This study focuses on development and validation of a CFD model to simulate the critical nozzle diameter stability limits for hydrogen non-premixed flames. The represents minimum size through which flame will remain stable at all driving pressures. Flames not blow-out diameters equal or greater than diameter. Accurate simulation this parameter is important assess performance thermally activated pressure relief devices (TPRD) during blowdown from storage tank. Flame considered overpressures...

Onboard hydrogen storage tanks are currently fitted with thermally activated pressure relief devices (TPRDs), enabling to blowdown in the event of fire. For release diameters below critical diameter, flame from TPRD may blow-out during a drop. Flame blow-outs pose safety concern for an indoor or covered environment, e.g., garage carpark, where can accumulate and deflagrate. This study describes application validated computational fluid dynamics (CFD) model simulate dynamic behaviour designed...

Black powders coming from the interactions of pipe and other metals with environment in gas transmission line can cause severe problems industry. In this work composition collected black powder up stream filtering system analyzed using XRF XRD techniques. Erosion test is carried on samples impeller alloy alcoholic slurry a laboratory set up. It shown that main constituent magnetite. The rotation speed presence humidity enhance erosion/corrosion consequence more production.

Temperature is considered as the basic element of climate and also environmental limiting factor in Lut Desert. In this research, order to identify temperature Desert located east central Iran, using remote sensing data, six series MODIS sensor images related June 24 th & December 23 rd 2002, January 22 nd , March September 2003 were employed. The rates have been estimated by band numbers 31 32 with locative separation power 1000 meters considering Sebal algorithm. According results...

Experiments are performed to investigate the single-phase flow heat transfer augmentation of MWCNT/HT-B oil in both smooth and microfinned helical tubes with constant wall temperature. The tests laminar regime were carried out three curvature ratios 2R/d=25, 30 35. Flow Reynolds number varied from 170 1800 resulting regime. effect some parameters such as nanoparticles concentration, dimensionless radius (2R/d) on was investigated for weight fraction base fluid less than 0.4%. within applied...

Spring back is one of main reason for inaccuracy sheet press formed product. Therefore; prediction spring very important production precise products. To calculate the amount many successful attempts have been done, but unfortunately; most them belong to simple cases such as single curved U or V, bending metals. In this study, an improved yield criterion proposed by Yoshida, incorporated in a new formulation double metal. This capable reveal influence transient Baushinger effect and work...