Numerical Study on the Mixed Convection Heat Transfer between a Sphere Particle and High Pressure Water in Pseudocritical Zone

Wei, Liping; Lu, Youjun; Wei, Jinjia

doi:10.1155/2013/527182

Cited by 20 publications

(8 citation statements)

References 27 publications

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“…The authors noticed that due to a rise in the convection parameter, the momentum boundary layer thickness was raised. Some other studies in the literature on the mixed convection, forced convection and free convection are given by Labib et al (2013), Wei et al (2013), Gorla et al (2017), Rostami et al (2018) and Jamaludin et al (2019).…”

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confidence: 99%

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Yashkun

Zaimi

Ishak

et al. 2020

HFF

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Purpose This study aims to investigate the flow and heat transfer of a hybrid nanofluid through an exponentially stretching/shrinking sheet along with mixed convection and Joule heating. The nanoparticles alumina (Al2O3) and copper (Cu) are suspended into a base fluid (water) to form a new kind of hybrid nanofluid (Al2O3-Cu/water). Also, the effects of constant mixed convection parameter and Joule heating are considered. Design/methodology/approach The governing partial differential equations are transformed into ordinary differential equations (ODEs) using appropriate similarity transformations. The transformed nonlinear ODEs are solves using the bvp4c solver available in MATLAB software. A comparison of the present results shows a good agreement with the published results. Findings Dual solutions for hybrid nanofluid flow obtained for a specific range of the stretching/shrinking parameter values. The values of the skin friction coefficient increases but the local Nusselt number decreases for the first solution with the increasing of the magnetic parameter. Enhancing copper volume fraction and Eckert number reduces the surface temperature, which intimates the decrement of heat transfer rate for the first and second solutions for the stretching/shrinking sheet. In detail, the first solution results show that when the Eckert number increases as 0.1, 0.4 and 0.7 at λ = 1.5, the temperature variations reduced to 10.686840, 10.671419 and 10.655996. While in the second solution, keeping the same parameters temperature variation reduced to 9.750777, 9.557349 and 9.364489, respectively. On the other hand, the results indicate that the skin friction coefficient increases with copper volume fraction. This study shows that the thermal boundary layer thickness rises due to the rise in the solid volume fraction. It is also observed that the magnetic parameter, copper volume fraction and Eckert number widen the range of the stretching/shrinking parameter for which the solution exists. Practical implications In practice, the investigation on the flow and heat transfer of a hybrid nanofluid past an exponentially stretching/shrinking sheet with mixed convection and Joule heating is crucial and useful. The problems related to hybrid nanofluid have numerous real-life and industrial applications, such as microelectronics, manufacturing, naval structures, nuclear system cooling, biomedical and drug reduction. Originality/value In specific, this study focuses on increasing thermal conductivity using a hybrid nanofluid mathematical model. The novelty of this study is the use of natural mixed convection and Joule heating in a hybrid nanofluid. This paper can obtain dual solutions. The authors declare that this study is new, and there is no previous published work similar to the present study.

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confidence: 99%

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Yashkun

Zaimi

Ishak

et al. 2020

HFF

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“…The flow is stable and symmetric within the range of Re less than 210 . Previous studies have shown that the flow of SCW around particles at Re ≤ 200 is a stable symmetrical flow. − The Re range of this work is 25–200. The physical properties of SCW vary with temperature, which causes the drag force of interactive particles to change.…”

Section: Methodsmentioning

confidence: 77%

“…Thus, when considering physical properties, Re and distance must be considered simultaneously. In the research of SCW, the effect of physical properties can be expressed as a function of physical properties. − The effect of physical properties is obtained by analysis as eq . Therefore, the drag ratio correlation in SCW is expressed as eq .…”

Section: Resultsmentioning

confidence: 99%

“…Regardless of gravity and radiation heat transfer, the governing equation can be written as follows: where ρ is the density, u is the velocity, μ is the dynamic viscosity, p is the pressure, H is the enthalpy, K is the kinetic energy, λ is the thermal conductivity, T is the temperature. Previous work has shown that algorithms and discrete formats do not require special processing for SCW. − The numerical method used in this work is direct numerical simulation (DNS). Therefore, the algorithm for solving the N-S equation uses SIMPLE, where the discrete format of convection terms uses second-order upwind.…”

Section: Methodsmentioning

confidence: 99%

“…Although Jin et al studied the drag coefficient ratio in SCW, the variation in physical properties caused by temperature changes was not considered in the research. Previous research studies on particle behavior in SCW were mainly carried out on isolated particles. − However, the behavior of interactive particles is significant for SCWFB, especially the drag force of the trailing particle. The experimental research on SCW has significant limitations.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of the Drag Force of Interactive Particles in Supercritical Water

Wang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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The drag of interactive particles in supercritical water (SCW) is studied by simulation. The difference in drag force between the leading particle and isolated particle is relatively small. The drag ratio between the trailing particle and leading particle is mainly analyzed. It is found that the variation trends of drag ratio in SCW are similar to that in fluids with constant properties. In particular, physical properties of SCW also have a special effect on drag ratio of the trailing particle. However, the degree of effect of physical properties is affected by the Re and distance. A new expression of the drag ratio is established for fluids with constant properties and developed into a new correlation for SCW.Article pubs.acs.org/IECR

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Two‐Dimensional Solidification Simulation of PCM Molten Salt as a Thermal Energy Storage for Stirling Engine

Putra,

Putra

2024

Energy Storage

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Thermal energy storage technologies have been widely used to mitigate intermittency from renewable energy sources such as solar energy. Phase change material (PCM) is a material that can be used as a heat storage medium and is available in a wide range of operating temperatures. Molten salt is one of the PCMs that has the advantage of a very high operating temperature. The PCM solidification simulation based on HitecXL molten salt using COMSOL Multiphysics software was carried out with variations in heat absorption of 1–5 kW/m2, assuming constant heat absorption. The results showed that the PCM solidification process started from the surface of the Stirling engine heat exchanger pipe. The part of the PCM that is solidified falls due to gravity, causing a phenomenon similar to a droplet. The flow that occurred was natural, driven by the buoyancy force resulting from density changes due to temperature gradients in the solidification process. The time required for the PCM to completely solidify was closely related to the amount of heat absorption; the greater the heat absorption from the pipe, the faster the PCM is fully solidified.

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Numerical Study on the Mixed Convection Heat Transfer between a Sphere Particle and High Pressure Water in Pseudocritical Zone

Cited by 20 publications

References 27 publications

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Hybrid nanofluid flow through an exponentially stretching/shrinking sheet with mixed convection and Joule heating

Numerical Investigation of the Drag Force of Interactive Particles in Supercritical Water

Two‐Dimensional Solidification Simulation of PCM Molten Salt as a Thermal Energy Storage for Stirling Engine

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