This study introduced a method based on magnetic field assisted finishing mechanism for micromachining the inner surfaces of Aluminum tubes. In this approach, using the alternating magnetic field of an AC electromotor, abrasive particles were formed as Magnetic Rods (Magnetic Clusters) and surface micromachining was carried out by the dynamic particular pattern made by an alternating magnetic f...

In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the d...

Abstract In refrigeration systems, evaporative condensers have two main advantages compared to other condensation heat exchangers: They operate at lower temperature than traditional air-cooled and require a quantity of water pumping power towers. The mass transfer that occur on tube batteries are difficult study. aim this work is apply an experimental approach investigate the performance conden...

In this paper we discuss the reason why the parameters of the Sérsic model best-fitting the major axis light profile of elliptical galaxies can differ significantly from those derived for the minor axis profile. We show that this discrepancy is a natural consequence of the fact that the isophote eccentricity varies with the radius of the isophote and present a mathematical transformation that a...

Previous research of the authors pointed out that side-resonators can be applied to reduce fan noise. However, the noise reduction capabilities of most resonator geometries, e.g. tube resonators, cylindrical resonators (cylindrical air layers) and circular resonators (disc shaped air layers), are relatively narrow banded. This is disadvantageous in case resonators are used in combination with a...

In this paper, an iteration method using elliptical arc artificial boundary is designed to solve exterior Poisson problem with a concave angle. It is shown that the iteration method is equivalent to a Schwarz alternating method. The convergence of this method is given. The convergence rate is analyzed in details for a typical domain. Finally, some numerical examples are given, which show the ef...

Boreholes with 10% or more ellipticity are not uncommon. In this paper, we consider the coupling of an incident elastic wave into a borehole of irregular cross-section and investigate the cross-mode coupling phenomenon in sonic well logging in the presence of borehole irregularity. The mode-matching method is used. Different from its original formulation, we employ the Reichel et al. algorithm ...

Abstract Nanofluids contain nanometer-sized particles in suspension to enhance heat transfer by increasing the thermal conductivity. This paper provides an overview of particle size and volume fraction nanofluids, their roles enhancing transfer. Often, is enhanced dispersed with small diameter high concentration despite some debate about governing effects. The design elliptical cross-section zi...