Faculty Opinions recommendation of Joule heating and heat transfer in poly(dimethylsiloxane) microfluidic systems.

Electrokinetic pumping is commonly used as a mechanism for species transport in microfluidic systems. Joule heating, caused by current flow through the buffer solution during electroosmotic flow, can lead to significant increases in the system temperature which can be detrimental to electrophoretic separations and temperature sensitive chemical reactions. In this paper, a combined experimental and numerical approach was used to examine Joule heating and heat transfer at a T intersection for PDMS/PDMS and PDMS/Glass hybrid microfluidic systems. In general it was found the PDMS/Glass chips maintained a more uniform and lower buffer temperature than the PDMS/PDMS systems, since the internally generated heat could be transferred more efficiently (due to the higher thermal conductivity of the glass component) from the channel network to the room temperature reservoir. This increase in temperature was shown to significantly increase the current load and the volume flow rate through the PDMS/PDMS system.

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Joule heating and heat transfer in poly(dimethylsiloxane) microfluidic systems

Lab on a Chip ◽

10.1039/b306158b ◽

2003 ◽

Vol 3 (3) ◽

pp. 141 ◽

Cited By ~ 188

Author(s):

David Erickson ◽

David Sinton ◽

Dongqing Li

Keyword(s):

Heat Transfer ◽

Joule Heating ◽

Microfluidic Systems

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JOULE HEATING INDUCED HEAT TRANSFER IN ELECTROKINETIC FLOW THROUGH MICROFLUIDIC CHANNELS

Equipment ◽

10.1615/ihtc13.p8.210 ◽

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

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Simultaneous impacts of Joule heating and variable heat source/sink on MHD 3D flow of Carreau-nanoliquids with temperature dependent viscosity

Nonlinear Engineering ◽

10.1515/nleng-2017-0132 ◽

2019 ◽

Vol 8 (1) ◽

pp. 356-367 ◽

Cited By ~ 5

Author(s):

J. V. Ramana Reddy ◽

V. Sugunamma ◽

N. Sandeep

Keyword(s):

Heat Transfer ◽

Heat Source ◽

Joule Heating ◽

Uniform Space ◽

Weissenberg Number ◽

Physical Parameters ◽

Temperature Dependent ◽

3D Flow ◽

Temperature Dependent Viscosity ◽

Source Sink

Abstract The 3D flow of non-Newtonian nanoliquid flows past a bidirectional stretching sheet with heat transfer is investigated in the present study. It is assumed that viscosity of the liquid varies with temperature. Carreau non-Newtonain model, Tiwari and Das nanofluid model are used to formulate the problem. The impacts of Joule heating, nonlinear radiation and non-uniform (space and temperature dependent) heat source/sink are accounted. Al-Cu-CH3OH and Cu-CH3OH are considered as nanoliquids for the present study. The solution of the problem is attained by the application of shooting and R.K. numerical procedures. Graphical and tabular illustrations are incorporated with a view of understanding the influence of various physical parameters on the flow field. We eyed that using of Al-Cu alloy nanoparticles in the carrier liquid leads to superior heat transfer ability instead of using only Aluminum nanoparticles. Weissenberg number and viscosity parameter have inclination to exalt the thermal field.

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Mixed Electroosmotic Pressure Driven Flow and Heat Transfer of Power Law Fluid in a Hydrophobic Microchannel

Volume 1B, Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods ◽

10.1115/fedsm2017-69525 ◽

2017 ◽

Cited By ~ 1

Author(s):

Ainul Haque ◽

Ameeya Kumar Nayak

Keyword(s):

Heat Transfer ◽

Power Law ◽

Joule Heating ◽

Scientific Data ◽

Channel Height ◽

Flow And Heat Transfer ◽

Power Law Fluids ◽

Hydrophobic Microchannel ◽

Pressure Driven Flow ◽

Pressure Driven

In this paper, a mathematical model has been developed to analyze the combined electroosmotic and pressure driven flow of power law fluids in a micro channel in the presence of Joule heating effects. The effects of Navier slip boundary condition and thermal radiation is examined for effective heat transfer in a hydrophobic microchannel. The analytical treatment has been performed for fluid flow and heat transfer effects in terms of flow governing parameters. This study highlights the effect of channel height to the electric double layer thickness and observed the flow variation due to heat transfer effect with the available scientific data. For a pure EOF, velocity slip have more significant role to get a maximum flow rate as expected. For both pseudo-plastic and dilatent fluids Nusselt number is decreased with the increment of the hydrophobic parameter and dimensionless pressure gradient where as increment in Joule heating effect enhance the heat transfer rate.

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Magnetogasdynamic Flow and Heat Transfer in a Microchannel

ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 1 ◽

10.1115/icnmm2011-58221 ◽

2011 ◽

Author(s):

Huei Chu Weng

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Joule Heating ◽

Electromagnetic Force ◽

Gas Flow ◽

Velocity Slip ◽

Flow And Heat Transfer ◽

Electric And Magnetic Field ◽

Flow Through ◽

Flow Drag

The presence of current flow in an electric and magnetic field results in electromagnetic force and joule heating. It is desirable to understand the roles of electromagnetic force and joule heating on gas microflow and heat transfer. In this study, a mathematical model is developed of the pressure-driven gas flow through a long isothermally heated horizontal planar microchannel in the presence of an external electric and magnetic field. The solutions for flow and thermal field and characteristics are derived analytically and presented in terms of dimensionless parameters. It is found that an electromagnetic driving force can be produced by a combined non-zero electric field and a negative magnetic field and results in an additional velocity slip and an additional flow drag. Also, a joule heating can be enhanced by an applied positive magnetic field and therefore results in an additional temperature jump and an additional heat transfer.

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Mixed convective hybrid nanofluid flow in lid-driven undulated cavity: effect of MHD and Joule heating

Journal of Naval Architecture and Marine Engineering ◽

10.3329/jname.v16i2.40585 ◽

2019 ◽

Vol 16 (2) ◽

pp. 109-126 ◽

Cited By ~ 2

Author(s):

Ishrat Zahan ◽

R Nasrin ◽

M A Alim

Keyword(s):

Heat Transfer ◽

Nusselt Number ◽

Heat Transfer Rate ◽

Joule Heating ◽

Transfer Rate ◽

Volume Fraction ◽

Solid Volume Fraction ◽

Hybrid Nanoparticles ◽

Wave Number ◽

Hybrid Nanofluid

A numerical analysis has been conducted to show the effects of magnetohydrodynamic (MHD) and Joule heating on heat transfer phenomenon in a lid driven triangular cavity. The heat transfer fluid (HTF) has been considered as water based hybrid nanofluid composed of equal quantities of Cu and TiO2 nanoparticles. The bottom wall of the cavity is undulated in sinusoidal pattern and cooled isothermally. The left vertical wall of the cavity is heated while the inclined side is insulated. The two dimensional governing partial differential equations of heat transfer and fluid flow with appropriate boundary conditions have been solved by using Galerkin's finite element method built in COMSOL Multyphysics. The effects of Hartmann number, Joule heating, number of undulation and Richardson number on the flow structure and heat transfer characteristics have been studied in details. The values of Prandtl number and solid volume fraction of hybrid nanoparticles have been considered as fixed. Also, the code validation has been shown. The numerical results have been presented in terms of streamlines, isotherms and average Nusselt number of the hybrid nanofluid for different values of governing parameters. The comparison of heat transfer rate by using hybrid nanofluid, Cu-water nanofluid, TiO2 -water nanofluid and clear water has been also shown. Increasing wave number from 0 to 3 enhances the heat transfer rate by 16.89%. The enhanced rate of mean Nusselt number for hybrid nanofluid is found as 4.11% compared to base fluid.

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Effect of Wall Electrical Conductance on Magnetohydrodynamic Heat Transfer in a Channel

Journal of Heat Transfer ◽

10.1115/1.3686127 ◽

1963 ◽

Vol 85 (4) ◽

pp. 371-377 ◽

Cited By ~ 14

Author(s):

J. T. Yen

Keyword(s):

Heat Transfer ◽

Heat Flux ◽

Boundary Conditions ◽

Viscous Dissipation ◽

Joule Heating ◽

Electrical Conductance ◽

Wall Heat Flux ◽

Constant Wall Heat Flux

Effect of wall electrical conductance on laminar fully developed magnetohydrodynamic heat transfer in a channel with constant wall heat flux and exact magnetohydrodynamic boundary conditions are investigated. For channels with insulated walls, viscous dissipation is more important than joule heating for all Ec and M. For sufficiently large wall conductance, viscous dissipation is dominated by joule heating for all Ec, if M is large enough; both are in turn dominated by wall heat flux if Ec is large enough for all M. These and other conclusions are discussed in this paper.

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