Three dimensional simulation of natural convection and entropy generation in an air and MWCNT/water nanofluid filled cuboid as two immiscible fluids with emphasis on the nanofluid height ratio's effects

Salari, Mostafa; Malekshah, Emad Hasani; Esfe, Mohammad Hemmat

doi:10.1016/j.molliq.2016.12.004

Cited by 88 publications

(19 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, they used the level-set method to capture the free surface configuration. Recently, Salari, Malekshah and Esfe (2017) carried out a three-dimensional analysis of natural convection and entropy generation within a rectangular enclosure filled with two immiscible fluids (air and MWCNTs/water nanofluid) and examined the effect of Rayleigh number, solid volume fraction and height of nanofluid on heat transfer and volumetric entropy generation. They showed that increasing the height of nanofluid and Rayleigh number has a direct relationship with the average Nusselt number.…”

Section: Mmms 151mentioning

confidence: 99%

Hydrothermal investigation of a stratified system in enclosure with jagged surface for application in lead-acid batteries

Salari

Malekshah

Sarlak

et al. 2019

MMMS

Self Cite

View full text Add to dashboard Cite

Purpose The purpose of this paper is to investigate the three-dimensional natural convection and entropy generation in a cuboid enclosure filled with two immiscible fluids of nanofluid and air. Design/methodology/approach One surface of the enclosure is jagged and another one is smooth. The finite volume approach is applied for computation. There are two partially side heaters. Furthermore, the Navier–Stokes equations and entropy generation formulation are solved in the 3D form. Findings The effects of different governing parameters, such as the jagged surface (JR=0, 0.02, 0.04, 0.08, 0.12 and 0.16), Rayleigh number (103⩽Ra⩽106) and solid volume fraction of nanofluid (φ=1, 1.5, 2 vol%), on the fluid flow, temperature field, Nusselt number, volumetric entropy generation and Bejan number are presented, comprehensively. The results indicate that the average Nusselt number increases with the increase in the Rayleigh number and solid volume fraction of nanofluid. Moreover, the flow structure is significantly affected by the jagged surface. Originality/value The originality of this work is to analyze the natural-convection fluid flow and heat transfer under the influence of jagged surfaces of electrodes in high-current lead–acid batteries.

show abstract

Section: Mmms 151mentioning

confidence: 99%

Hydrothermal investigation of a stratified system in enclosure with jagged surface for application in lead-acid batteries

Salari

Malekshah

Sarlak

et al. 2019

MMMS

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the reduction in the nanoparticle diameter can enhance heat transfer by up to 15.9%. Salari et al 28 reported a numerical study of the natural convection and entropy generation for a layered fluid system in a curved enclosure that is differentially heated from the sides and filled with two immiscible gas/liquid fluids (air and MWCNT-water nanofluid). This study emphasized on the effects of the liquid interface aspect ratio, solid volume fraction of nanofluid, and Rayleigh number on the fluid flow, heat transfer, and entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

et al. 2020

View full text Add to dashboard Cite

In this study. The mixed convection in a square enclosure with a hot bottom wall and a conductive half-immersed rotating cylinder from its top wall is investigated numerically. The enclosure is filled with a copper-water nanofluid. The upper half of the cylinder is cooled by the surrounding air, whereas its solid lower half is exposed to the nanofluid. The two left and right sidewalls of the enclosure, together with

show abstract

“…Convective heat transfer increased significantly with the Richardson number, whereas entropy generation increased slightly. Salari et al [ 32 ] analyzed natural convection and entropy generation in a cavity containing two immiscible fluids: air and a water-based nanofluid. High values of volume fraction of nanofluid reduced total entropy generation and increased the Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Nanofluid Irreversibilities in a Heat Exchanger Used with an Aqueous Medium

Ovando-Chacon¹,

Ovando-Chacón

León³

et al. 2020

Entropy

View full text Add to dashboard Cite

Heat exchangers play an important role in different industrial processes; therefore, it is important to characterize these devices to improve their efficiency by guaranteeing the efficient use of energy. In this study, we carry out a numerical analysis of flow dynamics, heat transfer, and entropy generation inside a heat exchanger; an aqueous medium used for oil extraction flows through the exchanger. Hot water flows on the shell side; nanoparticles have been added to the water in order to improve heat transfer toward the cold aqueous medium flowing on the tube side. The aqueous medium must reach a certain temperature in order to obtain its oil extraction properties. The analysis is performed for different Richardson numbers (Ri = 0.1–10), nanofluid volume fractions (φ = 0.00–0.06), and heat exchanger heights (H = 0.6–1.0). Results are presented in terms of Nusselt number, total entropy generation, Bejan number, and performance evaluation criterion. Results showed that heat exchanger performance increases with the increase in Ri when Ri > 1 and when reducing H.

show abstract

Three dimensional simulation of natural convection and entropy generation in an air and MWCNT/water nanofluid filled cuboid as two immiscible fluids with emphasis on the nanofluid height ratio's effects

Cited by 88 publications

References 35 publications

Hydrothermal investigation of a stratified system in enclosure with jagged surface for application in lead-acid batteries

Hydrothermal investigation of a stratified system in enclosure with jagged surface for application in lead-acid batteries

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

Numerical Study of Nanofluid Irreversibilities in a Heat Exchanger Used with an Aqueous Medium

Contact Info

Product

Resources

About