Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Exploring diesel engine efficiency and pollutants in blending diesel fuel with waste tire oil pyrolysis with preheating process

Mahdi Qusai Adnan

Diagnostyka

2025

Vol. 26, No. 2

art. no. 2025215

Because so much tire waste is produced globally, there is a substantial waste disposal problem. Tires can be processed using pyrolysis to produce fuel, char, and gas as they do not disintegrate completely in the environment. This study focused on tire pyrolysis TP as an additional source of fuel as oxygenate blends, and conducted on a four-stroke diesel engine operating at 1500 rpm to test and compare pure diesel from Basra refinements DA 100% with other fuel categories. The di-fuel and tri-fuel mixture have been perpetrated by employing the magnetic stirrer devices, DA75%+TP25%, DB75% (high density diesel) from Dourah refinements75%+TP25%, and DA50%+DB25%+TP 25% this samples has been tested with and without preheating in diesel engine. Then all samples are placed in an Ultrasonic device to ensure a perfect mixture. It was found that the addition the TP decrease the engine power in all situation, and the maximum BTE% recorded for DA100%, and decreased for other samples by 7.7 and 11.9% when using DA75+TP25%, DB75%+TP25% respectively. The volumetric efficiency decreased by 7%, and all engine emissions recorded increased by 42.8%,10.71%,5.62%,78.125%, and 44.83% for CO, CO2, UNH, NOx, and smoke opacity for DB75%+TP25% compared with Basra pure diesel. Moreover, heated fuel to 60 oC, DA50%+DB25%+TP25% appears to behave like DA100% in both engine performance and emissions.

Numerical analysis and optimization of natural convection heat transfer in inclined square cavities with sinusoidal heating elements

Hamza Mohammed K., Mahdi Qusai Adnan, Idzikowski Adam, Mazur Magdalena

Production Engineering Archives

2024

Vol. 30, Iss. 4

491--500

This study presents a numerical analysis of natural convection heat transfer within inclined square cavities featuring sinusoidal heating elements. The analysis, conducted using a finite volume approach implemented in ANSYS 16.0, aims to estimate flow and heat regimes under steady-state conditions. Grid-independent analyses were performed to ensure numerical accuracy. The vertical walls of the enclosure were maintained at a cold temperature, while the other two walls were perfectly insulated. Key parameters investigated include Rayleigh numbers (104, 105, 106), corrugation numbers (3, 5, and 7), amplitude values (0.1, 0.3 and 0.5), and enclosure inclination angles (δ = 0°, 15°, 30°, 45°, 60°, 75°). The sinusoidal element's diameter to enclosure length ratio was set at 0.4, and fluid properties were assumed constant with a Prandtl number of 7.0. Results were illustrated using isothermal and flow lines, with heat transfer discussed in terms of local and average Nusselt numbers. Findings indi-cate that at Ra = 106, local Nusselt numbers exhibited a sinusoidal distribution influenced by corruga-tion and amplitude, with a 50% increase in local Nusselt number as amplitude increased from 0.1 to 0.5. Average Nusselt number enhancements were observed with higher corrugation numbers and wave amplitudes, while the number and size of eddies were sensitive to Rayleigh numbers. Enclosure incli-nation significantly affected the formation of vortices, particularly at angles of 60° and 75°.