Investigation of Changes in Flow Parameters along the Transport Line in Installations for Pneumatic Transport of Cotton

Mahfuza Gapparova,Bahrom Mirzaev,Mutalov Muhammadodil,Olimjon Sarimsakov

doi:10.4236/eng.2022.141007

Mahfuza Gapparova, Bahrom Mirzaev + Show 2 more

Open Access

https://doi.org/10.4236/eng.2022.141007

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Abstract

The article presents the results of a study of changes in the parameters of the flow, velocity and pressure of air along the cotton transportation line in pneumatic transport installations and their dependence on the parameters of the pipeline. The purpose of the research is to theoretically substantiate the choice of the pipeline diameter depending on the properties of the material (cotton), the required processing capacity and pipeline throughput. In the research, an analytical method was used to study changes in the pressure of the air flow along the transportation line at different pipeline diameters. It is established that, according to the existing calculation method, the flow pressure along the transportation line is reduced to zero. At the same time, various scientists have proposed various analytical and empirical dependencies, which, in turn, give different ideas about the resistance of the inner surface of the pipes to the movement of air and material flow and do not describe the real situation, especially when transporting material from a long distance. This requires in-depth theoretical and applied research to establish real patterns of changes in flow parameters along the material (cotton) transportation line.

Highlights

For the transportation of cotton inside cotton processing plants, pneumatic transport units of the suction type are often used
The article presents the results of a study of changes in the parameters of the flow, velocity and pressure of air along the cotton transportation line in pneumatic transport installations and their dependence on the parameters of the pipeline
The purpose of the research is to theoretically substantiate the choice of the pipeline diameter depending on the properties of the material, the required processing capacity and pipeline throughput

Summary

Introduction

For the transportation of cotton inside cotton processing plants, pneumatic transport units of the suction type are often used. It is known that the dynamic pressure depends on density and air velocity, in the absence of vacuum (or exhaust) gas through the wall of the pipe (or pipe joints), i.e. the constancy of the speed of air, it does not change along the entire length of the pipeline and its possible to define the flow-rate measurement. Static pressure, assuming the density of known value that depends only on the height of the column of air, which is not determined instrumentally This pressure is estimated a direct measurement at the beginning (the mouth) and the end (of the fan) of the pipeline. By Blasius [1] [2] found that for hydraulically smooth tubes the increase in air velocity at constant diameter of the pipe reduces the resistance of the pipeline They have the inversely proportional dependence of drag coefficient on Reynolds number:. Μ - the coefficient of dynamic viscosity of air (1.85 × 10−5 Pa∙s)

Analysis of Research Results

Conclusions