Optimization of heat transfer enhancement and pumping power of a heat exchanger tube using nanofluid with gradient and multi-layered porous foams

Siavashi, Majid; Bahrami, Hamid Reza Talesh; Aminian, Ehsan

doi:10.1016/j.applthermaleng.2018.04.066

Cited by 123 publications

(29 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Siavashi and Jamali [197] analyzed entropy generation due to turbulent flow of TiO 2 /water dispersions in an annulus by using two-phase mixture model. In another study on the application of two-phase mixture models, Siavashi et al, in three different works [198][199][200], investigated nanofluid flow inside a porous tube and annulus [198]. Toosi and Siavashi [201] employed the two-phase mixture model for numerical simulation of Cu-water nanofluid flow inside a partially porous cavity.…”

Section: Mixture Modelmentioning

confidence: 99%

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

Self Cite

View full text Add to dashboard Cite

It has been more than two decades since the discovery of nanofluids-mixtures of common liquids and solid nanoparticles less than 100 nm in size. As a type of colloidal suspension, nanofluids are typically employed as heat transfer fluids due to their favorable thermal and fluid properties. There have been numerous numerical studies of nanofluids in recent years (more than 1000 in both 2016 and 2017, based on Scopus statistics). Due to the small size and large numbers of nanoparticles that interact with the surrounding fluid in nanofluid flows, it has been a major challenge to capture both the macro-scale and the nano-scale effects of these systems without incurring extraordinarily high computational costs.To help understand the state of the art in modeling nanofluids and to discuss the challenges that remain in this field, the present article reviews the latest developments in modeling of nanofluid flows and heat transfer with an emphasis on 3D simulations. In part I, a brief overview of nanofluids (fabrication, applications, and their achievable thermo-physical properties) will be presented first.Next, various forces that exist in particulate flows such as drag, lift (Magnus and Saffman), Brownian, thermophoretic, van der Waals, and electrostatic double layer forces and their significance in nanofluid flows are discussed. Afterwards, the main models used to calculate the thermophysical properties of nanofluids are reviewed. This will be followed with the description of the main physical models presented for nanofluid flows and heat transfer, from single-phase to Eulerian and Lagrangian two-phase models. In part II, various computational fluid dynamics (CFD) techniques will be presented. Next, the latest studies on 3D simulation of nanofluid flow in various regimes and configurations are reviewed. The present review is expected to be helpful for researchers working on numerical simulation of nanofluids and also for scholars who work on experimental aspects of nanofluids to understand the underlying physical phenomena occurring during their experiments.

show abstract

Section: Mixture Modelmentioning

confidence: 99%

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…is apply us in industrial domain including cooling of electronic circuit [1], thermal performance of energy efficiency [2], flow and heat transfer in solar collectors [3], lubrication technologies [4], geothermal heat exchangers [5][6][7][8] and many others. In the literature, numerous analytical models, numerical and experimental researches have done on the mixed convection heat transfer in different geometries [9,10].…”

Section: Introductionmentioning

confidence: 99%

Combined Heat and Mass Transfer of Fluid Flowing through Horizontal Channel by Turbulent Forced Convection

Salhi

Amghar

Bouali³

et al. 2020

Modelling and Simulation in Engineering

View full text Add to dashboard Cite

In the present paper, we report a numerical study of dynamic and thermal behavior of the incompressible turbulent air flow by forced convection in a two-dimensional horizontal channel. This one contains the complicated form of the deflector which has been studied by varying the inclination angle from φ = 40°, φ = 55° to φ = 65°. The baffles are mounted on lower and upper walls of the channel. The walls are maintained at a constant temperature (375 K), the inlet velocity of air is Uint = 7.8 m/s, and the Reynolds number Re = 8.73 × 104. A specifically developed numerical model was based on the finite-volume method to solve the coupled governing equations and the SIMPLE (Semi Implicit Method for Pressure Linked Equation) algorithm for the treatment of velocity-pressure coupling. For Pr = 0.71, the results obtained show that (i) the streamlines and isotherms are strongly affected by the inclinations angles at Re = 8.73 × 104, (ii) the friction coefficient near the baffles increases under the angle exchange effect, and (iii) for a constant Re, the local Nusselt number at the walls of the channel varies with increasing the inclination angle of the deflector. Furthermore, the deflectors are generally used to change the direction of the structure of flow and also to increase the turbulence levels. We can conclude that the contribution of inclined baffles improves the increase of heat and mass transfer in which the Nusselt number at a certain angle increases noticeably.

show abstract

“…Also, the effects of porous layer thicknesses were studied. Compound heat transfer enhancement of a tubular heat exchanger using porous foams and nanoparticles was studied in the recent work of Siavashi et al They numerically examined the effects of multi‐layered and gradient porous media on both heat transfer and pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Baou

Afsharpanah

Delavar

2019

Heat Trans. Asian Res.

View full text Add to dashboard Cite

A vehicle radiator is used for cooling down the hot working fluid with airflow passing over its flow passages and fins.The proper design of the radiator is very important due to space and weight limitations in automobiles. In this study, a numerical investigation has been conducted on the improvements, which can be obtained by implementing different porous fins in the radiator channels.The effects of different porous fin configurations with the same porous media volume on the heat transfer rate and pressure drop were investigated. The coefficient of performance values were presented for evaluating the overall performance. The investigated geometries included horizontal, vertical, corrugated, and wavy-corrugated configurations. The results showed that the corrugated pattern had the best thermal performance among these geometries while the horizontal configuration presented the lowest pressure loss, even though the best overall performance belonged to wavy-corrugated configuration. After selecting this configuration, the influence of different porous materials on the radiator performance was studied. Finally, the radiator with the optimum porous media configuration and material was compared to a conventional radiator. It was found that implementing this porous media in the radiator channels improves its overall thermal performance factor up to 237%. K E Y W O R D Sheat exchanger, heat transfer enhancement, porous media, pressure drop, thermal performance, vehicle radiator

show abstract

Optimization of heat transfer enhancement and pumping power of a heat exchanger tube using nanofluid with gradient and multi-layered porous foams

Cited by 123 publications

References 54 publications

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

Combined Heat and Mass Transfer of Fluid Flowing through Horizontal Channel by Turbulent Forced Convection

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Contact Info

Product

Resources

About