Assessment of Joule heating and its effects on electroosmotic flow and electrophoretic transport of solutes in microfluidic channels

2006 ◽  
Vol 27 (3) ◽  
pp. 628-639 ◽  
Author(s):  
Gongyue Tang ◽  
Deguang Yan ◽  
Chun Yang ◽  
Haiqing Gong ◽  
John Chee Chai ◽  
...  
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Electrophoretic Transport

scholarly journals Joule heating and its effects on electroosmotic flow in microfluidic channels

2006 ◽  
Vol 34 ◽  
pp. 925-930 ◽  
Author(s):  
G Y Tang ◽  
D G Yan ◽  
C Yang ◽  
H Q Gong ◽  
C J Chai ◽  
...  
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Microfluidic Channels

JOULE HEATING INDUCED HEAT TRANSFER IN ELECTROKINETIC FLOW THROUGH MICROFLUIDIC CHANNELS

Equipment ◽  
2006 ◽  
Author(s):  
C. Yang ◽  
G. Y. Tang ◽  
D. G. Yan ◽  
H. Q. Gong ◽  
John C. Chai ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Joule Heating ◽  
Microfluidic Channels ◽  
Electrokinetic Flow ◽  
Flow Through

Solute Dispersion by Electroosmotic flow in Nonuniform Microfluidic Channels

2001 ◽  
pp. 615-616 ◽  
Author(s):  
M. T. Blom ◽  
E. F. Hasselbrink ◽  
H. Wensink ◽  
A. van den Berg
Keyword(s):  
Electroosmotic Flow ◽  
Microfluidic Channels ◽  
Solute Dispersion

scholarly journals Joule heating effects on electroosmotic flow in insulator-based dielectrophoresis

2011 ◽  
pp. n/a-n/a ◽  
Author(s):  
Sriram Sridharan ◽  
Junjie Zhu ◽  
Guoqing Hu ◽  
Xiangchun Xuan
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Heating Effects

Thermally Fully Developed Electroosmotic Flow of Power-Law Fluids in a Circular Microchannel

2013 ◽  
Vol 29 (4) ◽  
pp. 609-616 ◽  
Author(s):  
Y.-J. Sun ◽  
Y.-J. Jian ◽  
L. Chang ◽  
Q.-S. Liu
Keyword(s):  
Power Law ◽  
Joule Heating ◽  
Electroosmotic Flow ◽  
Flow Behavior ◽  
Mathematic Model ◽  
Dimensionless Temperature ◽  
Fluid Temperature ◽  
Navier Stokes Equation ◽  
Power Law Fluids ◽  
Behavior Index

ABSTRACTThis study presents a thermally fully developed electroosmotic flow of the non-Newtonian power-law fluids through a circle microchannel. A rigorous mathematic model for describing the Joule heating in an electroosmotic flow including the Poisson Boltzmann equation, the modified Navier Stokes equation and the energy equation is developed. The semi-analytical solutions of normalized velocity and temperature are derived. The velocity profile is computed by numerical integrate, and the temperature distribution is obtained by finite difference method. Results show that the velocity profiles depend greatly on the fluid behavior index n and the nondimensional electrokinetic width K. For a specified value of K, the axial velocity increases with a decrease in n, and the same trend for the effect of K on the velocity can be found for a specified value of n. Moreover, the dimensionless temperature is governed by three parameters, namely, the flow behavior index n, the nondimensional electrokinetic width K, and the dimen-sionless Joule heating parameter G. The variations of radial fluid temperature distributions with different parameters are investigated.

Fuzzy Logic Approach for Controlling Temperature in Electroosmotic Flow Fields

2009 ◽  
Author(s):  
Saeid Movahed ◽  
Mohammad Eghtesad ◽  
Reza Kamali
Keyword(s):  
Fuzzy Logic ◽  
Flow Field ◽  
Joule Heating ◽  
Electroosmotic Flow ◽  
Flow Fields ◽  
Heating Effect ◽  
Joule Heating Effect ◽  
Model Based ◽  
Fuzzy Logic Approach ◽  
Flow Field Characteristics

By entering technology to the area of micro and nano scales, the design and fabrication of miniaturized instruments such as microelectronic devices, MEMS, NEMS and ..., become very desirable. Many of these devices deal with flow field in micro- and nano-channels. By decreasing the dimensions of channels, the influence of surface effects becomes prominent and cannot be ignored. One of the most charismatic categories of these phenomena is elecrokinetic effect which can result in electroosmotic flow field (EOF) that has many advantages such as being vibration free, being much more compact, having flat-form velocity and etc. These beneficiaries lead to the increasing stimulus of using this type of flow field. Electroosmosis is defined as the motion of ionized liquid relative to the stationary charged surface by an applied electric field. One of the most important disadvantages of EOF is the Joule heating effect, the generation of heat due to the electroosmosis effect. Besides, micro- and nano-channels are usually used as heat sink in miniaturized devices. By considering these facts, it can be concluded that heat characteristics of EOF must be studied carefully in order to manage and control the Joule heating effect for utilizing the cooling characteristics of micro- and nano-channels. Flow field characteristics can be found by solving Navier-Stocks and Energy equations with proper slip boundary conditions. By considering the partial nature of these equations, many conventional model-based control techniques may not be useful. Therefore, one can suggest some non-model based strategies in order to control the properties of flow fields. In the present study, fuzzy logic controllers will be proposed in order to control the temperature and cooling characteristics of micro- and nano-channel heat sinks.

Electroosmotic Flow and Mass Species Transport in a Microcapillary Under Influences of Joule Heating

2003 ◽  
Author(s):  
Gongyue Tang ◽  
Chun Yang ◽  
Cheekiong Chai ◽  
Haiqing Gong
Keyword(s):  
Joule Heating ◽  
Electroosmotic Flow ◽  
Mathematic Model ◽  
Transfer Coefficients ◽  
Mass Transfer Equation ◽  
Buffer Solution ◽  
Species Transport ◽  
Heat Transfer Coefficients ◽  
Poisson Boltzmann ◽  
Poisson Boltzmann Equation

This study presents a numerical analysis of Joule heating effect on the electroosmotic flow and species transport, which has a direct application in the capillary electrophoresis based BioChip technology. A rigorous mathematic model for describing the Joule heating in an electroosmotic flow including Poisson-Boltzmann equation, modified Navier-Stokers equations and energy equation is developed. All these equations are coupled together through the temperature-dependent parameters. By numerically solving aforementioned equations simultaneously, the electroosmotic flow field and the temperature distributions in a cylindrical microcapillary are obtained. A systematic study is carried out under influences of different geometry sizes, buffer solution concentrations, applied electric field strengths, and heat transfer coefficients. In addition, sample species transport in a microcapillary is also investigated by numerically solving the mass transfer equation with consideration of temperature-dependant diffusion coefficient and electrophoresis mobility. The characteristics of the Joule heating, electroosmotic flow, and sample species transport in microcapillaries are discussed. The simulations reveal that the presence of the Joule heating could have a great impact on the electroosmotic flow and sample species transport.

Sign in / Sign up

Export Citation Format

Share Document