Numerical study of conjugate natural convection heat transfer of a blood filled horizontal concentric annulus

Alsabery, Ammar I.; Naganthran, Kohilavani; Azizul, Fatin M.; Hashim, Ishak

doi:10.1016/j.icheatmasstransfer.2020.104568

Cited by 23 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The findings demonstrate that in shallow cavities, an axial magnetic field effectively controls the flow and heat transmission, whereas, in tall cavities, a radial magnetic field accomplishes this. Recently, Alsabery et al [21] illustrated finite-element-based numerical simulations of the natural convection thermal mixing of a blood-filled horizontally aligned concentric annulus. According to this study, a low power-law index enhances the heat transfer rate and fluid flow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus

Singh,

Sengupta,

Rana

2024

Axioms

View full text Add to dashboard Cite

The present study presents a computational investigation into the thermal mixing along with entropy generation throughout the natural convection flow within an arbitrarily eccentric annulus. Salt water is filled inside the eccentric annulus, in which the outer and inner cylinders have Tc and Th constant temperatures. The Boussinesq approximation is used to develop the governing equations for the natural convection flow, which are then solved on a structured quadrilateral mesh using the OpenFOAM software package (FOAM-Extend 4.0). The computational simulations are performed for Rayleigh numbers (Ra=103–105), eccentricity (ϵ=0,0.4,0.8), angular positions (φ=0∘,45∘,90∘), and Prandtl number (Pr=10, salt water). The computational results are visualized in terms of streamlines, isotherms, and entropy generation caused by fluid friction and heat transfer. Additionally, a thorough examination of the variations in the average and local Nusselt numbers, circulation intensity with eccentricities, and angular positions is provided. The optimal state of heat transfer is shown to be influenced by the eccentricity, angular positions, uniform temperature sources, and Boussinesq state. Moreover, the rate of thermal mixing and the production of total entropy increase as Ra increases. It is found that, compared to a concentric annulus, an eccentric annulus has a higher rate of thermal mixing and entropy generation. The findings show which configurations and types of eccentric annulus are ideal and could be used in any thermal processing activity where a salt fluid (Pr=10) is involved.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus

Singh,

Sengupta,

Rana

2024

Axioms

View full text Add to dashboard Cite

show abstract

“…Imtiaz and Mahfouz [11] utilized the Fourier Spectral Method (FSM) to numerically analyze flow driven by buoyancy effect and combine conduction-convection flow and heat transfer in a concentric annular channel full of micropolar fluid. More recently, a numerical study on conjugate natural convection in a horizontally placed concentric annular channel using Carreau non-Newtonian blood as the annular fluid was conducted by Alsabery et al [12]. According to them, natural convection flow and heat transfer in the flow of blood using the Carreau model attracted fewer researchers in the past.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Natural Convection: A Study of Optimum Fluid Flow and Heat Transfer in Eccentric Annular Channels

Jamal

Mokheimer

2022

Journal of Engineering

View full text Add to dashboard Cite

Laminar natural convection-conduction heat transfer in vertically positioned annular channels with inherent eccentricity is investigated for optimum solid-fluid thermal conductivity ratio and optimum cylinder walls thicknesses allowing maximum induced fluid flow rate and heat transfer under varying geometry parameters, i.e., annulus eccentricity and radius ratio. A finite-difference technique is employed to solve the coupled momentum and energy equations for the cylindrical annulus walls and the annular fluid with Prandtl number 0.7. As part of the results, fluctuations in the induced fluid flow rate and heat transfer in the eccentric annular channel due to the conjugate effect, governed by the ratios of the solid and fluid thermal conductivities and thicknesses of outer and inner circular cylinder walls, are obtained for the boundary conditions of one wall heated isothermally and the other kept adiabatic. Commonly encountered ratios of the solid and fluid thermal conductivities and cylinder walls thicknesses are utilized in the present analysis. Results reveal that the optimum conductivity ratio and cylinder walls thicknesses increase nonlinearly with eccentricity and radius ratio. Such results can be very useful in effectively designing the heat transfer equipment for optimum performance.

show abstract

“…It has been established that for cooling systems, the most optimal cases are when one cylinder rotates, and the second cylinder is stationary, or both cylinders rotate in opposite directions. Alsabery et al 3 have studied the natural convective circulation of a non‐Newtonian material in a concentric ring under the cylindrical solid wall influence. The outer and inner walls are differentially heated.…”

Section: Introductionmentioning

confidence: 99%

Thermogravitational convection of power‐law nanofluid in a cavity with a heat‐generated section on the bottom wall

Loenko

Shenoy

Sheremet

2021

Math Methods in App Sciences

View full text Add to dashboard Cite

Optimization of cooling systems for electronic devices is one of the crucial challenges in the modern engineering world. Inclusion of nanosized particles to working heat transfer liquids can enhance the heat removal from the heated elements in electronics. Taking into account these data, the present research is devoted to numerical analysis of natural convection in a cavity filled with a non‐Newtonian nanosuspension under an influence of a heat‐generating wall section. The paper contains the simulation outcomes for two different cases, namely, a heat‐generating wall section with constant heat flux and a heat‐generating wall section with constant temperature. The considered phenomenon has been described using the single‐phase nanofluid model where the base liquid is a pseudoplastic fluid. The rheological parameters of the host liquid including the coefficient of flow density and an indicator of fluid behavior are the empirical data of MWCNT nanofluids. The non‐Newtonian nature of the nanoliquid has been described by the Ostwald‐de‐Waele power law. Detailed analysis has been carried out for different governing parameters including the Rayleigh number, the volume fraction of nanoparticles, and the size of the heater using the non‐primitive dimensionless variables and the finite difference method. Obtained results illustrate different temperature patterns for various boundary conditions. Moreover, in the case of heat‐generating element, the average Nusselt number is greater than for the isothermal heater. It should be noted that the considered nanofluid model reflects the energy transference degradation with a growth of the nanoparticles concentration.

show abstract

Numerical study of conjugate natural convection heat transfer of a blood filled horizontal concentric annulus

Cited by 23 publications

References 32 publications

Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus

Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus

Conjugate Natural Convection: A Study of Optimum Fluid Flow and Heat Transfer in Eccentric Annular Channels

Thermogravitational convection of power‐law nanofluid in a cavity with a heat‐generated section on the bottom wall

Contact Info

Product

Resources

About