Numerical Analysis and Optimization of Miniature Electrohydrodynamic Air Blowers

Ramadhan, Abdulmajeed A.; Kapur, Nikil; Summers, J. L.; Thompson, H. M.

doi:10.1109/tps.2017.2755365

Cited by 14 publications

(11 citation statements)

References 39 publications

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“…Symmetry boundary conditions were applied at the horizontal plane centered between the channel walls and at one of the channel sidewalls of the 3D simulation domain. The numerical solution procedure, modelling parameters, and boundary conditions applied to the present numerical model for electrostatics, charge transport, and fluid dynamics, are adopted as described in [28] for the same channel geometry. The space charge density generation is modelled by applying Kaptsov's assumption [29] and using Peek's equation [30] at standard air conditions (the relative air density = the roughness factor of the wire surface = 1) to estimate the electric field strength created at the surface of the positive corona electrode.…”

Section: Validation Of the Numerical Methodsmentioning

confidence: 99%

“…A simple structure of a plate-fin heat sink is employed as the heat exchange surface and acts as the collector electrode of the integrated EHD blower. The fin spacing of the heat sink is fixed at 2 mm to be within the range of channel thicknesses used in the design optimization study of miniature EHD air blowers presented in [28]. A set of fine wires of 0.025-mm-diameter are positioned vertically within the flow direction upstream of the grounded heat sink.…”

Section: Numerical Configurationmentioning

confidence: 99%

“…A set of fine wires of 0.025-mm-diameter are positioned vertically within the flow direction upstream of the grounded heat sink. Each wire is centered halfway between two successive collecting fins and located at a fixed distance of 1 mm from the edges of the fins and heat sink base, which is the optimal electrode gap predicted for a channel of 2 mm thickness at a constant operating power [28]. The material of the heat sink is assumed to be Aluminium with a thermal conductivity of 200 W/m.K.…”

Section: Numerical Configurationmentioning

confidence: 99%

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Numerical development of EHD cooling systems for laptop applications

Ramadhan

Kapur

Summers

et al. 2018

Applied Thermal Engineering

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Electrohydrodynamic (EHD) air blowers are uniquely positioned to overcome the limitations of miniaturized mechanical fans in small-scale and consumer electronic devices. A novel cooling system design using optimized EHD blowers integrated with a plate-fin heat sink is presented and proposed for thin consumer electronics such as laptop applications. A three-dimensional (3D) numerical model is developed and validated to solve the coupled equations of EHD flow and conjugate heat transfer and predict the cooling performance of the integrated EHD system. For a range of heat sink heights from 6 to 12 mm, a parametric study is performed to investigate the influence of geometric parameters and operating conditions on the thermal performance of the EHD systems based on heat sink thermal resistance and the highest operating temperature. Numerical results demonstrate that the proposed EHD cooling system is able to provide effective cooling performance and maintain the temperature within the safe and typical operating range. Under a range of thermal design power (TDP) up to 30 W, trends of predicted operating temperatures show that the developed EHD cooling systems have great potential to compete with mechanical blowers in low-profile laptops with higher TDP, lower device height and reduced installation volume compared to a selected list of current standard laptops available commercially.

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Section: Validation Of the Numerical Methodsmentioning

confidence: 99%

Section: Numerical Configurationmentioning

confidence: 99%

Section: Numerical Configurationmentioning

confidence: 99%

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Numerical development of EHD cooling systems for laptop applications

Ramadhan

Kapur

Summers

et al. 2018

Applied Thermal Engineering

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“…Its goal was to evaluate the electrohydrodynamic fluid for its application to create EHD blowers which could substitute traditional mechanical fans. Kalman et al [28], Rashkovan et al [29] and Ramadhan et al [30,31] focused on optimizing the wire-plane configuration to be incorporated in an EHD blower with the aim of refrigerating electronic components and enhancing their efficiency. A mathematical and computational 2D and 3D model of this electrode configuration was developed under different conditions of electrode gap and applied voltage in order to determine an optimal design for use in heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Evaluation of Innovative Wire-to-Plane Fins’ Configuration for Atmosphere Corona-Discharge Cooling Devices

Cogollo

Balsalobre²,

Lantada

et al. 2020

Applied Sciences

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Electro-fluid-dynamic cooling devices (EFAs) are being recognized due to their enormous advantages for their application in several industrial sectors, their performance benefits from generated ionic winds and their singular features, which make them competitive with conventional fans and heatsinks. Due to the problems in the electronics industry, where traditional refrigeration systems are not effective due to their dimensions, this study analyzes an innovative arrangement based on wire-to-plane fins by direct current (DC) positive corona discharge in atmospheric air for applications. The paper focuses on optimizing the multicriteria geometry of the electrodes. Several parameters are analyzed such as the gap between emitter and ground electrodes, the electrode materials and geometry, the diameter of the high-voltage electrode and the influence of the dielectric barriers located near the corona electrode to improve heat exchange. Experimental validation shows the potential of this arrangement related to weight, volume, non-mobile parts and silence.

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“…Due to the strong influence of the geometrical parameters of EHD devices on the corona discharge process and the resulting EHD flow, and in order to save cost and time, significant modelling efforts have been performed over the last decade to study the impact of design parameters and optimisation of mesoscale EHD air pumps on the performance of flow generation or heat transfer characteristics [23,[31][32][33][34][35]. Very recently, Ramadhan et al [36] presented a numerical study to optimise the configuration of miniature wire-to-plane EHD blower for a range of heights (from 2 to 10 mm) based on different operating conditions (voltage and power). Simple relations for each optimization method were determined to predict the optimal length and location of the collector electrode of each blower.…”

Section: Introductionmentioning

confidence: 99%

Performance and flow characteristics of miniature EHD air blowers for thermal management applications

Ramadhan

Kapur

Summers

et al. 2018

Journal of Electrostatics

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Electrohydrodynamic (EHD) air blowers are receiving increasing attention as a thermal management cooling solution to overcome the restrictions of traditional rotary cooling systems used in small-scale consumer electronics. In this work, the performance and flow pattern characteristics of miniature EHD air blowers are evaluated for practical convective heat transfer applications, based on device size, operating voltage and power, and generated flow rate. For a range of blower heights up to 10 mm, two-dimensional (2D) and three-dimensional (3D) numerical models of a wire-to-plane EHD channel configuration are developed and validated against previous experimental data. Investigation of the influence of blower sidewalls, based on width parameter, on flow characteristics reveals that the 2D simulations for short and wide blower domains are valid to predict the generated flow rates effectively compared to that obtained by the means of 3D simulations. An optimized combined EHD blower is developed as a flow-controlled cooling system in thermal management applications, which minimizes the required operating voltages for specified flow rates. Comparisons against commercial rotary blowers demonstrate that the miniature EHD blowers are more competitive as cooling solutions for compact applications and extended heated surfaces based on transduction efficiency, blower size, flow production of uniform velocity profile, and power consumption.

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Numerical Analysis and Optimization of Miniature Electrohydrodynamic Air Blowers

Cited by 14 publications

References 39 publications

Numerical development of EHD cooling systems for laptop applications

Numerical development of EHD cooling systems for laptop applications

Design and Experimental Evaluation of Innovative Wire-to-Plane Fins’ Configuration for Atmosphere Corona-Discharge Cooling Devices

Performance and flow characteristics of miniature EHD air blowers for thermal management applications

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