Asian Transactions on Engineering

Volume: 05, Issue: 06, December 2015
ISSN 2221-4267

Title: Catalytic Photodegradation of Methyl orange using MgO nanoparticles prepared by molten salt method
Author(s): Shahbaa F. Bdewi, Ayad M. Abdulrazaka and Bakhtyar K. Aziz
Paper ID: ATE-15050657
Pages: 1 - 5
Abstract: MgO nanoparticles were prepared by molten salt method. The structure, particle size and surface morphology of MgO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The photocatalytic efficiency of the prepared MgO nanoparticles was evaluated by photocatalytic degradation of Methyl Orange in aqueous solution as a model pollutant under UV light irradiation. The particle sizes were ranging between 24 to 42 nm with an average particle size of 33.3 nm. The product exhibited good photocatalytic activity under UV irradiation. The influence of the operating parameters shows that 0.5 g.L-1 catalyst dose at an initial solution pH close to 7 are optimum conditions. The kinetics of the photodegradation of Methyl Orange was found to follow first order kinetics.

Full Text: PDF (798 KB)

Title: Mechanical And Thermal Stresses Analysis In Diesel Engine Poiston With And Without Different Thermal Coating Layer On Piston Head
Author(s): Nabeel Abdulhadi Ghyadh, Maher A.R. Sadiq Al-Baghdadi, Sahib Shihab Ahmed
Paper ID: ATE-15080691
Pages: 6 - 18
Abstract: The main goal of this paper are equate behavior of the piston with and without different thermal coating layer on the piston head below thermal and mechanical loads that arise in the piston due to its operating. Three dimensional model of an piston heavy diesel engine has been presented. The governing equations were have been discretized using a finite-volume method (FVM) and solved using multi-physics COMSOL® package version 5. The results of the numerical model are showing the temperature gradients distributions, temperature distribution, von-mies stresses distribution and displacement distribution in the diesel engine piston with and without 200 µm of thermal coating layer as (La2Zr2O7) which have low thermal conductivity. The results with thermal coating layer are best than results without thermal coating layer.

Full Text: PDF (1986 KB)

Title: Towards Automatically Cleaned Parabolic Trough Collectors
Author(s): Yousef A. Gharbia, Said Grami
Paper ID: ATE-15030655
Pages: 17 - 26
Abstract: Dust accumulation on parabolic trough collectors can lead to significant degradation to their performance, especially in the MENA region. Owing to the nature of the trough profile and the presence of the receiving tube inside the trough, automatic cleaning has not been a feasible option. This paper presents a thermal numerical analysis of the proposed new collector. This collector is similar to the conventional trough except that the top and end-sides of the trough are closed with sheets made of borosilicate material. The top sheet is curved out to improve its mechanical strength, to take advantage of the self-cleaning mechanism as a result of rain or moisture, and to facilitate the automatic cleaning process. This paper compares the performance of a conventional trough with the new ACPTC in terms of overall heat loss. The results have shown that the ACPTC has significantly outperformed the conventional trough.

Full Text: PDF (616 KB)