Effect of the angle of attack on the wind convection coefficient

Mahboub, Chawki; Moummi, Noureddine; Moummi, Abdelhafid; Youcef-Ali, S.

doi:10.1016/j.solener.2011.01.008

Cited by 15 publications

(12 citation statements)

References 8 publications

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“…Fig. 3 shows that the use of chicanes as artificial roughness influence significantly on the temperature field, as noted by Aoues et al [11], Mahboub et al [12]. For mass flow rate of 0.035 kg/s, it is observed that the air temperature increasing along the air stream dynamics length with a mean of (316.3 K) in the smooth case and with an average of (324.3 K, 329.5 K, 330.7 K and 332.1 K) in the case (without inclined part, 0°, 45° and 60°) with a rise of (2.52%, 4.17%, 4.55% and 4.99%)respectively.…”

Section: Reynolds Number Effect On the Heat Transfer Coefficientsupporting

confidence: 62%

“…For mass flow rate of 0.035 kg/s, it is observed that the air temperature increasing along the air stream dynamics length with a mean of (316.3 K) in the smooth case and with an average of (324.3 K, 329.5 K, 330.7 K and 332.1 K) in the case (without inclined part, 0°, 45° and 60°) with a rise of (2.52%, 4.17%, 4.55% and 4.99%)respectively. This is due to the secondary flow when it is trapped between two chicanes and the main flow where powered with a brewing phenomenon which provokes a heat transfer from the hot flow to the cold one, therefore the chicanes provide a delaying aspect for more and more time to the heat transfer process which is confirmed by Moummi et al [4][5][6][7][8][9][10][11][12][13]. …”

Section: Reynolds Number Effect On the Heat Transfer Coefficientmentioning

confidence: 98%

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The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

Mahfoud

Moummi

2015

MATEC Web of Conferences

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Abstract.The thermal performance of a single pass solar air heater with chicanes attached was investigated numerically using a 2D model of solar air stream dynamics collectors where the turbulence standard − model has been implemented. The chicane is formed with two parts: the first is perpendicular to the air flow and the second part is titled (α), they are mounted in successive rows, oriented perpendicular to the air flow and soldered to the back plate. The predicted results are validated by comparing with the literatures semi-empirical and experimental data and shown a reasonable agreement. Effects of relevant parameters as the (Reynolds number, chicanes upper parts tilts angles and air mass flow rates) on the heat transfer coefficient and temperature development are discussed. It is apparent that the turbulence created by the chicanes resulting in greater increase in heat transfer inside the air stream dynamics.

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Section: Reynolds Number Effect On the Heat Transfer Coefficientsupporting

confidence: 62%

Section: Reynolds Number Effect On the Heat Transfer Coefficientmentioning

confidence: 98%

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

Mahfoud

Moummi

2015

MATEC Web of Conferences

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“…X=0°, 15°, 30°,45°,60°,75° Comparative result analysis has been done for finned heat sink block with flat plate CFD analysis and experimentation and analytical approach by authors [12][13][14]. It shows that finned block heat sink has a similar behavior to a flat plate under a different angle of attack.…”

Section: Effect Of Ambient Temperaturementioning

confidence: 99%

“…In the present investigation, 4 TEGs (each 40 mm × 40 mm and 3 mm thick) having total power generation capacity of 1.6 W (0.4×4)under a flux of 20,000 W/m 2 [12], are placed in contact in 2×2 configuration within an 80 mm × 80 mm and 2 mm deep machined slot on a 100 mm × 100 mm and 20 mm thick aluminum block which is used as target or spreader. Another aluminum block (base plate) of 100 mm × 100 mm and 20 mm thick is placed over the TEGs upon which 8 rectangular plate fins are attached each having a thickness of 1 mm and length and height as 80 mm and 60 mm respectively.…”

Section: Setup and Computational Modelmentioning

confidence: 99%

“…The heat source was provided by electric heating elements [11]. The authors numerically investigated the effect of a positive angle of attack on the convective heat transfer coefficient [12]. The authors provided an analytical solution for heat and mass transfer for fluids flowing across an isothermal flat plate and new relation were developed [13].…”

Section: Introductionmentioning

confidence: 99%

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A computational approach thermoelectric power generators to estimate heat flux

Nayak¹,

Nayak²

2019

JMES

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This paper focuses on establishing the limiting value of input heat flux for thermoelectric generators (TEG) under different environmental and operating conditions. The current study investigates the limiting input heat flux for TEG’s with allowable hot side temperature of 150.A fin block with 8 fin configuration and fin length of 60 mm is chosen as heat sink configuration for TEG. Computational Fluid Dynamics (CFD) model is developed and analyzed in this work after validation with published experimental results. CFD model consists of 4 TEGs encapsulated within a target block and a finned block, placed within a low speed wind tunnel. Forced laminar air flow in the wind tunnel up to 14 m/s simulates the outdoor wind conditions. Concentrated solar flux is applied to the face of the target block. Effect of ambient air temperature, fin material is studied. Angle of Attack (AOA) and wind direction which arises due to the 2 axis tacking of sun by Fresnel lens concentrator has also been studied and it is observed that maximum heat flux reaches 24,850 W/m2 for the TEG at 14 m/s wind speed, 24,000 W/m2 for 30Angle of Attack (AOA) under 5 m/s wind velocity. It is also observed that maximum heat flux varies by 147.77% with a change in wind velocity from 0 to 5 m/s, while the change is 11.43% when the change from 5 to 14 m/s.

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Experimental evaluation of the wind convection heat transfer on the glass cover of the single‐slope solar still

Rahmani,

Chouaf,

Bouzid

et al. 2024

Heat Trans

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Accurate evaluation of the wind convection heat transfer coefficient (hw) for solar‐based systems is essential, especially for solar desalination systems. Thermal behavior and productivity of solar stills are highly affected by the external heat loss through the glass cover. This paper describes a new experimental approach to estimate the hw on the glass cover of the conventional single‐slope solar distiller (CSS). Indoor experiments have been conducted under steady‐state conditions for a wind speed between 0 and 3 m/s. The hw has been evaluated through an energy balance performed on the distiller's glass cover. The results showed that increasing the wind speed increases the hw (from 5.64 to 31.57 W/m2 K) and enhances the distillation rate (from 5.28 to 7.61 mL/min). A new relationship for the hw was proposed for the CSS and compared with the experimental data available in the literature. The comparison shows that the obtained results are close to the data from solar systems, with a deviation ranging from 27.4% to 37%. However, a significant deviation was obtained with earlier models derived from flat plates (from 29.5% to 59%).

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Effect of the angle of attack on the wind convection coefficient

Cited by 15 publications

References 8 publications

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

The Air Solar Collectors: Introduction of Chicanes to Favour the Heat Transfer and Temperature in the Air Stream Dynamics

A computational approach thermoelectric power generators to estimate heat flux

Experimental evaluation of the wind convection heat transfer on the glass cover of the single‐slope solar still

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