Numerical simulation of a 2D electrothermal pump by lattice Boltzmann method on GPU

Ren, Qinlong; Chan, Cho Lik

doi:10.1080/10407782.2015.1090826

Cited by 14 publications

(8 citation statements)

References 34 publications

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“…In the current work, using perturbation method, the variation of permittivity ε and electrical conductivity σ are approximated by a linear function of temperature T as:

\begin{matrix} left δ_{ε} = \frac{1}{ε} \frac{d ε}{d T}, δ_{σ} = \frac{1}{σ} \frac{d σ}{d T}, \\ left ε = ε_{r} ([], 1 + δ_{ε} ((), T - T_{r})), \\ left σ = σ_{r} ([], 1 + δ_{σ} ((), T - T_{r})) \end{matrix}

where ε r is the reference permittivity, σ r is the reference electrical conductivity, and T r is the reference temperature. As is well known, the ACET pumping of aqueous solution is independent of AC voltage frequency before its crossover value in the range where the Coulomb force is dominant . However, the dielectric property of blood is highly frequency dependent which makes the pumping phenomenon of blood flow complicated .…”

Section: Methodsmentioning

confidence: 99%

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Investigation of pumping mechanism for non‐Newtonian blood flow with AC electrothermal forces in a microchannel by hybrid boundary element method and immersed boundary‐lattice Boltzmann method

Ren

2018

Electrophoresis

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Efficient pumping of blood flow in a microfluidic device is essential for rapid detection of bacterial bloodstream infections (BSI) using alternating current (AC) electrokinetics. Compared with AC electro-osmosis (ACEO) phenomenon, the advantage of AC electrothermal (ACET) mechanism is its capability of pumping biofluids with high electrical conductivities at a relatively high AC voltage frequency. In the current work, the microfluidic pumping of non-Newtonian blood flow using ACET forces is investigated in detail by modeling its multi-physics process with hybrid boundary element method (BEM) and immersed boundary-lattice Boltzmann method (IB-LBM). The Carreau-Yasuda model is used to simulate the realistic rheological behavior of blood flow. The ACET pumping efficiency of blood flow is studied in terms of different AC voltage magnitudes and frequencies, thermal boundary conditions of electrodes, electrode configurations, channel height, and the channel length per electrode pair. Besides, the effect of rheological behavior on the blood flow velocity is theoretically analyzed by comparing with the Newtonian fluid flow using scaling law analysis under the same physical conditions. The results indicate that the rheological behavior of blood flow and its frequency-dependent dielectric property make the pumping phenomenon of blood flow different from that of the common Newtonian aqueous solutions. It is also demonstrated that using a thermally insulated electrode could enhance the pumping efficiency dramatically. Besides, the results conclude that increasing the AC voltage magnitude is a more economical pumping approach than adding the number of electrodes with the same energy consumption when the Joule heating effect is acceptable.

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“…In the current work, using perturbation method, the variation of permittivity ε and electrical conductivity σ are approximated by a linear function of temperature T as:

\begin{matrix} left δ_{ε} = \frac{1}{ε} \frac{d ε}{d T}, δ_{σ} = \frac{1}{σ} \frac{d σ}{d T}, \\ left ε = ε_{r} ([], 1 + δ_{ε} ((), T - T_{r})), \\ left σ = σ_{r} ([], 1 + δ_{σ} ((), T - T_{r})) \end{matrix}

Section: Methodsmentioning

confidence: 99%

“…As is well known, the ACET pumping of aqueous solution is independent of AC voltage frequency before its crossover value in the range where the Coulomb force is dominant [42]. However, the dielectric property of blood is highly frequency dependent which makes the pumping phenomenon of blood flow complicated [43,44].…”

Section: Methodsmentioning

confidence: 99%

Investigation of pumping mechanism for non‐Newtonian blood flow with AC electrothermal forces in a microchannel by hybrid boundary element method and immersed boundary‐lattice Boltzmann method

Ren

2018

Electrophoresis

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“…Finally, the data on the GPU should be copied to the host memory of CPU for printing at any specific time when the results are needed. During the recent years, LBM is demonstrated to be appropriate for GPU computing [147][148][149][150][151], and it has been applied to solve several different physical problems [152][153][154][155].…”

Section: Gpu Accelerationmentioning

confidence: 99%

Heat Transfer Enhancement Technique of PCMs and Its Lattice Boltzmann Modeling

Qu¹

2019

Thermal Energy Battery With Nano-Enhanced PCM

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Phase change materials (PCMs) have several advantages for thermal energy storage due to their high energy storage density and nearly constant working temperature. Unfortunately, the low thermal conductivity of PCM impedes its efficiency of charging and discharging processes. To solve this issue, different techniques are developed to enhance the heat transfer capability of PCMs. In this chapter, the common approaches, which include the use of extended internal fins, porous matrices or metal foams, high thermal conductivity nanoparticles, and heat pipes for enhancing the heat transfer rate of PCMs, are presented in details. In addition, mathematical modeling plays a significant role in clarifying the PCM melting and solidification mechanisms and directs the experiments. As a powerful mesoscopic numerical approach, the enthalpy-based lattice Boltzmann method (LBM), which is robust to investigate the solid-liquid phase change phenomenon without iteration of source terms, is also introduced in this chapter, and its applications in latent heat thermal energy storage (LHTES) unit using different heat transfer enhancement techniques are discussed.

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“…ACET flow is effective for driving high-electricalconductivity fluid (above 0.002 S m −1 ) at high AC voltage frequency (above 100 kHz) making it attractive in biomedical lab-on-a-chip devices. For the purpose of improving the fluid pumping efficiency, an ACET micropump has been investigated by several studies with respect to electrode configuration [11], AC voltage signal [12], electrolyte properties [13], thermal boundary conditions [14], and the use of thin-film resistive heaters [15]. In the aforementioned efforts, the ACET phenomenon was always applied to drive the physiological liquid sample in a microfluidic device for point-of-care diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Continuous trapping of bacteria in non-Newtonian blood flow using negative dielectrophoresis with quadrupole electrodes

Ren

Liang

Wang

et al. 2020

J. Phys. D: Appl. Phys.

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Efficient trapping of bacteria from whole blood is essential for point-of-care diagnostics of sepsis at an early stage in order to reduce morbidity and mortality. However, low bacteria concentration and the presence of blood cells hinder the trapping efficiency of bacteria from whole blood. As red blood cells comprise 94.9% of total blood cells, lysing the red blood cells using saponin could effectively attenuate the influence of the blood component on the bacteria-trapping process. In this situation, long-range bacteria trapping from whole blood using a hybrid electrokinetic based lab-on-a-chip device becomes promising. In this paper, through developing a multi-physical lattice Boltzmann method with Langevin dynamics, the continuous trapping process of S. aureus in a microfluidic channel with quadrupole electrodes under combined alternating-current electrothermal electrohydrodynamic force and negative dielectrophoresis force is numerically investigated and optimized at various parametric conditions. Based on the statistical data, a stable bacteria recovery rate of 68.4%–74.5% is successfully achieved with respect to different bacteria densities under appropriate operational conditions of the designed lab-on-a-chip device. The current work demonstrates the potential of continuous bacteria trapping from whole blood using hybrid electrokinetic phenomena.

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Numerical simulation of a 2D electrothermal pump by lattice Boltzmann method on GPU

Cited by 14 publications

References 34 publications

Investigation of pumping mechanism for non‐Newtonian blood flow with AC electrothermal forces in a microchannel by hybrid boundary element method and immersed boundary‐lattice Boltzmann method

Investigation of pumping mechanism for non‐Newtonian blood flow with AC electrothermal forces in a microchannel by hybrid boundary element method and immersed boundary‐lattice Boltzmann method

Heat Transfer Enhancement Technique of PCMs and Its Lattice Boltzmann Modeling

Continuous trapping of bacteria in non-Newtonian blood flow using negative dielectrophoresis with quadrupole electrodes

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