Dynamic and thermal study of air flow control by chicanes with inclined upper parts in solar air collectors

Mahfoud, Omar; Moummi, Abdelhafid; Kadja, Mahfoud; Moummi, Noureddine; Mebrouk, Ridha

doi:10.1080/14786451.2013.821125

Cited by 6 publications

(7 citation statements)

References 20 publications

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“…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 Coefficientsupporting

confidence: 53%

“…In Fluent, the Standard − model is the most widely used because of its robustness and is therefore valid only for fully turbulent flows, precision and relatively its low cost in computation time. This model is an example of two-equation models; turbulent kinetic energy and dissipation rate are obtained from the following equations, Mahfoud et al [10].…”

Section: Mathematical Modellingmentioning

confidence: 99%

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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: 53%

Section: Mathematical Modellingmentioning

confidence: 99%

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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“…The geometrical characteristics such as length, width, spacing between the ribs are chosen based on the study carried out by Mahfoud et al [12]. The main geometrical features of the tested model are summarized in Table 1.…”

Section: Geometry Parameters and Motion Modelingmentioning

confidence: 99%

CFD analysis of solar air collector equipped with flexible ribs

Bouzaher

Baissi

abdelbasset

2016

J Braz. Soc. Mech. Sci. Eng.

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h c Convective heat transfer coefficient W m −2 K −1 h(x) Instantaneous ribs position along the x-axis h(y) Instantaneous ribs position along the y-axis k Thermal conductivity W m −1 K −1 L Solar collector length (m) m Mass flow rate Nu Nusselt number P Spacing between ribs (m) Re Reynolds number (ρUD h /µ) T Temperature (K) t Instant time (s) U Incoming flow velocity (m s −1) U Mean velocity in channel (m s −1) Greek letter η Thermal enhancement factor = ((Nu/Nu 0)/(f/f 0)) 1/3 μ Dynamic viscosity ρ Density

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“…The simulation is one way to predict the heat transfer. The convective heat transfer and fluid flow over a backward facing step have been widely investigated both numerically [6]- [11] and experimentally [12]. Numerous recent studies for different types of fluids materials have been undertaken [13]- [16], in different forms of ducts [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and fluid flow of Biodiesel at a backward-Facing step

et al. 2020

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You should Three-dimensional simulation of a biodiesel fluid flow within a rectangular duct over a backward-facing step is investigated in the present paper. The fluid, which obeys to the Newtonian rheological behavior, is obtained by transformation of Algerian waste cooking oil into a biodiesel. Flow through a rectangular channel subjected to a constant wall temperature or constant heat flux as boundary conditions. The partial differential equations governing fluid flow and heat transfer are solved by the Fluent CFD computational code based on the Finite Volume Method. The numerical experiments are carried out to examine the effect of the Reynolds number by fluid inlet velocity variation for the two boundary conditions. The results are analyzed through the distribution of the temperature and the velocity contours. The variation of the Reynolds number and boundary conditions affects greatly the heat transfer and the fluid flow, in particular near the step region.

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Dynamic and thermal study of air flow control by chicanes with inclined upper parts in solar air collectors

Cited by 6 publications

References 20 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

CFD analysis of solar air collector equipped with flexible ribs

Heat transfer and fluid flow of Biodiesel at a backward-Facing step

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