One of the important characteristics in predicting the flow of two phases (gas and liquid) in the industrial equipment is the gas percentage in the liquid, which is called voidage. This characteristic can be measured by different methods; the optical method is one of them. In the present work, a He-Ne laser light is employed to measure the voidage. The measurement depends on the principle of laser light attenuation during its passage through a mixture of fluids, which is governed by Beer-Lambert law. The attenuated light is measured using silicon type detector and an oscilloscope with a plotter. The gas phase was air while the liquid phase was contaminated water situated in a vertical column. The experiments were done with different air flow rates in water (1, 2, 3, 4,5and 6 liters per minute) with two spot sizes of laser (5mm dia & 10 mm dia). The results illustrated the possibility of measuring the voidage using laser beam and are compared with another one based on the liquid level variation (level ratio) in the column. Furthermore, the results provide that the 10mm dia spot size of laser beam gives better results.
The alcohol–gasoline blend fuels nowadays are increasingly used instead of gasoline in automobiles. In the present study, the temperature distribution within the cylinder of Suzuki 250Gsx motor was studied, taking in account the use of gasoline, E10-gasoline and E20-gasoline blends as a fuel, separately. The temperature fields are calculated using ANSYS 11 software. The geometric model and dimensions of the cylinder was established using Solid work 2003 program then imported by ANSYS11. After applying the boundary conditions and taking the assumptions in account, the results illustrated that the interchange of gasoline by E10-gasoline and or E20-gasoline blends has a variety of thermal load on the cylinder. Where the temperature distributed decreasingly towards the axial and radial directions. In addition, the engine becomes colder as the ethanol percentage in the fuel been 20%. This may provide supporting information for new designs for using E10-gasoline and or E20-gasoline blends on SI engines so that not to effect the engine operation and lubricating oil performance
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