Numerical Study of Air Forced Convection in a Channel Provided With Inclined Ribs

Manca, Oronzio; Nardini, Sergio; Ricci, Daniele

doi:10.5098/hmt.v2.1.3007

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…The presence of ribs in the channels generated a turbulence flow and the thermal boundary layer thickness are reduced by separating the laminar sub-layer if compared with the smooth channel, and this drives to an increase in the heat transfer rate. This work can be accomplished by maintaining the height of the roughness parts small compared with the dimensions of the (Manca et al, 2011;. Understanding the conduct of the mixture in rectangular channel with rib is requiring due to the common apparition of this phenomenon in a thermal engineering systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Semi-Circle Rib on Heat Transfer Coefficient in a Rectangular Channel

Fadhil¹,

Al-Turaihi²,

Abed³

2020

Frontiers in Heat and Mass Transfer

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In this paper an experimental and numerical analysis has been conducted to study the effect of heat transfer and filed flow of two-phase flow (water and air) through a rectangular ribbed channel. The study has involved the several values of heat flux (120,140,160 Watts), air and water superficial velocity (1.096, 1.425, 1.644, 1.864, and 2.193 m/s) and (0.0421, 0.0842, and 0.1474 m/s), respectively. The distribution of temperature along the channel was photographed using thermal camera and compared with numerical results . The experimental test system was fabricated of vertical rectangular channel with cross section of (0.08m × 0.03m) and a length (0.7 m) to analyze the behavior of the mixture (water-air) over the heated plate (semi-circle ribs ). The computational fluid dynamics CFD software was utilized to simulate the governing equations with initial and boundary conditions. Results found that the ribbed channel give the high heat transfer rate compared to the smooth channel. The percentage deviation between the experimental and numerical data is (1.0% -6.0% ). The results proved that the flow is growing to become turbulent, eddies develop about the heated plate (rib), the temperature at the outlet decreases and heat transfer coefficient improved by adding ribs, it also improved when the velocities of the flow increased.

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Section: Introductionmentioning

confidence: 99%

Effect of Semi-Circle Rib on Heat Transfer Coefficient in a Rectangular Channel

Fadhil¹,

Al-Turaihi²,

Abed³

2020

Frontiers in Heat and Mass Transfer

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“…An existing passive approach is defined by employing special surface geometries or fluid additives, and roughed surfaces anything that results in enhanced thermal performance. Whereas the active approaches comprise electric or acoustic fields, surface vibration, and mechanical aids merely the approaches requiting the external source of power [7]. A sufficient technique is using grooves or ribs in channels.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD Analysis of Two-Phase Forced Convection Flow in Channels of Various Rib Shapes

Abed

Kareem

Majdi³

et al. 2020

ARFMTS

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This paper investigates numerically and experimentally heat transfer forced convective two-phase flow (i.e. air and water) over a rectangular ribbed channel with a vertical orientation. Three distinct rib–groove shapes have been examined. Ribs - groove shapes are; Triangle, Trapezoid, and Semi-Trapezoid ribs-groove. The present study has been performed with continuous heat flux through range of water and air superficial inlet velocity values between 0.105 – 0.316m/s, and 0.263 – 1.320 m/s, respectively. Continuity, momentum and energy calculations have been formulated using the Finite Volume Approach (FVM). Results indicate that the triangle rib-groove has the high heat transfer coefficient and lower temperature difference than other cases against a different number of Reynolds. The experimental data has been compared to numerical results for ribs –grooved channel with deviation of about 1.0% - 7.5%. The channel fitted with triangle ribs shows the highest heat transfer, which is about 59% higher than the smooth channel; 56% for trapezoidal rib, and 44% for channel fitted by semi-trapezoidal rib. Finally, the triangle rib-groove gives a better heat transfer improvement value in comparison with trapezoidal and semi trapezoidal rib-groove channel at constant pumping power.

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“…Passive techniques include additives of fluid, devices of swirl flow, extended and coated surfaces, and roughed surfaces anything that include applying special surface geometry. While active techniques include vibration of surface, acoustic or electric fields, and mechanical aids simply the techniques that requisite external power source (Manca et al 2011). Channels and pipes that roughed with ribs or grooves are widely used in several applications such as ventilation, turbine blades, heat exchangers, and refrigeration.…”

Section: Introductionmentioning

confidence: 99%

Enhancement the Heat Transfer for Two-Phase Flow Through a Rectangular Ribbed Vertical Channel

Al-Turaihi¹,

Kareem²

2018

IQJMME

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The heat transfer coefficient and temperature distribution of two phase flow (water, air)in rectangular ribbed vertical channel was investigated experimentally and numerically inthis work for different values of water and air superficial velocities (0.0421, 0.0842, 0.1158,0.1474 and 0.1684 m/s) and (1.0964, 1.425, 1.644, 1.864 and 2.193 m/s), respectively, atconstant heat flux (120 W). The distribution of temperature along the channel wasphotographed using thermal camera and compared with images for the correspondingcontours which found numerically. The experimental results of heat transfer coefficientcompared with computational fluid dynamics model simulated by Ansys fluent 15.0. Agood agreement has been found between the experimental and numerical data, where thepercentage deviation between the experimental and the numerical results is (1% - 6% ). Theresults showed that, the local heat transfer coefficient increased by adding ribs, it alsoincreased as the velocity of the flow increased.

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Numerical Study of Air Forced Convection in a Channel Provided With Inclined Ribs

Cited by 8 publications

References 20 publications

Effect of Semi-Circle Rib on Heat Transfer Coefficient in a Rectangular Channel

Effect of Semi-Circle Rib on Heat Transfer Coefficient in a Rectangular Channel

Experimental and CFD Analysis of Two-Phase Forced Convection Flow in Channels of Various Rib Shapes

Enhancement the Heat Transfer for Two-Phase Flow Through a Rectangular Ribbed Vertical Channel

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