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A Comparison Study Between Navier-Stokes Equation and Reynolds Equation in Lubricating Flow Regime
Dong Joo Song,Duck Kyo Seo,William W. Schultz 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.4
For practical calculations, the Reynolds equation is frequently used to analyze the lubricating now. The full Navier-Stokes Equations are used to find validity limits of Reynolds equation in a lubricating now regime by result comparison. As the amplitude of wavy upper wall increased at a given average channel height, the difference between Navier-Stokes and lubrication theory decreased slightly; however, as the minimum distance in channel throat increased, the differences in the maximum pressure between N avier-Stokes and lubrication theory became large.
Jinyong Jun,Byeong-Jun Lee,DongJooSong 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
Combustion characteristics of a mixture of nano- and micron-sized aluminum powder in ice were experimentally studied. Round barshaped bare strand was casted with a frozen mixture of aluminum and water and then electrically ignited in the air or argon environment. Propagating flame was recorded using a camcorder with an optical filter. Burning rate, defined as the slope in the graph of average flame position movement versus time, was also evaluated. The burning velocity peaked at equivalence ratio (f) of 0.8. Flame propagation velocity increased with a pressure exponent of 0.61 for f = 0.8 and pressure range of 0.1–0.8 MPa. For nano/micro-mixture at f = 0.8, flame propagation was not feasible if the mass fraction of micron-sized particles in fuel is higher than 0.5.