3D Forced Convection in a Box Containing Two Cylindrical Heat Sources

Bouabdallah, Saïd; Ghernaout, Badia; Bellaouar, Abderrahmane; Bouras, Abdelwafi; Ghazel, Abdehamid

doi:10.18280/ama_b.631-404

Cited by 5 publications

(7 citation statements)

References 22 publications

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“…Time marching is handled by the fully implicit scheme. For the convective terms, second order upwind scheme is employed and the algorithm applied for coupling the velocity and pressure fields is SIMPLER (Rahman et al 2009;Bouabdallah et al 2020 ). The convergence is attained when the residuals are less than 10 -4 .…”

Section: Methodsmentioning

confidence: 99%

“…Alshomrani et al (2019) also considered 3D free convection in a cubical cavity with different positions of heater and cooler, and they indicated the significant role of cooler location, Ra number and aspect ratio in the energy transport convective cooling flow inside the enclosure. Recently, Bouabdallah et al (2020) studied numerically the 3D forced convection in a cubic cavity containing two cylindrical heat sources in the middle and Chati et al (2021b) numerically analyzed the turbulent mixed convective heat transfer in a ventilated enclosure with a cylindrical/cubical heat source. They showed that the ventilation efficiency of the cavity including the cylindrical heat source is better.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

3D Numerical Simulation of Turbulent Mixed Convection in a Cubical Cavity Containing a Hot Block

Bouras¹,

Bouabdallah²,

Ghernaout³

et al. 2021

JAFM

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The considerable quantities of heat transfer are dissipated during the operating electronic/electrical systems and have harmful effects on the operating time. So; to keep these systems in good working condition, the location of efficient mechanical cooling systems is essential. The heat transfer rate in an enclosure intensely depends on the combination of geometrical and physical parameters. For this purpose, a 3D Numerical simulation of turbulent mixed convection in a cubical cavity containing an internal heat source in its middle was carried out. The cavity has an inlet port at the lower left face area and an outlet port located in the upper right face area. The analyses are performed for air at ambient circumstances (Pr = 0.71) and the variation of interval for Richardson number (Ri) is chosen between 0.01 and 30 to investigate three situations: dominated forced convection, natural convection, and mixed convection for a fixed dimension of the enclosure in turbulent regimes (Gr = 10 9 ). The effects of the variation of Ri, the dimensionless time, and the dynamic parameters on the thermal flow and fluid flow phenomena are presented and discussed. The obtained results show an exchange between the forces of pressure and of buoyancy in the studied interval and a strong dependence between the geometrical parameters and the heat transfer rate, and then the correlations of the combination of the parameters were proposed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation of Turbulent Mixed Convection in a Cubical Cavity Containing a Hot Block

Bouras¹,

Bouabdallah²,

Ghernaout³

et al. 2021

JAFM

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“…h = 5 W/m² .K and T0 = 300 K). To simulate the airflow under the greenhouse, we have used the software Ansys-Fluent, which solves the Navier-Stokes equations ( [16,17]) using finite volume method. It is proposed to assimilate the plant cover to a porous medium.…”

Section: Figure 1 Geometry Of the Modelmentioning

confidence: 99%

Heat and Fluid Flow in an Open Agricultural Greenhouse in Presence of Plants

Ghernaout¹,

Bouabdallah²,

Atia³

et al. 2021

AMA_B

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Flow convection in agriculture greenhouse is one of the most important factors on the growth and fruiting of plants. The present work focused on natural convection in an open greenhouse heated by ridge tubes in presence of plants. Analyses are performed for different boundary conditions imposed at the roof such as constant temperature, convective heat flux, and convective and radiative heat flux. The governing equations comprising continuity, momentum and energy equations are solved by Ansys-Fluent software. In each case, the average velocity and temperature of the air are determined. The obtained results are presented in terms velocity and temperature profiles. Isothermal lines and velocity vectors showed that by increasing the convective heat transfer coefficient, the average temperature and average airflow velocity decrease. The outcomes of this study help build greenhouses with dimensions and materials to suitable for the given external conditions.

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“…Besides, pure mixed convection for a heated rotating cylinder inside such a cavity was examined by Priam et al [13]. Bouabdallah et al [14] and Kherroubi et al [15] studied similar heat transfer studies for forced and mixed convection utilizing such cavity-shaped geometry and various heated surface conditions. Nosonov et al [16] numerically studied the conjugate mixed convection phenomenon in a rectangular cavity with local heaters.…”

Section: Introductionmentioning

confidence: 99%

“…Bouabdallah et al. [14] and Kherroubi et al. [15] studied similar heat transfer studies for forced and mixed convection utilizing such cavity‐shaped geometry and various heated surface conditions.…”

Section: Introductionmentioning

confidence: 99%

Regulation of mixed convective flow in a horizontal channel with multiple slots using P, PI, and PID controllers

Debnath,

Chowdhury,

Asaduzzaman

et al. 2024

The Journal of Engineering

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This study numerically investigates mixed convective cooling in a two‐dimensional horizontal channel containing periodically heated blocks by applying proportional (P), proportional‐integral (PI), and proportional‐integral‐derivative (PID) controllers. Three different controller configurations regulate the amount of cold air entering the chamber. The air's non‐dimensional temperature is continuously monitored at the set point to compare the controllers’ performance, and the percentage of overshoot and the steady‐state error are analysed. The investigated chamber comprises one inlet and two exit ports, a temperature sensor, and two heated blocks that are isotherm heat sources. The Galerkin finite element approach computationally solves the equations of continuity, momentum, and energy to analyse the thermo‐fluid phenomena occurring within the chamber. Parametric simulation is carried for different values of the proportional gain (Kp = 0.005, 0.010, 0.050 m s−1 K−1), the integral gain (Ki = 0.05, 0.10, 0.15 m s−2 K−1), the derivative gain (Kd = 10−5, 10−4, 10−3 m K−1) to achieve a consistent and expeditious response. Variations of Reynolds, Richardson, and mean Nusselt numbers with time are plotted to compare the system's performance. The investigation indicates that the PI controller produces a comparable level of performance with the PID controller, reducing the necessity to add a derivative controller.

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3D Forced Convection in a Box Containing Two Cylindrical Heat Sources

Cited by 5 publications

References 22 publications

3D Numerical Simulation of Turbulent Mixed Convection in a Cubical Cavity Containing a Hot Block

3D Numerical Simulation of Turbulent Mixed Convection in a Cubical Cavity Containing a Hot Block

Heat and Fluid Flow in an Open Agricultural Greenhouse in Presence of Plants

Regulation of mixed convective flow in a horizontal channel with multiple slots using P, PI, and PID controllers

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