Open Discussion: Micro-Scale Flow Control & Sensing

2010 ◽  
Author(s):  
Darren Hitt ◽  
Michael Martin
Keyword(s):  
Flow Control ◽  
Micro Scale ◽  
Open Discussion

scholarly journals A NEW APPROACH FOR COMPLETE MIXING BY TRANSVERSE AND STREAMWISE FLOW MOTIONS IN MICRO-CHANNELS

2012 ◽  
Vol 19 ◽  
pp. 214-218
Author(s):  
MUH-RONG WANG ◽  
CHIAU-YI DAI ◽  
YANG-SHENG HUANG
Keyword(s):  
Flow Control ◽  
Mixing Processes ◽  
Lab On Chip ◽  
Micro Scale ◽  
Total Analysis System ◽  
Micro Channels ◽  
Control Schemes ◽  
Flow Manipulation ◽  
Analysis System ◽  
Mixing Control

Mixing control is an important issue in micro-fluid chip applications, such as μTAS (Micro-Total Analysis System) or LOC (Lab-on-Chip) because the flow at micro-scale is highly laminar. Several flow control schemes had been developed for complete mixing in the micro-channels in the past decades. However, most of the mixing control schemes are performed by utilizing specific excitation devices, such as electrokinetic, magnetic or pressure drivers. This paper investigates a new control scheme which is composed of a series of flow manipulation by changing the pressure at the two inlets of the micromixer as the external excitation. The fluids from two inlets are introduced to a square mixing chamber, which provides a space where the streamwise and transverse flow motions take place. The results show that the micromixer can be used to produce a large recirculation zone with series of small transverse fringes under external excitations. It is found that this new flow pattern enhances mixing processes at the micro-scale. A complete mixing can be achieved under appropriate flow control with the corresponding design.

scholarly journals Special Issue: Smart Flow Control in Micro Scale

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 550
Author(s):  
Jin-yuan Qian ◽  
Junhui Zhang ◽  
Zan Wu ◽  
Bengt Sunden
Keyword(s):  
Flow Control ◽  
Special Issue ◽  
Micro Scale ◽  
Control Processes ◽  
Enabling Technologies ◽  
Smart Control

Smart control processes have been proposed for many years, while for smart flow control—especially when “smart flow control” comes at the microscale—it turns out that many new innovations and enabling technologies are possible [...]

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

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