Surface dielectric barrier discharge (SDBD) is used in a variety of different applications; however, the ozone generated can be toxic to people vicinity. In this paper, we study SDBD (using generators with smooth-edge, serrated and thin-wire high-voltage electrodes) terms generation. The electrical measurements time-resolved plasma imaging revealed differences current, dissipated power morphology for types showed significant suppression streamer formation from electrode. We determined amount...

Ice accumulation on wind turbine blades due to the impact of supercooled water droplets can be reduced by application surfaces with anti-icing properties. Hydrophobic are considered as a promising solution because their repellent behavior. In recent years, short-pulsed laser technologies have been developed an efficient technique modify surface properties materials. However, such not yet validated. this work, hybrid modification polyester resin-based gelcoats was adopted. Laser patterning...

We characterized non-thermal plasma generated in two types of Surface Dielectric Barrier Discharge (SDBD) reactors, one with a planar and the other cylindrical electrode. Plasma was examined using time-resolved imaging Optical Emission Spectroscopy (OES) methods. observed that electrode suppresses formation during both discharge modes: positive streamers pseudo-Trichel microdischarges. The propagation velocity front estimated to be range 12–15 m/s, regardless mode type. Spectral analysis...

One of the most commonly applied methods joining dissimilar materials is gluing. This could be mainly attributed to applicability this technique in various industries. The article presents a method material surface treatment, which increases shear strength adhesive joints for lightweight metals such as aluminum with plastics. For purpose, laser microstructuring was performed on each selected construction materials. As result active glued area increased, increased strength. picosecond UV...

In this paper, we report the use of a surface dielectric barrier discharge (DBD) for generation unidirectional flow inside glass tube, using external ring electrodes. The electrodes were made thin metal stripes mounted on wall tube and insulated with resin. One was grounded, other connected to an AC power supply. DBD generated between internal tube. As result, pumping air through occurred. presented geometry is attractive electrohydrodynamic (EHD) gas since there no direct contact pumped...

In this paper, an experimental investigation of the ablation plasma generated from copper substrate by means nanosecond laser pulses is presented. We studied evolution in first 1000 ns after onset using fast-gated imaging and optical emission spectroscopy methods. Plasma showed that expansion plume front can be described a so-called drag model, with limit increasing fluence 254 µm for 30J/cm2 to 375 67J/cm2. By Boltzmann plot Stark broadening methods, it was found within microsecond onset,...

The production of hydrogen from CH 4 :CO 2 :H S (70%:30%:1000ppm) mixture, simulating dry biogas in a DBD reactor, supplied with nanosecond negative pulses, is presented. We have found that sulphur produced H during the process changes electrical parameters reactor RVC electrode. As result, syngas and selectivity methane conversion into hydrogen, decreases. Due to changed reactors, radicals formed recombine C 3 hydrocarbons more efficiently, resulting lower hydrogen. Major by-product...

We investigated the dynamics of laser generated ablation plasma plume expanding in ambient air and sound wave by plasma. The was during nanosecond micromachining thin metal foil. time-resolved images were captured at several intervals. Using expansion rate determined. initial velocity found to vary from 6.0•10³ m/s ± 0.3•10³ 7.3•10³ depending on fluence. expending also varies with using acoustic microphone. Based obtained results we...

We present the results of experimental parametric study on efficiency, accuracy and quality femtosecond laser micromachining different materials. The process was performed with a solid-state Yb:KYW laser. generates 500 fs pulses three wavelengths, repetition rate from 100 to 900 kHz output power up 50 W. This allows perform complex research for wide range parameters Laser is based ablation phenomenon, i.e. total evaporation material target surface during irradiation. It most precise method...

The dynamics of UV nanosecond laser generated ablation plasma plume expanding in ambient air was investigated. time-resolved images the forming and were captured. Using captured initial velocity found to vary from 6103 m/s 7103 depending on pulse fluence. expansion parameters obtained by us compared with those predicted shockwave model drag model. It that better describes our experiment.

In this paper the results of an experimental studies on nanosecond laser micromachining selected materials are presented. Tested were thin plates made aluminium, silicon, stainless steel (AISI 304) and copper. Micromachining those was carried out using a solid state with second harmonic generation λ = 532 nm pulse width τ 45 ns. The effect drilling single burst pulses, as well cutting studied. influence fluence diameter morphology post ablation holes drilled investigated....

In this paper the design and performance of miniature electrohydrodynamic (EHD) pump driven by DC voltage is presented. The EHD had a pipe-like shape inner diameter 0.5 mm with two concentric pipe electrodes. was powered positive high (up to 12 kV). When applied net flow working liquid observed. Pumping tests were performed using isopropyl alcohol (CH <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> )...

In the paper results of 3D micromachining silicon using nanosecond (1064 nm), picosecond (343 nm) and femtosecond laser pulses are presented. Effective processing demands repeated scanning beam overlapping paths what generate many phenomena which do not occur by impact individual pulses. Thermal incubation effect shielding ejected particles compete decide on final result ablative micromachining. Applying femto does directly guarantee expected quality effectiveness.

Femtosecond–pulse laser micromachining is based on a ablation phenomenon, i.e. total evaporation of material from the target surface during irradiation. It most precise method removal. Moreover it does not require any post processing. Removal occurs only in focus, since lack thermal interaction, neither heat affected zone (HAZ) nor debris ocur. Research results have shown that shortening duration pulse significantly reduces HAZ, which translates into high quality machined structures. main...

PCB (Printed Circuit Board) industry is a global business for many years. can be found in every electronic devices and since it becomes smaller, lighter more efficient, new sophisticated machines need to developed meet this demands. The main parameter the manufacturing throughput. In paper multi-diode laser system UV exposure of photoresist on Printed Board presented. presents high throughput at resolution pattern as well low development costs.