CFD Modeling of Slurry Pipeline at Different Prandtl Numbers

Parkash, Om; Kumar, Arvind; Sikarwar, Basant Singh

doi:10.18186/thermal.930932

Cited by 9 publications

(2 citation statements)

References 75 publications

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“…Figure 5 shows the trend of Prandtl numbers for water vapor and liquid water at distinct temperature levels [31,32].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5. Prandtl number curves of water medium[27,31].Tilt angle is a dominant and key parameter affecting the condensation performance of water harvesting systems.Compared to the laminar film condensation, tilt angle has more impact on the condensation rate of wavyturbulent systems especially at greater Prandtl numbers. The dimensionless condensation rates of horizontal and tilted systems are presented in Fig.6for 𝑅𝑒 𝐻 > 30 regime.…”

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confidence: 99%

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Analytical Investigation on the Condensation Performance of Vertical, Tilted and Horizontal Surfaces for Passive Water Harvesting

Güngör

2023

Mugla Journal of Science and Technology

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Condensate harvesting is the phenomenon of obtaining water from water vapor in the humid air condensing on a surface. Water vapor undergoes phase change and becomes liquid once air is cooled to dew point temperature. The idea is a passive technique with no additional energy consumption, yet condensation performance of a surface varies with many parameters. This study analytically investigates the condensation performance of vertical, tilted, and horizontal water harvesting systems under laminar, wavy and turbulent flow regimes. First, viscous effects, inertia, and gravitational forces are examined in detail to express the evolution of boundary layer in a condensation film. Then the condensation performance of each surface orientation and tilt angles are documented and compared for all flow conditions. Although the vertical surfaces have higher condensate harvesting performance compared to the tilted and horizontal systems, the condensation rate is only about 2% lower up to 15⁰ tilt angle. When the harvesting surface is tilted at 30⁰, the condensation rate of the laminar film decreases by 3.5%, while the reduction is about 4.7% in wavy-turbulent film condensation. The results indicate that the change in condensation rate is more evident just after 45⁰ tilt. Condensation performance of laminar condensate film at 45⁰, 60⁰ and 75⁰ tilt angles decreases by 8.3%, 15.9% and 28.7%, while the condensation performance losses of wavy-turbulent flows are about 10.9%, 20.7% and 36.3% at identical tilt angles. Furthermore, 89⁰ tilted surfaces experience 63.7% and 74.1% lower condensate harvesting in laminar and wavy-turbulent regimes, respectively. In addition, identical horizontal surfaces produce only one fifth condensation rate of a vertical system.

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“…Figure 5 shows the trend of Prandtl numbers for water vapor and liquid water at distinct temperature levels [31,32].…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Analytical Investigation on the Condensation Performance of Vertical, Tilted and Horizontal Surfaces for Passive Water Harvesting

Güngör

2023

Mugla Journal of Science and Technology

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Numerical Investigation of Slurry Pressure Drop at Different Pipe Roughness in a Straight Pipe Using CFD

2022

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Slurry flow (water–glass beads) through a horizontal pipe of diameter, 0.0549 m and length, 3.8 m with two particle sizes, i.e., 125- and 440-micron, has been numerically modeled and investigated based on the kinetic theory of slurry transportation. The effect of particles interaction on the pipe flow characteristics such as velocity profile, wall shear stress, vector regime, granular pressure and temperature has been evaluated at different solid concentration and flow velocity range. It is well established that the pressure drop is the key parameter for the design of efficient slurry pipeline system, which is influenced by factors such as flow velocity, slurry viscosity, solid concentration, pipe material and pipe geometry. However, to best of our knowledge, the estimation of pressure drop at different pipe roughness height and a concentration range of 40–60% is not yet established. Therefore, in the present work, the numerical simulation is carried out for slurry flow through a horizontal pipeline at different roughness heights (Rh = 10–50 micron) and Prandtl numbers, i.e., 1.34, 2.14, 3.42 and 5.83. The kinetic parameters are calculated at a flow velocity (Vm) of 1–5 ms−1 and solid concentration (Cw) range of 40–60%. The results and procedure of the current simulation are validated against the available experimental results in the literature. The outcomes of the present work reveals that pressure drop increases with increase in pipe roughness height for the chosen velocity and solid concentration range. In addition, the larger particle is found to have more influence on the pressure, velocity, temperature distribution for the entire range of flow velocity and solid concentration. Furthermore, settling velocity and specific energy consumption are also predicted and discussed through the slurry pipeline. The findings show that the settling velocity of particle increases with increase in particle size at different Prandtl number. The energy efficiency for solid transportation through pipeline at different Prandtl numbers and particle size are also evaluated. Based on the results, it is concluded that specific energy efficiency varies with solid concentration and particle size, i.e., higher concentration and larger particle size demonstrates higher energy consumption. Furthermore, fluid at low Prandtl number exhibits higher energy consumptions. In order to design the efficient slurry pipeline system, it is recommended that the slurry must be transported at low velocity and high Prandtl number.

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CFD modeling for slurry flow through a horizontal pipe bend at different Prandtl number

Joshi

Parkash

Krishan

2022

International Journal of Hydrogen Energy

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CFD Modeling of Slurry Pipeline at Different Prandtl Numbers

Cited by 9 publications

References 75 publications

Analytical Investigation on the Condensation Performance of Vertical, Tilted and Horizontal Surfaces for Passive Water Harvesting

Analytical Investigation on the Condensation Performance of Vertical, Tilted and Horizontal Surfaces for Passive Water Harvesting

Numerical Investigation of Slurry Pressure Drop at Different Pipe Roughness in a Straight Pipe Using CFD

CFD modeling for slurry flow through a horizontal pipe bend at different Prandtl number

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