Abstract
The hydrodynamic effects on spectroscopic water detection were microscopically investigated in a gasoline pipe flow. The effects of the gasoline flow rate and the water content on the water droplet characteristics were investigated experimentally using a phase Doppler particle measurement system. The characteristics of spectral absorbance of water and gasoline were measured using a spectrophotometer to determine the optimal wavelength of the incident light for spectroscopic water detection. The effects of the droplet size on the light transmittance characteristics were calculated using the light extinction theory of Mie scattering on polydisperse particles and experimental results on the water droplet size in the gasoline flow. The measurement results of spectral absorbance showed that gasoline was almost transparent at 980 nm wavelength of light while water showed peak absorption at this wavelength, therefore, it was appropriate incident light for spectroscopic water detection. It was found that the flow conditions of the gasoline flow rate and the water content influenced the Sauter mean diameter and the volume concentration of water droplets, which influenced the light transmittance.
Highlights
The water content in a liquid petroleum fuel is an influential factor in determining the fuel quality because the fuel composition is contaminated by water
The purpose of this paper is to investigate the hydrodynamic effects on spectroscopic water detection in a gasoline pipe flow
The results showed that the light transmittance decreased linearly with increased water content and the decreasing rate of the light transmittance was gradually enlarged with increased gasoline flow rate
Summary
The water content in a liquid petroleum fuel is an influential factor in determining the fuel quality because the fuel composition is contaminated by water. The instantaneous water detection in a gasoline pipelines is very useful to control the quality and purity of the fuel. Many studies on the water content in liquid fuel have been reported over the years and most of these researches have investigated the performance and emissions of combustion engine systems [1,2,3,4,5]. Few studies on the microscopic characteristics of water droplets in a liquid fuel have been reported [6,7,8]. Bampi et al [8] used near-infrared spectroscopy to predict the droplet size and water content in a soybean and animal fat biodiesel emulsion. NIR spectroscopy was confirmed to be a good option to estimate the average droplet size and water content in water-biodiesel emulsions
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