Transient turbulent simulation of natural convection flows induced by a room heater

Elgendi, Mahmoud

doi:10.1016/j.ijthermalsci.2017.12.012

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…By applying these dimensionless variables, the governing equations ( 1)-( 4) can be reduced to non-dimensional form as follows: , 2018Dogonchi et al, 2018b) HFF 28,12…”

Section: Problem Descriptionmentioning

confidence: 99%

“…In the case of clear fluid, it is possible to note the following papers related to the considered topic (Oztop et al, 2015;Saravanan and Sivaraj, 2017;Miroshnichenko and Sheremet, 2018b;Das et al, 2018;Bondareva and Sheremet, 2017;El-Gendi, 2018;Gibanov and Sheremet, 2017;Ben-Nakhi and Chamkha, 2007;Chamkha, 2002;Ben-Nakhi and Chamkha, 2006;Chamkha HFF 28,12 and Al-Mudhaf, 2005;Sun et al, 2011;Chamkha et al, 2002;Umavathi et al, 2005). Thus, Oztop et al (2015) have analyzed natural convection heat transfer and fluid flow within different types of enclosures with local heaters, considering the working fluid as a simple fluid or a nanofluid.…”

Section: Introductionmentioning

confidence: 99%

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MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Dogonchi

Sheremet

Pop

et al. 2018

HFF

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Purpose The purpose of this study is to investigate free convection of copper-water nanofluid in an upper half of circular horizontal cylinder with a local triangular heater under the effects of uniform magnetic field and cold cylinder shell using control volume finite element method (CVFEM). Design/methodology/approach Governing equations formulated in dimensionless stream function, vorticity and temperature variables using the single-phase nanofluid model with Brinkman correlation for the effective dynamic viscosity and Hamilton and Crosser model for the effective thermal conductivity have been solved numerically by CVFEM. Findings The impacts of control parameters such as the Rayleigh number, Hartmann number, nanoparticles volume fraction, local triangular heater size, shape factor on streamlines and isotherms as well as local and average Nusselt numbers have been examined. The outcomes indicate that the average Nusselt number is an increasing function of the Rayleigh number, shape factor and nanoparticles volume fraction, while it is a decreasing function of the Hartmann number. Originality/value A complete study of the free convection of copper-water nanofluid in an upper half of circular horizontal cylinder with a local triangular heater under the effects of uniform magnetic field and cold cylinder shell using CVFEM is addressed.

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“…By applying these dimensionless variables, the governing equations ( 1)-( 4) can be reduced to non-dimensional form as follows: , 2018Dogonchi et al, 2018b) HFF 28,12…”

Section: Problem Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Dogonchi

Sheremet

Pop

et al. 2018

HFF

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“…CFD is a vital technique to simulate the flow around blowers [23], gas turbines [24], and wind turbines [25]. In addition, CFD can simulate natural convection flow precisely [26]. This approach has essentially grown in the field of aerodynamic research, and it is particularly useful for analyzing wind turbines.…”

Section: Validate Bem Methods Against Cfdmentioning

confidence: 99%

Review on validation techniques of blade element momentum method implemented in wind turbines

Abdelkhalig

Elgendi

Selim

2022

IOP Conf. Ser.: Earth Environ. Sci.

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There are two broad kinds of energy sources: renewable and non-renewable. In the renewable energy sector, significant advancements have been made in wind energy, the world’s fastest-growing renewable energy production technology. Despite this rapid development, the wind industry must still strive to ensure that any device designed for commercial use is reliable and its performance satisfies its economic projections. The critical factor in achieving this target is rotor aerodynamics because the rotor is the part that mainly reacts with the wind. When designing a wind turbine, the assessment of the aerodynamic characteristics of the blades must be accurate. Errors may result in wrong estimates of the turbines’ performance and economic projections. If experimental measurements cannot determine these characteristics, a designer will use alternative methods. Several modeling methods have proven viable solutions for design and analysis purposes, like Blade Element Momentum (BEM) methods. BEM methods analyze the aerodynamic performance of wind turbines, but it requires validation to examine the accuracy of its results. This paper highlights and reviews BEM validation techniques implemented in wind turbine aerodynamics analyses. BEM is validated against experimental data and other advanced models, namely, higher-order vortex and CFD (Computational Fluid Dynamics) models. Nevertheless, the experimental data are essential in wind turbine studies for both understanding the aerodynamic mechanisms and validating all these models.

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“…Several investigations and experiments were conducted for various structural configurations, such as rectangular and square cavities [21][22][23][24][25], and non-structure enclosures such as sinusoidal and inclined protuberances [14,16,19,26]. The effects of Rayleigh [17,24] and Reynolds numbers on the behavior of free, forced, and mixed convection were studied in [24][25][26][27][28][29]. Furthermore, various studies were conducted on the conditions of mass transfer and heat fluid motion for square cavities and rectangular shapes in a closed system [7,[30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Moist Air Flow Analysis in an Open Enclosure. Part A: Parametric Study

Chati

Rahmani

Naas

et al. 2021

Eng. Technol. Appl. Sci. Res.

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Heat and mass transfer in many systems are widely accomplished applying natural convection process due to their low cost, reliability, and easy support. Typical applications include different mechanisms in various fields such as (solar energy, solar distiller, stream cooling, etc…). Numerical results of turbulent natural convection and mass transfer in an open enclosure for different aspect ratios (AR = 0.5, 1, and 2) with a humid-air are carried out. Mass fraction and local Nusselt number were proposed to investigate the heat and mass transfer. A heat flux boundary conditions were subjected to the lateral walls and the bottom one make as an adiabatic wall, while the top area was proposed as a free surface. Effect of Rayleigh numbers (106≤????????≤108) on natural convection and mass flow behavior are analyzed. The governing equations are solved using CFD Fluent code based on the SIMPLE algorithm. The results showed that the cavity with an aspect ratio of AR = 2 has a significant enhancement to raise the rates of both heat and mass transfer. When the Rayleigh number increases, maximum heat transfer rates were observed due to the fluid flow becomes more vigorous. However, mass transfer improves as the Rayleigh number decreases.

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Transient turbulent simulation of natural convection flows induced by a room heater

Cited by 11 publications

References 28 publications

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Review on validation techniques of blade element momentum method implemented in wind turbines

Moist Air Flow Analysis in an Open Enclosure. Part A: Parametric Study

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Transient turbulent simulation of natural convection flows induced by a room heater

Cited by 11 publications

References 28 publications

MHD natural convection of Cu/H2O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H2O nanofluid in a horizontal semi-cylinder with a local triangular heater

Review on validation techniques of blade element momentum method implemented in wind turbines

Moist Air Flow Analysis in an Open Enclosure. Part A: Parametric Study

Contact Info

Product

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MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater