Laser drilling yilbas bekir sami. Bekir Sami Yilbas 2019-02-14

Laser drilling yilbas bekir sami Rating: 7,9/10 827 reviews

Bekir Sami Yilbas

laser drilling yilbas bekir sami

Design and implementation of transparent super hydrophobic surfaces that repel atmospheric dust from solar panels, and thus reduce reflectivity of the surfaces are thus highly desirable. Dust removal from such surfaces involves with energy intensive processes and requires excessive clean water usage, which remains difficult in the areas where clean water scarcity is high. Recent changes in climate results in storms and extended distribution of green gasses around the globe. The dusts are collected from the local environment and characterized using the analytical tools. In the analysis, the governing transport equation is transformed into two-dimensional linear mixed Fredholm—Volterra type integral equation, and the solution is obtained through Liouville—Neumann series. The predictions are compared with the experimental results.

Next

Bekir Sami Yilbas: Laser Heating Applications (ePUB)

laser drilling yilbas bekir sami

It encompasses the basics of laser processing and provides an introduction to analytical modeling of the process. It is shown that the optimum size and the configuration of the power plant differ for each scenarios considered. The life cycle assessment reveals that material selection for laser cutting is critical for the environmental protection point of view. The kerf width size is formulated and predicted using the lump parameter analysis and it is measured from the experiments. Optical properties of functionalized silica particle deposited glass surfaces are examined prior to and after oil impregnation.

Next

Bekir Sami Yilbas: Laser Heating Applications (ePUB)

laser drilling yilbas bekir sami

It is found that heat transfer from the hydrophobic surface to the droplet gives rise to the formation of two counter rotating cells inside the droplet. The characteristics of environmental dust and the effects of mud formed from the dust particles as a result of water condensing in humid air conditions on an aluminum wafer surface are examined. The material selection for construction of thermal energy storage and energy harvesting devices is critical for sustainable and efficient operation with minimum maintenance and replacement costs. Energy transfer parameter is defined to assess the energy gain by the working fluid against the amount of solar energy absorbed by the blocks. Consequently, removal of dust particles becomes essential prior to formation of chemically active fluid. The use of metallic meshes in the working fluid increases heat transfer and reduces the time needed to reach the desired temperature in the working fluid. Variation of the Nusselt and the Bond numbers with the droplet contact angle is analyzed for two heating situations case 1 and case 2.

Next

Study of Affecting Parameters in Laser Hole Drilling of Sheet Metals

laser drilling yilbas bekir sami

The effects of the dust particles on the textured surface in a humid air ambient are to be investigated. The adhesion of the mud dried solution on the treated and untreated surfaces is assessed through determining the tangential force required for the removal of the solution from the surface. Analytical tools are used to assess the morphological changes on the laser textured surface prior and after the dust settlement in the humid air ambient. Selective surfaces, such as zirconium nitride, tungsten oxide, etc. Self-cleaning surfaces exhibit special anti-wetting properties owing to the water contact angle greater than 150° leading to the ready rolling-off of water droplets. Varying the plates temperature changes the Nusselt number; in which case, droplet heating from the bottom plate results in higher values of the Nusselt number than that of the top plate heating.

Next

Laser Drilling

laser drilling yilbas bekir sami

The geometric features of the droplet incorporated in the simulations resemble the actual droplet geometry of the experiments. Currently, he is a subject editor of Arabian Journal of Engineering and Sciences and the regional editor of Lasers in Engineering Journal. Therefore, study into the ejection of liquid due to vapour bubble formation is necessary. Air is used as the working fluid inside the receiver. Metallurgical and morphological changes in the laser treated layer are examined using the analytical tools.

Next

Laser Drilling

laser drilling yilbas bekir sami

Dust accumulation and subsequent mud formation on solid surfaces in humid environments typically have adverse effects on surface properties such as optical transmittance, surface texture, and microhardness. Analytical tools are used to characterize the laser treated surfaces. Structured aluminum meshes are incorporated into the tube while stagnant water is assumed as the working fluid inside the tube. The present results show that an increase in combustion temperature improves the work rate by turbines and thermoelectric generators appreciably. The net amount of work output by organic Rankine cycle 1 in embodiment 2 is improved from 8023 kW to 8908 kW.

Next

Bekir Sami Yilbas

laser drilling yilbas bekir sami

This study is extended to include the influence of spatial distribution of the laser pulse on temperature rise and phase change processes. Dust particles compose of various elements including alkaline and alkaline earth metals. The electrochemical response and corrosion rates of treated surfaces in controlled environment is brought attention for various selective materials including alumina, titanium and copper alloys, aluminum—silicon composite, high-strength low alloy steel, and Hastelloy alloy. In general, cut sections are free from large asperities; however, local dross attachments at the kerf edge and crack network formation at the kerf surface are observed. Silicone oil impregnation considerably improves the optical transmittance of functionalized silica particle deposited glass. The contribution of the ballistic phonons to the energy transfer across the minute size vacuum gap is larger than that of the near field radiation; however, increasing the gap size slightly lowers the ballistic phonon contribution.

Next

Laser Drilling

laser drilling yilbas bekir sami

It is found that the fracture toughness of the coating surface produced by the tungsten carbide blended powders is less than that of the coating produced by corrosion resistance powders. The model study for laser treatment of the coating is presented and the development in temperature and stress fields is demonstrated. The innovative integration of cooling system and energy recovery Pelton turbine greatly improves energetic and exergetic efficiencies of photovoltaic panels and multigeneration system. With so many variables, and with incomplete knowledge of the relationships between them, statistical methods are needed to design experiments and to analyse the results. The hydrophibicity of the laser treated surface is assessed using the sessile drop method.

Next

Bekir Sami Yilbas

laser drilling yilbas bekir sami

The predictions of numerical code are validated through the previous experimental data. Tailoring the physical and chemical characteristics of the surfaces enable to extend the surface engineering studies in many new fields including medical, biological, environmental engineering, and architecture. Temporal variation of equivalent equilibrium temperature does not follow exactly temperature rise at the aluminum dot edge because of scattering of phonons in the film. Increasing the cold junction temperature difference increases the device maximum efficiency by 3. Micro-post arrays are created on a silicon wafer surface via lithography technique.

Next