Principles of pneumatic conveying

Klinzing, G. E.; Marcus, R. D.; Rizk, F.; Leung, L. S.

doi:10.1007/978-94-015-8981-9_6

Cited by 4 publications

(4 citation statements)

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“…According to Barth’s additional pressure drop theory, 20 , 21 the pressure drop in the inner hole of the drill pipe during cuttings removal can be divided into the friction pressure drop of airflow called air-phase pressure drop and the additional friction pressure drop of cuttings called cuttings-phase pressure drop. The air-phase pressure drop is the pressure drop of the pure airflow field under the same air velocity.…”

Section: Experimental Study Of Reverse Circulation Pneumatic Cuttings...mentioning

confidence: 99%

Pressure drop characteristics of reverse circulation pneumatic cuttings removal during coal seam drilling

Han

Song

2020

Science Progress

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To solve the problems that the borehole depth is shallow and the drilling efficiency is low during the gas drainage drilling in soft coal seam with current cuttings removal method, a new technology of reverse circulation pneumatic cuttings removal is proposed. The working principle of reverse circulation pneumatic cuttings removal is analyzed, and the kinetic equation of cuttings in the inner hole of the drill pipe is established. Through experiments, the pressure drop in the drill pipe is measured to reveal the effects of air velocity, cuttings mass flow rate, and cuttings particle size on the pressure drop in inner hole of the drill pipe. When the cuttings mass flow rate is constant, the pressure drop increases with the increase in air velocity. When the air velocity is constant, the pressure drop increases with the increase in cuttings mass flow rate. At low air velocity, the pressure drop of cuttings is primary. As the air velocity increases, the pressure drop ratio of cuttings decreases. Under the same conditions, the order of pressure drop with different particle size cuttings is coarse cuttings > medium cuttings > fine cuttings. Empirical equation of pressure drop coefficient of cuttings is established, which is in good agreement with the actual data.

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Section: Experimental Study Of Reverse Circulation Pneumatic Cuttings...mentioning

confidence: 99%

Pressure drop characteristics of reverse circulation pneumatic cuttings removal during coal seam drilling

Han

Song

2020

Science Progress

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“…Pressure drop required for conveying through the pipeline can be calculated by considering these interactions. Researchers have presented numerous correlations for pressure drop and friction factors in a dilute mode of flow through horizontal pipelines [7–12].…”

Section: Introductionmentioning

confidence: 99%

Review and analysis of solids friction factor correlations in fluidized dense phase conveying

Shijo

Behera

2020

Tribology - Materials, Surfaces & Interfaces

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Few researchers have presented solids friction factor correlations for the fluidized dense phase conveying of fine particles or powders. Pressure drop for conveying can be predicted using these correlations. These correlations predict the pressure drop with minimum error margin for a definite pipeline configuration or for some specific types of conveying materials. Few researchers have applied their correlations for different pipeline configurations (of different pipeline lengths or diameters) or different conveying materials to predict the pressure drop. In this paper, different solids friction factor correlations for the fluidized dense phase conveying have been considered which are available in the literature and the behaviour of these correlations have been studied under length scale-up or diameter scale-up conditions. It has been observed that only few correlations exhibit natural pressure drop variation with change in pipeline length or pipeline diameter.

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“…Avaliando a transição de regimes de fases densa e diluída para o transporte vertical, muitos pesquisadores vêm propondo ao longo do tempo diagramas que representam tal transição, citando Zenz e Othmer (1960), Yerushalmi et al (1976), Leung (1980), Matsen (1982), Grace (1986), Rizk (1986). Na maioria dos estudos, os diagramas são feitos baseandose na velocidade do gás, vazões de partículas e na queda de pressão pela altura do leito considerado.…”

Section: Condição Choking E Transição De Regimes Em Transporte Verticalunclassified

“…Alguns pesquisadores deduziram empiricamente como prever o local exato da mudança de regime por meio de equações, como foi o caso de Rizk (1986), outros, como aqueles citados no início desse item, elaboraram diagramas que variaram dos mais simples até formatos bem elaborados. A questão é que existe muita discussão acerca das divergências encontradas na forma de definir e identificar limites e fica claro que no regime denso a compreensão do fenômeno é um desafio maior visto que existem muitas variações no modo do escoamento no intervalo que contempla do escoamento pulsátil até o início do regime diluído.…”

Section: Condição Choking E Transição De Regimes Em Transporte Verticalunclassified

Estudo exploratório do acoplamento dos softwares Rocky / Fluent

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Principles of pneumatic conveying

Cited by 4 publications

References 0 publications

Pressure drop characteristics of reverse circulation pneumatic cuttings removal during coal seam drilling

Pressure drop characteristics of reverse circulation pneumatic cuttings removal during coal seam drilling

Review and analysis of solids friction factor correlations in fluidized dense phase conveying

Estudo exploratório do acoplamento dos softwares Rocky / Fluent

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