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Падение давления воздуха при пневмотранспортировании твердых частиц

Падение давления воздуха при пневмотранспортировании твердых частиц

Abstract

Paper refers to the calculation of the air pressure drop in pneumatic conveying of solid particles. Displayed value to calculate the differential pressure changes due to the presence of aerosol particles in the flow. The equations for calculating the change ratio of resistance of the pipe and the pressure drop of air at steady state pneumotransport solid particles obtained. The equations obtained from the ratio in which the sum of the forces acting on the particles and on the wall of the pipeline by air flow, equal to the product of the pressure drop in the pipeline in the area of its cross section. Also takes into account the dependence of the forces acting on particles in the air stream, from their relative velocities. For the case of pneumotransport spherical particles of equal diameter, including for Stokowski mode around the particles of air, derived explicit expressions for the drag coefficient of the pipeline. In the case of known distribution of particle velocities obtained equations for the calculation of the coefficient of resistance of the pipeline. It is shown that the dependence of the drag coefficient of the pipe and the pressure drop of air at pneumotransport solid particles is directly proportional to the flow of particles through the pipeline cross-section.

Получены уравнения для расчета изменения коэффициента сопротивления трубопровода и падения давления воздуха при установившемся режиме пневмотранспортирования твердых частиц. Уравнения получены из соотношения, в котором сумма сил, действующих на частицы и на стенку трубопровода со стороны потока воздуха, приравнена к произведению падения давления воздуха в трубопроводе на площадь его поперечного сечения. Учтена также зависимость силы, действующей на частицу в воздушном потоке, от относительной скорости частицы. Для случая пневмотранспортирования сферических частиц равного диаметра, в том числе и для стоксовского режима обтекания частиц воздухом, выведены явные соотношения для коэффициента сопротивления трубопровода. В случае известного распределения частиц по скоростям получены уравнения для расчета коэффициента сопротивления трубопровода. Показано, что зависимость изменения коэффициента сопротивления и падения давления воздуха при пневмотранспортировании твердых частиц прямо пропорциональна расходу частиц через сечение трубопровода.

Keywords

ПНЕВМОТРАНСПОРТИРОВАНИЕ, ПАДЕНИЕ ДАВЛЕНИЯ, КОЭФФИЦИЕНТ СОПРОТИВЛЕНИЯ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold