Behaviour of a Non-Newtonian Fluid in a Helical Tube Under the Influence of Thermal Buoyancy

Ramla, Mohamed; Laidoudi, Houssem; Bouzit, Mohamed

doi:10.2478/ama-2022-0014

Cited by 3 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equations ( 1)-( 9) can be used to solve differential equations that model the fluid behaviour. These equations can be written as follows [45][46][47]:…”

Section: Mathematical Formulationmentioning

confidence: 99%

Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles

2023

Archives of Thermodynamics

View full text Add to dashboard Cite

This work is an attempt to study the behaviour of fluid in the mixing vessel with a two-bladed or four-bladed impeller. The working fluid is complex, of a shear-thinning type and the Oswald model is used to describe the fluid viscosity. The study was accomplishedby numerically solving the governing equations of momentum and continuity. These equations were solved for the following range of conditions: 50-1000 for the Reynolds number, 0-0.15 for the baffle length ratio, and the number of impeller blades 2 and 4. The simulations were done for the steady state and laminar regime. The results show that the increase in baffle length (by increasing the ratio baffle length ratio) decreases the fluid velocity in the vessel. Increasing the speed of rotation of the impeller and/or increasing the number of blades improves the mixing process. Also, the length of the baffles does not affect the consumed power.

show abstract

“…Equations ( 1)-( 9) can be used to solve differential equations that model the fluid behaviour. These equations can be written as follows [45][46][47]:…”

Section: Mathematical Formulationmentioning

confidence: 99%

Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles

2023

Archives of Thermodynamics

View full text Add to dashboard Cite

show abstract

“…The shape and the position of the body also play a role in the dynamic behaviour of the flow [7][8][9][10]. On the other hand, a group of researchers focused on changing the shape of the outer wall of the channel in order to develop the dynamic behavior of the fluid [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

3D simulation of incompressible flow a rounda rotating turbulator: Effect of rotational and direction speed

2023

Archives of Thermodynamics

View full text Add to dashboard Cite

This paper presents new results for the dynamic behaviour of fluid around a rotating turbulator in a channel. The turbulator has a propeller form which is placed inside a flat channel. The research was carried out using 3D numerical simulation. The rationale of the experiment was as follows: we put a propeller-turbulator inside a flat channel, and then we insert a water flow inside the channel. The turbulator rotates at a constant and uniform speed. The main points studied here are the effect of the presence of turbulator and its rotational direction on the flow behaviour behind the turbulator. The results showed that the behaviour of flow behind the turbulator is mainly related to the direction of turbulator rotating. Also, the studied parameters affect coefficients of drag force and power number. For example, when the turbulator rotates in the positive direction, the drag coefficient decreases in terms of rotational speed of the turbulator, while the drag coefficient increases in terms of rotational speed when the turbulator rotates in the negative direction.

show abstract

“…On other hand, some researchers studied the fluid quality and its effect on the thermal evolution of the system. Some of them used non-Newtonian fluids (Guendouci et al 2021;Laidoudi et al 2022b;Yigit et al 2017;Laidoudi et al 2020b;Matin et al 2013;Ramla et al 2022), while others exploited nanofluids in order to augment the thermal comportment (Garoosi et al 2014;Sheikholeslami et al 2015;Maneengam et al 2022;Laidoudi et al 2022c). In the end, it was understood that the type of fluid and its behavior relatively affect the thermal activity, and that this effect varies from one thermal system to another.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Nanofluid Natural Convection Flow in a Cpu Heat Sink Using Buongiorno Tow-Phase Model

Anouar¹,

Mokhefi²

2022

JSSCM

View full text Add to dashboard Cite

In this paper, a numerical investigation using the finite element method on the cooling capacity of an electronic heat sink has been presented. This heat sink is intended for cooling applications of micro-computer CPUs. It deals with a parallelepipedal block with rectangular fins, filled with a nanofluid and crossed by four cylindrical pipes in which a cooling gas flows and dissipates the heat generated by the processor. Indeed, the cooling occurs by three transfers: the first one evacuates the heat from the processor towards the gas, the second one transfers this heat towards the nanofluid and the last one is cooled from the ambient air by means of the fins laterally arranged on the block. From this work, it has been planned to contribute to the study of the behavior of a nanofluid in the heat sink in the presence of a uniform magnetic field in order to enhance the operating and cooling performances. The effects of some control parameters have been highlighted on the hydrodynamic, thermal, and mass behavior of the nanofluid, namely: the Rayleigh number (103 â‰¤ Ra â‰¤ 105), the Hartmann number (0 â‰¤ Ha â‰¤ 100), the angle of inclination of the magnetic field (0 â‰¤ Î³ â‰¤ 90Â°) and the nanoparticles diameter (1 nm â‰¤ dp â‰¤ 10 nm). On the other hand, a new fin design has been proposed in this study allowing the enhancement of the heat exchange rate with ambient medium. The studied phenomenon is governed by the equations of the two-phase nanofluid model proposed by Buongiorno and which describe the following balances: mass, momentum, energy and nanoparticles. The system of partial differential equations with initial-boundary conditions has been solved by the finite element method. After performing a mesh independence check and validating with previous papers, the results of the investigation were presented. They showed that the application of a magnetic field significantly reduces the rate of heat exchange. However, increasing the angle of inclination of this field promotes convective heat transfer. Moreover, the use of zigzag fins improves the cooling rate by about 4% for amplitude of 0.05 compared to the standard configuration.

show abstract

Behaviour of a Non-Newtonian Fluid in a Helical Tube Under the Influence of Thermal Buoyancy

Cited by 3 publications

References 40 publications

Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles

Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles

3D simulation of incompressible flow a rounda rotating turbulator: Effect of rotational and direction speed

Numerical Investigation of the Nanofluid Natural Convection Flow in a Cpu Heat Sink Using Buongiorno Tow-Phase Model

Contact Info

Product

Resources

About