Analytical and Numerical Study of Joule Heating Effects on Electrokinetically Pumped Continuous Flow PCR Chips

Langmuir ◽  
2008 ◽  
Vol 24 (6) ◽  
pp. 2938-2946 ◽  
Author(s):  
Lin Gui ◽  
Carolyn L. Ren
Keyword(s):  
Joule Heating ◽  
Continuous Flow ◽  
Numerical Study ◽  
Heating Effects

scholarly journals Numerical Study of Joule Heating Effects on Microfluidics Device Reliability in Electrode Based Devices

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5819
Author(s):  
Caffiyar Mohammed Yousuff ◽  
Vineet Tirth ◽  
Mohamed Zackria Ansar Babu Irshad ◽  
Kashif Irshad ◽  
Ali Algahtani ◽  
...  
Keyword(s):  
Cross Sections ◽  
Joule Heating ◽  
Electrode Materials ◽  
Separation Efficiency ◽  
Numerical Study ◽  
Microfluidic Devices ◽  
Cell Loss ◽  
Heating Effects ◽  
Device Reliability ◽  
Micro Channels

In electrode-based microfluidic devices, micro channels having narrow cross sections generate undesirable temperature inside the microfluidic device causing strong thermal distribution (joule heating) that eventually leads to device damage or cell loss. In this work, we investigate the effects of joule heating due to different electrode configuration and found that, electrodes with triangular arrangements produce less heating effect even at applied potential of 30 V, without compromising the performance of the device and separation efficiency. However, certain electrode materials have low thermal gradients but erode the channel quickly thereby affecting the reliability of the device. Our simulation also predicts optimal medium conductivity (10 mS/m with 10 V) for cells to survive inside the channel until they are selectively isolated into the collection outlet. Our investigations will aid the researchers in the designing of efficient and reliable microfluidic devices to overcome joule heating inside the microchannels.

The Joule Heating Effects on Natural Convection of Participating Magnetohydrodynamics Under Different Levels of Thermal Radiation in a Cavity

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Jing-Kui Zhang ◽  
Ben-Wen Li ◽  
Yuan-Yuan Chen
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Thermal Radiation ◽  
Joule Heating ◽  
Numerical Study ◽  
Discrete Ordinates ◽  
Flow And Heat Transfer ◽  
Heating Effects ◽  
Different Temperatures ◽  
Different Levels

A numerical study is conducted for the Joule heating effects on fluid flow and heat transfer of radiatively participating magnetohydrodynamics (MHD) under different levels of thermal radiation considering the Hall effects in a square cavity. In the cavity, the vertical walls are isothermal with constant but different temperatures, while the horizontal walls are adiabatic. The absorption, emission, and scattering of the fluid and the reflection, absorption, and emission of the walls are all taken into account. The governing equations for momentum and energy together with the boundary conditions are solved by the finite volume method (FVM), while the governing equation for radiative transfer is solved by the discrete ordinates method (DOM). Tabular and graphical results are presented in terms of streamlines, isotherms, Nusselt number, and the average temperature of the fluid. After detailed analysis, we found that the Joule heating has notable effects on fluid flow and heat transfer in the cavity and Joule heating cannot be neglected in certain range of parameters.

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