Numerical Study of Forced Convection in a Horizontal Channel with Heated Blocks Due to Oscillation of Incoming Flow

Bouttout, Abdelouahab; Benissaad, Smail; Bessaïh, Rachid

doi:10.1080/10407782.2013.836013

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…This phenomenon clearly illustrates the existence of the optimum frequency for the maximum heat transfer enhancement. The previous works show that the boundary layer thickness becomes much thinner as Strouhal and Reynolds number are increased [23,27].…”

Section: Resultsmentioning

confidence: 99%

“…The governing equations are discretized using the finite volume method while the coupling between velocity and pressure fields is done using the SIMPLER algorithm [27]. The components of velocity ( U and V ) were stored at the staggered locations, and the scalar quantities ( P and θ ) were stored in the centers of these volumes.…”

Section: Methodsmentioning

confidence: 99%

“…The physical system under consideration, as illustrated in Figs. 1 and 2, is power supply box of height H and length L = 40 × H with nine identical blocks (electronic components or electrical devices) spaced uniformly [23][24][25][26][27]. The electronic components are modeled as heated block mounted on the bottom of the box (Fig.…”

Section: Model Of Supply Heat Box With Piezoelectric Fanmentioning

confidence: 99%

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Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

Bouttout

2023

IEEJ Transactions Elec Engng

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Forced convection flow of air through power supply box with piezoelectric fan of nine identical electrical devices has been numerically investigated. This work simulates a practical situation in which periodic temperature is generated in an electrical device as a result of its periodic input voltage. The finite volume method has been adopted to solve the governing equations. The effects of important parameters such as pulsation flow frequencies and temperature modulation frequency on heat transfer rates were investigated in details for Re = 500 corresponding to velocity of 0.39 m/s. The piezoelectric vibration amplitude is fixed at 0.2 and frequencies are varied in the range of [0–3] corresponding to [0–287] Hz. We have found that the time averaged Nusselt number for each electrical device depends on the pulsation frequency and heat modulation, and it is always larger than that in the steady‐state case. The results show that there exists a short band of frequencies which the enhancement of heat transfer of all electrical devices is higher than 55% compared with that of steady state. In addition, the heat transfer is maximum when heated pulsation frequency in the device is set as St = 3.0 corresponding to frequency of 58.5 Hz of input voltage. The combined pulsation flow by piezoelectric fan and heated pulsation by input voltage show vigorous heat transfer through electrical devices blocks and the heat transfer enhancement was observed in relatively narrow bands of frequencies. The efficiency of piezoelectric fan is expressed by the maximum temperature of the ninth electrical device which not exceed 80°C for time‐averaged velocity of 0.556 m/s and vibration frequency of 34.75 Hz of piezoelectric fan. The pressure drop and power pumping of piezoelectric fan are obtained for different Reynolds numbers. We found that the power loss was 4.6 times higher than for the piezoelectric fan at Re = 500. Good agreement between our numerical simulations of piezoelectric fan and experimental results available from the literature is obtained. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Model Of Supply Heat Box With Piezoelectric Fanmentioning

confidence: 99%

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Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

Bouttout

2023

IEEJ Transactions Elec Engng

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“…The heat transfer problem is important because of its many industrial applications, like cooling of electronic systems, aeronautics and compact heat exchangers [1][2][3][4]. Literature survey shows that most of the existing studies of turbulent flow in horizontal channel with an internal arrangement of rectangular blocks are related to forced or mixed convection phenomenon [5][6][7][8] for the objective of improving the heat transfer rate and the understanding of the fundamental flow interactions mechanisms occurring in various industrial technologies. However, many investigations focused on the modeling and optimization of mounted bars and fins along the channel walls to determine the optimum fin height, aspect ratio and spacing between the blocks to obtain a maximum thermal dissipation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Turbulent Heat Transfer in a Horizontal Channel Provided With Square Blocks: Effect of the Inter Blocks Spacing

Amghar

2021

Journal of Thermal Engineering

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In the present paper, numerical simulation is carried out to investigate turbulent flow structure and heat transfer analysis in a two-dimensional horizontal plane channel, contains square blocks arranged in tandem or side by side arrangement. The k-ε model is used to describe turbulence phenomena, and governing equations are solved by a finite volume method, with SIMPLEC algorithm is applied for the coupling of the velocity-pressure variables. The power-law scheme is used for the discretization of the convective terms in the momentum equations. Presented results illustrates the effect of the transverse (GT) and longitudinal (GL) spacing between the blocks on flow structure and heat transfer for a wide range of Reynolds number (10 4 ≤ Re ≤5×10 4). Numerical results show a very good agreement in comparison with available data in the literature.

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“…Bouttout and colleagues conducted a numerical study on a horizontal channel mounted with identically heated blocks exposed to forced convection pulsating flow. They concluded that the heat transfer coefficient was enhanced by pulsation of flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of Prandtl number on the average exit temperature of coolant in a heat‐generating vertical parallel plate channel: A conjugate analysis

Afzal

Kaladgi

et al. 2018

Heat Trans. Asian Res.

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A coupled conduction–convection heat transfer analysis is carried out for a two‐dimensional rectangular, vertical parallel plate channel producing volumetric energy (uniform and nonuniform), subjected to laminar forced‐convection incompressible fluid flow under steady‐state conditions. The equations governing the thermal and flow field are solved by using finite difference method, and the resulting algebraic equations are solved by using the tridiagonal matrix algorithm method. Four coolants with their Prandtl numbers (Pr), namely, liquid sodium (Pr = 0.005), sodium‐potassium (Pr = 0.00753), lead (Pr = 0.02252), and helium (Pr = 0.666) are used for the present conjugate analysis. Effects of different thermal and fluid flow parameters such as Reynolds number (ReH) ranging from 500 to 1500, conduction–convection parameter (Ncc), and total heat generation (Qt) on average exit temperature (θae) of coolants are studied. From the obtained results, it is found that the θae of coolant strongly depends on Pr, ReH, Ncc, and Qt when the aspect ratio (Ar) is kept constant. It is also found that with a nonuniform rate of heat generation, the coolant θae is high compared to uniform heat generation rate, whereas with increasing Ncc, the θae decreases, and with increasing Qt, the θae increases irrespective of coolants.

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Numerical Study of Forced Convection in a Horizontal Channel with Heated Blocks Due to Oscillation of Incoming Flow

Cited by 6 publications

References 20 publications

Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

Numerical Study of Turbulent Heat Transfer in a Horizontal Channel Provided With Square Blocks: Effect of the Inter Blocks Spacing

Effect of Prandtl number on the average exit temperature of coolant in a heat‐generating vertical parallel plate channel: A conjugate analysis

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