Double vortex generators for increasing the separation efficiency of the air separator

Jawarneh, Ali M.; Al‐Widyan, Mohamad I.; Al-Migdady, Ahmad; Tlilan, Hitham M.; Tarawneh, Mohammad; Ababneh, Amer Khalil

doi:10.18280/ijht.350309

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…It is a known fact that high turbulence with swirling flow enhances particles and fluid mixing [4]. Detailed study on swirling flow can be found in [5,6,7,8]. Many attempts have also been made to model the minimum velocity of slurry flow at which solid particles in the flow will remain suspended in the flowing fluid stream (Critical Velocity) and below which the particles start depositing to form sliding bed (Critical deposition velocity).…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

2023

jjmie

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In this study, a model for the prediction of coal particle gradation in horizontal fluid pipeline was developed. The intent of this study is to develop a model that can predict the coal particle gradations in horizontal coal-liquid slurry pipelines. A semiempirical model originally developed by Karabelas has been modified by applying the k-ε approach to model a dimensionless diffusivity, originally assumed to be constant. The mechanistic model developed shows that dimensionless diffusivity is a function of root mean square turbulent velocity fluctuations and many other parameters which include fluid velocity, pipe diameter, carrier fluid and suspended particles densities, particle size, and the efflux concentration. The modified model was compared with four different sets of experimental data and a CFD model, and was found to have overall good agreement. It was employed to analyze particle gradations and the results show that larger coal particles tend to drift to the pipe bed, leaving the upper section of the pipes for smaller particles. The results show that concentration profile of coal particles in single-sized homogenous slurry is different from that of the same particle concentration in multi-sized slurry flow for each particle size and the same efflux concentration. The modified model was applied to analyze the d50 concentration profile and the result shows that d50 concentration profile represents the actual profile accurately within low and moderate range of particle sizes in the slurry. The mechanistic model presented in this study will be useful for coal and other mining industries worldwide, for accurate prediction of concentration profiles and choice of particle sizes as well as flow velocity of slurry in horizontal pipelines to avoid deposition and clogging of particles along the pipeline, thereby reducing associated danger in the pipelines.

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Section: Introductionmentioning

confidence: 99%

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

2023

jjmie

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“…Moreover, no guiding rules could be established for predicting the occurrence of counteracting wind and stack effects, since no consistent trends were observed. k-ε turbulent model, Reynolds stress turbulent model and Large eddy simulation turbulent models are also frequently used to incorporate the turbulence effect in flow inside or over a domain [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Impact of Internal Wall Barriers on Airflow Pattern in Natural Cross-Ventilation of the Common Houses in Bhubaneswar City, India

2023

jjmie

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Common walls between houses are a major reason for improper ventilation in apartment buildings. They make a compulsion for improper positioning of doors/windows. The shape of the house also affects the airflow distribution patterns inside the house. In this work, the effect of various shapes of the house on the ventilation inside the rooms is investigated with a cross-flow ventilation configuration, where the total floor area of the house is maintained as 1000 square feet. Moreover, work also has been performed to investigate the airflow inside a square-shaped house with different door/window configurations for various inlet airflow directions. Besides that, the impact of inlet airflow velocity on the ventilation process has also been investigated. From the investigation, it has been observed that with an increase in air volume flow rate, the area covered with low-velocity air (< 1 m/s) decreases and the area covered with high-velocity air ( > 2 m/s) increases irrespective of the shape of the house but does not follow any pattern for the comfort condition airflow velocity. The airflow pattern is not changed significantly with increase in inlet airflow velocity, but the airflow velocity regions are changed significantly. For a square shape house, 78% area is covered with a low air velocity region (< 1 m/s) is the highest with N & E door/window configuration. 62% area covered with high air velocity region (> 2 m/s) is the highest with N & S door/window configuration. 26% area covered with comfort flow condition (between 1-2 m/s) is the highest with N & S door/window configuration.

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“…Swirl flow demonstrates nearly 22% enhancement of Nu and nearly 19% reduction of the T s compared to the axial flow. In addition, utilizing jet vortex technology was found to be very useful in enhancing the separation efficiency of air separators 7 …”

Section: Introductionmentioning

confidence: 99%

“…In addition, utilizing jet vortex technology was found to be very useful in enhancing the separation efficiency of air separators. 7 Rennie et al 8 carried out an experimental study on a helical heat exchanger. Experimental data agreed with numerical data for larger heat exchangers in terms of Nusselt number, but there were some differences between numerical data and experimental data for smaller heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on heat transfer augmentation in a double pipe heat exchanger utilizing jet vortex flow

2022

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This paper examines experimentally the effect of jet vortex technology on enhancing the heat transfer rate within a double pipe heat exchanger by supplying the heat exchanger with water at different vortex strengths. A vortex generator with special inclined holes with different inlet angles was designed, manufactured, and integrated within the heat exchanger. In this study, four levels of Reynolds number for hot water in the annulus (Reh) were used, namely, 10,000; 14,500; 18,030; and 19,600. Similarly, four levels of Reynolds number for cold water in the inner tube (Rec) were used, namely, 12,000; 17,500; 22,500; and 29,000. As for the inlet flow angle (θ), four different levels were selected, namely, 0°, 30°, 45°, and 60°. The temperature along the heat exchanger was measured utilizing 34 thermocouples installed along the heat exchanger. It was found that increasing the inlet flow angle (θ) and/or the Reynolds number results in an increase in the local Nusselt number, the overall heat transfer coefficient, and the ratio of friction factor. It is revealed that the percentage increase in the average Nusselt number due to swirl flow compared to axial flow was 10%, 40%, and 82% for an inlet flow angle of 30°, 45°, and 60°, respectively.

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Double vortex generators for increasing the separation efficiency of the air separator

Cited by 3 publications

References 28 publications

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

Impact of Internal Wall Barriers on Airflow Pattern in Natural Cross-Ventilation of the Common Houses in Bhubaneswar City, India

Experimental study on heat transfer augmentation in a double pipe heat exchanger utilizing jet vortex flow

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