05. Petrashev A.I., Knyazeva L.G. Increasing the Flow Capacity of Hoses with Electrical-Heater Coils to Supply Thickened Preservatives for Spraying

DOI: 10.15507/2658-4123.031.202104.559-576

Increasing the Flow Capacity of Hoses with Electrical-Heater Coils to Supply Thickened Preservatives for Spraying

Aleksandr I. Petrashev
Head of the Laboratory for Storage and Protection of Equipment from Corrosion, All-Russian Research Institute for Use of Machinery and Petroleum Products in Agriculture (28 Novo-Rubezhnyy Pereulok, Tambov 392022, Russian Federation), Dr.Sci (Engr.), ORCID: https://orcid.org/0000-0002-7949-6883, Researcher ID: ABD-2066-2021, Scopus ID: 57211665518, This email address is being protected from spambots. You need JavaScript enabled to view it.

Larisa G. Knyazeva
Chief Scientist of the Laboratory of Storage and Protection of Equipment from Corrosion, All-Russian Research Institute for Use of Machinery and Petroleum Products in Agriculture (28 Novo-Rubezhnyy Pereulok, Tambov 392022, Russian Federation), Dr.Sci (Chem.), Associate Professor, ORCID: https://orcid.org/0000-0002-3232-2210, Researcher ID: S-4930-2017, Scopus ID: 7003449084, This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract
Introduction. Anticorrosion protection of agricultural machinery working elements is provided through using pneumatic application of thickened preservatives with heating. For this purpose, a wire coil is inserted inside the preservative-supply hose and connected to a current source. It is known that the wire thickness and the coil pitch affect the hydraulic resistance to fluid flow. However, it has not been established how the diameter of the coil insert and its heating affect the flow capacity of the flexible hose channel. The purpose of the research is to increase the capacity of a flexible hose with an electrical-heater coil. For this purpose, it is necessary to determine its geometric parameters minimizing the hydraulic resistance to the thickened preservative flow and reducing the energy consumption for heating the material in the hose.
Materials and Methods. It is proposed to investigate two electrical-heater coils of the same length, but of different diameter, made of steel welding wire pieces of equal length. There was developed a stand to study the influence of the inserted coil parameters on the hose hydraulic resistance. The stand was used to determine pressure losses in hoses with coils and in smooth hoses when used engine oil and thickened preservative flow through them. The flow capacity of the hose with cold and heated coils was estimated.
Results. The method of heating the preservative in the hose wall layer is justified. At the same time, its flow capacity increases one and a half times with less energy consumption (2.4 times) than when heating the preservative in the central part of the hose. Under laminar flow mode, the pressure loss in the hose is 2 times lower when the coil is equal to 0.85 of the hose channel diameter than when the coil is equal to 0.67 of the channel diameter.
Discussion and Conclusion. The research found the rational way of placing the electrical coil near the heated hose channel wall. At low air temperature, the reduction of the thickened preservative viscosity by heating in the hose helps to decrease the pressure loss up to 50% and increase its flow capacity by 1.4‒2.0 times. The use of a electrical-heater coil in the hose with thickened preservative will minimize energy consumption when preserving equipment on open storage sites.

Keywords: heated hose, throughput, flow rate, hydraulic resistance, coil insert, thickened preservative, viscosity

Acknowledgments: The authors express their deep gratitude to the reviewers, whose critical assessment of the presented materials and suggestions for improving contributed to a significant improvement in the quality of this article.

The authors declare no conflict of interest.

For citation: Petrashev A.I., Knyazeva L.G. Increasing the Flow Capacity of Hoses with Electrical-Heater Coils to Supply Thickened Preservatives for Spraying. Inzhenernyye tekhnologii i sistemy = Engineering Technologies and Systems. 2021; 31(4):559-576. doi: https://doi.org/10.15507/2658-4123.031.202104.559-576

Contribution of the authors:
A. I. Petrashev – conducting theoretical and experimental research, formulating goals and conclusions.
L. G. Knyazeva – literature review, processing and analyzing the results.

All authors have read and approved the final manuscript.

Submitted 19.07.2021; approved after reviewing 10.11.2021;
accepted for publication 15.11.2021

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