Numerical Investigation of Heat Transfer Enhancement in a Circular Tube with Rectangular Opened Rings

Altaie, Arkan; Hasan, Moayed R.; Rashid, Farhan Lafta

doi:10.11591/eei.v4i1.331

Cited by 7 publications

(12 citation statements)

References 9 publications

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“…As a consequence, there will be more hot and cold air mixing, which will lead to a more uniform distribution of temperature within the hollow. This was thoroughly validated using [36].…”

Section: Resultsmentioning

confidence: 99%

“…Because forced convection will be stronger than natural convection and the shear wall effect, an increase in air input velocity will result in a rise in the velocity profile. This was thoroughly validated using [38]. 9 depicts the distribution of pressure along the positive y-axis in a channel flow with two 20 W continuous heat sources and varied input air velocities between 0.1 and 1.5 m/s.…”

Section: Resultsmentioning

confidence: 99%

“…As the turbulence of the airflow rises as a result of an increase in the input air velocity, there will be an increase in the pressure distribution. This was thoroughly validated using [39]. With two constant heat source powers of 20 W each, Figure 10 shows the temperature distribution along the positive y-axis in the channel-cavity assembly at varied input velocities ranged from 0.1 to 1.5 m/s.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Mixed Convection Heat Transfer in a Channel-Open Cavity with Two Heat Sources

Rashid¹,

Al-Gaheeshi²,

Rahman³

et al. 2023

IJHT

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With the aid of the COMSOL program, the laminar mixed convection heat transfer in a channel-open cavity with two heat sources of constant 20 W each and varying input air velocity ranges (0.1, 0.5, 1.0, and 1.5 m/s) is numerically determined. In this study, the effect of varying inlet air velocity on the heat transfer characteristics is investigated. Numerical results show that the temperature starts to fall steadily as one moves farther and further away from the site of the two heat sources and closer to the horizontal channel. The higher the velocity of the air entering the cavity, the greater the natural convection that will be created by the heated heat sources. The increase in inlet air velocity will increase the turbulence of airflow and thus increases the pressure distribution. The increase in absolute y-direction decreases the velocity distribution. The rise in the inlet velocity of air will increase the transfer of heat; thus, the Nusselt number will be great when increasing air flow velocity. The maximum Nusselt number is at the interface and reduces with increasing the absolute value of y. A reduction in air temperature and an increase in air density result from an increase in natural convection from the cavity into the air stream caused by an increase in air input velocity.

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“…As a consequence, there will be more hot and cold air mixing, which will lead to a more uniform distribution of temperature within the hollow. This was thoroughly validated using [36].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Mixed Convection Heat Transfer in a Channel-Open Cavity with Two Heat Sources

Rashid¹,

Al-Gaheeshi²,

Rahman³

et al. 2023

IJHT

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“…The conservations of mass, momentum, and energy are the governing equations for incompressible, steady, and twodimensional flow, and they may be expressed as follows [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]: If the x-and y-components of velocity are u and v, g is the gravitational acceleration vector, 𝜌 is the fluid density, P is the pressure, 𝜇 is the fluid dynamic viscosity, 𝛽 is the coefficient of thermal expansion (β=1/Tf), T is the fluid temperature, Tf is the reference fluid temperature, and k is the fluid thermal conductivity. With the exception of the Boussinesq approximation, the fluid characteristics remain constant.…”

Section: Problem Description and Mathematical Formulationmentioning

confidence: 99%

Numerical Analysis in a Lid-Driven Square Cavity with Hemispherical Obstacle in the Bottom

Khalaf¹,

Rashid²,

basem³

et al. 2022

MMEP

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Incompressible fluid flow research uses lid-driven cavity as a benchmark issue to measure computer simulation accuracy. Flow within a hollow includes recirculation, turbulence, eddies, instability, impingement, flow separation, attachment with walls (moving and stationary), fluid entrapment in the recirculation area, and other fluid flow phenomena. In this article, forced convection in a lid-driven square cavity with a sliding top wall and hemispherical obstruction is mathematically illustrated. This chamber filled with Newtonian fluid was exposed to a moving wall (5, 10, 15, and 20 m/s), as selected in the literature. The finite volume technique using the SIMPLER algorithm is used to solve the complete governing equations with the Boussinesq approximation, whereas the analytical approach uses the parallel flow assumption. The moving wall disrupts the cavity's flow field, according to the results. Also, moving wall produces great mixing between the flow field below it and the hollow. The static pressure fluctuates from 0.6 m to 1 m (contact with the moving wall). Also, dynamic pressure increases linearly until 0.7 m, then decreases linearly until 1 (contact with the moving wall). In addition, the inner surface's velocity varies randomly along the location while the others remain constant.

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“…Arkan Al Taie et al [9] presented an investigation of coolant air flow forced convection (10 m/s velocity) in 50 cm long stainless steel circular pipe with 60 mm outer diameter and 30 mm inner diameter at constant hot air surrounding temperature of (1000, 1200 and 1400 K). The well-defined model (k-ε) is used to simulate turbulence in ANSYS -FLUENT 14.5.…”

Section: Fig (1) a Modern Cooling Concepts Of The Gas Turbine Engine [4]mentioning

confidence: 99%

Heat Transfer Enhancement in Air Cooled Gas Turbine Blade Using

Rashid¹,

Azziz²,

Hussein³

2021

Journal of Petroleum Research and Studies

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In this paper, an investigation of using corrugated passages instead of circular crosssection passages was achieved in conditions simulate the case in the gas turbine blade coolingusing ANSYS Fluent version (14.5) with Boundary conditions: inlet coolant air temperature of300 K with different air flow Reynolds numbers (191000, 286000 and 382000). Thesurrounding constant hot air temperatures was (1700 K). The numerical simulations was done bysolving the governing equations (Continuity, Reynolds Averaging Navier-stokes and Energyequation) using (k-ε) model in three dimensions by using the FLUENT version (14.5). Thepresent case was simulated by using corrugated passage of 3 m long, internal diameter of 0.3 m,0.01 m groove height and wall thickness of 0.01 m, was compared with circular cross sectionpipe for the same length, diameter and thickness. The temperature, velocity distributioncontours, cooling air temperature distribution, the inner wall surface temperature, and thermalperformance factor at the two passages centerline are presented in this paper. The coolant airtemperature at the corrugated passage centerline was higher than that for circular one by(12.3%), the temperature distribution for the inner wall surface for the corrugated passage islower than circular one by (4.88 %). The coolant air flow velocity seems to be accelerated anddecelerated through the corrugated passage, so it was shown that the thermal performance factoralong the corrugated passage is larger than 1, this is due to the fact that the corrugated wallscreate turbulent conditions and increasing thermal surface area, and thus increasing heat transfercoefficient than the circular case.

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Numerical Investigation of Heat Transfer Enhancement in a Circular Tube with Rectangular Opened Rings

Abstract: Abstract

Cited by 7 publications

References 9 publications

Mixed Convection Heat Transfer in a Channel-Open Cavity with Two Heat Sources

Mixed Convection Heat Transfer in a Channel-Open Cavity with Two Heat Sources

Numerical Analysis in a Lid-Driven Square Cavity with Hemispherical Obstacle in the Bottom

Heat Transfer Enhancement in Air Cooled Gas Turbine Blade Using

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