The Effect of Particle Shape on Pressure Drop in Turbulent Pipe Flow of a Gas-Solid Suspension
01 Jun 1988-Journal of Fluids Engineering-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 110, Iss: 2, pp 222-225
TL;DR: Mesure de la chute de pression pour des suspensions de particules spheriques et fibreuses dans l'air as mentioned in this paper, a.k.a.
Abstract: Mesure de la chute de pression pour des suspensions de particules spheriques et fibreuses dans l'air
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TL;DR: In this paper, an experimental study was conducted on the development length of a two-phase flow produced by the loading of solid particles by means of a particle feeder into air flowing through a horizontal pipe.
Abstract: An experimental study was conducted on the development length of a two-phase flow produced by the loading of solid particles by means of a particle feeder into air flowing through a horizontal pipe. Development length was defined as the sufficient distance downstream of the particle feeder in which a homogeneous particle distribution in air sensed with the variation of local friction factors was attained. The static pressure gradients dP/dx were measured along the test pipe to determine the local friction factors to estimate the development length for a variety of air-solid particle suspensions. Crushed wheat and semolina particles of different size, shape and apparent density were used to determine the influence of physical particle characteristics on the extent of development region. The measurements were conducted in air flow Reynolds number range of 51500\leqRe\leq109000 at particle loading ratios of Mp/Ma, 5%\leq Mp/Ma\leq 30%. In the covered ranges of the variables, development length was found to be a strong function of Re such that an increase in Re caused a decrease in the development length while loading ratio seemed to be of secondary importance. Although the particle size by itself was found to be of not much importance for the size range covered in the experiments, for the critical values of Re (103000) and Mp/Ma(5%) particle size was found to be effective on the development length.
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Cites background from "The Effect of Particle Shape on Pre..."
...Therefore it can be said that for drag reduction to be observed in particulate flows, flow depelopment downstream of the particle loading should be maintained as it was done by Coughran (1988) who used a distance of approximately 120D for the attainment of fully-developed two-phase flow....
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...Coughran (1988) studied the influence of Mp/Ma and particle shape on the pressure drop in a horizontal flow of gas-solid suspensions in a Re range of 61000 Re≤114000 considering the particles with diameters d, in the range of 8 µm≤ d ≤ 20µm....
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01 Jan 1999
TL;DR: In this article, an experimental study was conducted on the development length of a two-phase flow produced by the loading of solid particles by means of a particle feeder into air flowing through a horizontal pipe.
Abstract: An experimental study was conducted on the development length of a two-phase flow produced by the loading of solid particles by means of a particle feeder into air flowing through a horizontal pipe. Development length was defined as the sufficient distance downstream of the particle feeder in which a homogeneous particle distribution in air sensed with the variation of local friction factors was attained. The static pressure gradients dP/dx were measured along the test pipe to determine the local friction factors to estimate the development length for a variety of air-solid particle suspensions. Crushed wheat and semolina particles of different size, shape and apparent density were used to determine the influence of physical particle characteristics on the extent of development region. The measurements were conducted in air flow Reynolds number range of 51500≤Re≤109000 at particle loading ratios of Mp/Ma ,5 %≤ Mp/Ma ≤ 30%. In the covered ranges of the variables, development length was found to be a strong function of Re such that an increase in Re caused a decrease in the development length while loading ratio seemed to be of secondary importance. Although the particle size by itself was found to be of not much importance for the size range covered in the experiments, for the critical values of Re (103000) and Mp/Ma(5%) particle size was found to be effective on the development length.