Microscale Flows

2006 ◽  
Author(s):  
Xingang Liang
Keyword(s):  
Heat Transfer ◽  
Solid Wall ◽  
Mean Free Path ◽  
Characteristic Size ◽  
Interfacial Interactions ◽  
Interfacial Effects ◽  
Flow And Heat Transfer ◽  
Microscale Flow ◽  
Flow Phenomena ◽  
Microscale Flows

This work discusses the interfacial effects on flow and heat transfer at micro/nano scale. Different from bulk cases where interfaces can be simply treated as a boundary, the interfacial effects are not limited to the interface at microscale but extend into a significant, even the whole domain of the flow and heat transfer field when the characteristic size of the domain is close to the mean free path (MFP) of fluid particles. Most of microscale flow phenomena result from interfacial interactions. Any changes in the interactions between the fluid and solid wall particles could affect the flow and heat transfer characteristics, such as flow and temperature profiles, friction coefficient. The interactions depend on many parameters, such as the force between fluid and solid wall particles, microstructure of interfaces. The flow and heat transfer features does not only depend on the fluid itself, but also on the interaction with the solid wall because the interface impact can go deep inside the flow. Same fluid, same channel shape but different wall materials could have different flow characters.

Measurements of Microjet Cooling and Phase Change Characteristics Using Microcantilever Heaters

2007 ◽  
Author(s):  
Jungchul Lee ◽  
Hanif Hunter ◽  
Fabian Goericke ◽  
Nisarga Naik ◽  
Mark Allen ◽  
...  
Keyword(s):  
Phase Change ◽  
Convective Heat ◽  
Temporal Resolution ◽  
Heat Fluxes ◽  
Microcantilever Sensors ◽  
Change Characteristics ◽  
Microscale Flows

This paper reports novel microcantilever metrology tools to investigate free microjets emanating from a micromachined nozzle having 10 μm diameter. Microcantilever sensors are well-suited to interrogate these flows due to their high spatial and temporal resolution. In this work, microcantilevers with integrated piezoresistors have been used to detect the breakup distance of free microjets, and microcantilevers with integrated resistive heaters have been applied to study microjet cooling and phase change characteristics. Measured microjet thrusts were in the range of 10 – 60 μN and heat fluxes were measured in the range of 25 – 350 °C. The convective heat fluxes by microjet impingement boiling were estimated at 2.9 – 7.6 kW/cm2. The techniques reported herein are promising to characterize microscale flows.

Application of Gaussian Moment Closure to Microscale Flows with Moving Embedded Boundaries

AIAA Journal ◽  
2014 ◽  
Vol 52 (9) ◽  
pp. 1839-1857 ◽  
Author(s):  
J. G. McDonald ◽  
J. S. Sachdev ◽  
C. P. T. Groth
Keyword(s):  
Moment Closure ◽  
Microscale Flows ◽  
Gaussian Moment ◽  
Embedded Boundaries ◽  
Gaussian Moment Closure

Experimental and numerical investigation of pressure-driven microscale flows of polymer melts: New approach

2014 ◽  
Vol 58 (2) ◽  
pp. 467-492
Author(s):  
Serife Akkoyun ◽  
Claire Barrès ◽  
Yves Béreaux ◽  
Benoît Blottière ◽  
Jean-Yves Charmeau
Keyword(s):  
Numerical Investigation ◽  
Polymer Melts ◽  
New Approach ◽  
Microscale Flows ◽  
Pressure Driven

Parametric Study of Rarefaction Effects on Micro- and Nanoscale Thermal Flows in Porous Structures

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
A. H. Meghdadi Isfahani
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Knudsen Number ◽  
Porous Structures ◽  
Knudsen Flow ◽  
Wide Range ◽  
Microscale Flows ◽  
Boltzmann Method ◽  
Thermal Flows ◽  
Rarefaction Effects

Hydrodynamics and heat transfer in micro/nano channels filled with porous media for different porosities and Knudsen numbers, Kn, ranging from 0.1 to 10, are considered. The performance of standard lattice Boltzmann method (LBM) is confined to the microscale flows with a Knudsen number less than 0.1. Therefore, by considering the rarefaction effect on the viscosity and thermal conductivity, a modified thermal LBM is used, which is able to extend the ability of LBM to simulate wide range of Knudsen flow regimes. The present study reports the effects of the Knudsen number and porosity on the flow rate, permeability, and mean Nusselt number. The Knudsen's minimum effect for micro/nano channels filled with porous media was observed. In addition to the porosity and Knudsen number, the obstacle sizes have important role in the heat transfer, so that enhanced heat transfer is observed when the obstacle sizes decrease. For the same porosity and Knudsen number, the inline porous structure has the highest heat transfer performance.

A Review of Laminar Single-Phase Flow in Microchannels

2001 ◽  
Author(s):  
Ian Papautsky ◽  
Tim Ameel ◽  
A. Bruno Frazier
Keyword(s):  
Fluid Flow ◽  
Single Phase ◽  
Experimental Investigations ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Research Activities ◽  
Internal Fluid ◽  
Internal Fluid Flow ◽  
Microscale Flows ◽  
New Applications

Abstract Microfluidics plays a major role in the development of many innovative research activities aimed at the development of miniaturized devices and systems, and new applications related to microscale handling of fluids. As the field of microfluidics continues to grow, it is becoming increasingly important to understand the mechanisms and fundamental differences involved in microscale fluid flow. This paper presents a summary of the experimental research efforts in the area of microscale single-phase internal fluid flow and discusses issues associated with investigating microscale flows. While the currently available experimental data indicate the presence of microscale phenomena, they do not unequivocally identify the effects. There is a clear need for additional experimental investigations.

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