HCharacterization of Pressure Drops and Heat Transfer of Non-Newtonian Power-Law Fluid Flow Flowing in Chaotic Geometry

Naas, Toufik Tayeb; Lasbet, Yahia; Boutarfaïa, Ahmed; Loubar, Khaled

doi:10.18280/ijht.340214

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…Call the speed of the interface between the most front of the gas and the liquid as front end velocity as shown in figure 3 "Gas liquid interface", which can represent evacuation velocity. The motion velocity at front end doesn't mean the flow rate of terminal liquid, so the velocity at front end cannot be judged by detecting the outlet liquid flow rate [8]. By means of organic glass tube and high speed camera, this paper captures the motion at front end so as to calculate the motion velocity at front end.…”

Section: Variation Of Flow Ratementioning

confidence: 99%

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Guo¹,

Zhang²,

Jiang³

et al. 2017

IJHT

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The test studies the gas-liquid two-phase flow characteristics in pump-assisted evacuation process for hillyterrain pipeline system. In pump-assisted evacuation process, there appear two flow patterns: stratified flow and slug flow. By means of reducing upstream back pressure, the pump-assisted evacuation can increase the liquid flow rate, promoting the transition of flow pattern. For the pipe-bottom pressure change process, it increases firstly, then decreases, and slowly increases at last. During the process of pressure drop, there will appear temporary buffer section for the slug accumulation. The pressure fluctuation doesn't increase with inlet superficial gas velocity, and the max fluctuation range appears in the working condition with 0.88m/s superficial gas velocity. The outlet liquid flow rate corresponds to the pressure fluctuation. Four stages are divided for the variation process. The flow rate is less influenced by the inlet superficial gas velocity, but more influenced by the inclined angle. By using gas front-end velocity meter to check the evacuation efficiency, it is found that with inclined angle of upward inclined pipe (UIP) unchangeable, the higher the gas superficial velocity, the greater the gas front-end velocity, presenting an approximate linear relationship; with the gas superficial velocity unchangeable, the gas front-end velocity almost remains the same, even with the inclined angle of upward inclined pipe increasing.

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Section: Variation Of Flow Ratementioning

confidence: 99%

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Guo¹,

Zhang²,

Jiang³

et al. 2017

IJHT

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“…The effects of thermal condition of non-Newtonian fluids rheology were investigated by Naas et al for C-shape chaotic geometry [20,21] and Multi-layer micromixers [22]. They selected a highly efficient heat mixing system and better thermodynamic performance, for rheology index ranging from 1 to 0.49.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hydrodynamic and Thermal Behaviour of Non-Newtonian-Nanofluid Mixing in a Chaotic Micromixer

Tayeb

Hossain²,

Khan

et al. 2022

Micromachines

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Three-dimensional numerical investigations of a novel passive micromixer were carried out to analyze the hydrodynamic and thermal behaviors of Nano-Non-Newtonian fluids. Mass and heat transfer characteristics of two heated fluids have been investigated to understand the quantitative and qualitative fluid faction distributions with temperature homogenization.The effect of fluid behaviorand different Al2O3nanoparticles concentrations on the pressure drop and thermal mixing performances were studied for differentReynolds number (from 0.1 to 25). The performance improvement simulation was conducted in intervals of various Nanoparticles concentrations (φ = 0 to 5%) withPower-law index (n) using CFD. The proposed micromixer displayed a mixing energy cost of 50–60 comparable to that achieved for a recent micromixer (2021y) in terms of fluid homogenization. The analysis exhibited that for high nanofluid concentrations, having a strong chaotic flow enhances significantly the hydrodynamic and thermal performances for all Reynolds numbers. The visualization of vortex core region of mass fraction and path lines presents that the proposed design exhibits a rapid thermal mixing rate that tends to 0.99%, and a mass fraction mixing rate of more than 0.93% with very low pressure losses, thus the proposed micromixer can be utilized to enhance homogenization in different Nano-Non-Newtonian mechanism with minimum energy.

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“…For non-Newtonian fluids, a numerical study was investigated for a steady laminar flow in two different geometries: complex, called C-shape, and straight channel by (Naas et al 2016).The generated chaotic flows canupgrade significantlyboth the flow and the thermal performances.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temporal Modulation on the Local Kinematic Process of Two-Dimensional Chaotic Flow: A Numerical Analysis

2021

JAFM

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In this work, a numerical analysis based on CFD method is carried out to examine an unsteady laminar flow of Newtonian fluids in a two-dimensional simulation of a mixer, which is composed of two rods inside a moving cylindrical tank. Three stirring protocols are considered: Non-modulated "NM", Continuously modulated "CM" and non-continuously modulated "ALT" by using the dynamic mesh technique and user defined functions "UDF's" for the velocity profiles. The chaotic advection is obtained by temporal modulation of the rotational velocity of the cylinder and the rods to enhance the mixing of the fluid for very low Reynolds number. For this purpose, we applied the Poincaré map as a reliable mathematic tool to check mixing quality by tracking particles inside the fluid domain. Additionally, we investigated the evolution of local flow proprieties such as rotation rate, deformation rate and elongation rate at different time periods in order to see the effect of temporal modulation on the fluid kinematics. Among the considered protocols, the results of the mentioned simulation showed that it is possible to obtain a chaotic advection only for noncontinuously modulated protocol which enhance mixing fluid efficiency.

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HCharacterization of Pressure Drops and Heat Transfer of Non-Newtonian Power-Law Fluid Flow Flowing in Chaotic Geometry

Cited by 15 publications

References 19 publications

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Evaluation of Hydrodynamic and Thermal Behaviour of Non-Newtonian-Nanofluid Mixing in a Chaotic Micromixer

Effect of Temporal Modulation on the Local Kinematic Process of Two-Dimensional Chaotic Flow: A Numerical Analysis

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