Showing papers by "Alexander Mamishev published in 2013"
TL;DR: In this paper, the authors compared and contrasted electrostatic fluid accelerators (EFAs) design and performance metrics to those of other air-side cooling technologies used in small form factor applications.
90 citations
TL;DR: In this article, an interfacial stress sensor is presented which is capable of simultaneously measuring normal compressive stress and horizontal shear stress and is expected to create an artificial skin to understand such load distribution.
Abstract: To help improve the comfort of an amputee, it is important to develop artificial skin to understand the load distribution between the residual limb and the prosthetic socket for a prosthetic socket system. This paper presents an interfacial stress sensor which is capable of simultaneously measuring normal compressive stress and horizontal shear stress and is expected to create an artificial skin to understand such load distribution. A mathematical model based on regression analysis is built and an experiment is conducted to obtain the transfer function of the sensor. A significance test shows that the transfer function has a statistical significance at a significance level of 0.05 and the regression model fits the experimental data with a sample determination coefficient . The relative error is also analyzed in the end. The results show that the sensor is capable of measuring a range 0-320 kPa normal compressive stress with a relative error of 5% and a range of 0-70 kPa horizontal shear stress with a relative error of 14%.
10 citations
28 May 2013
TL;DR: In this paper, the authors present guidelines for the optimization of a wire-rod electrostatic fluid accelerators (EFAs) in terms of the number of electrodes and the applied voltage at the corona electrodes.
Abstract: Due to the current trend of increasing component densities and decreasing form factors for microelectronics, greater heat intensities are generated across smaller surface areas, exceeding the current cooling capabilities of conventional cooling technologies. Air cooling technologies still play an important role in overall thermal management strategy. Among air cooling technologies, electrohydrodynamics (EHD)-based air movers, also known as electrostatic fluid accelerators (EFAs) or ionic wind pumps, have been considered one of the most advanced air cooling devices due to their superior features, such as the elimination of moving parts and high energy efficiency. EFAs use Coulomb forces between charged molecules as the driving force to push bulk air to generate airflow. In contrast to conventional rotary fans, EFAs significantly reduce acoustic noise and increase energy efficiency due to the elimination of moving components. Therefore, further development of EFAs will enable their widespread adoption and effective use of EFAs. This investigation presents guidelines for the optimization of a wire-rod EFA device, in terms of the number of electrodes and the applied voltage at the corona electrodes. These guidelines are carried out by using the statistical method, analysis of variance (ANOVA), to analyze the numerical data. The results indicate that the air velocity at the channel outlet is not proportional to the number of electrodes. Obtaining a maximum air velocity requires a thoughtful multistep optimization procedure, in which several geometrical and material property parameters are considered.
7 citations