Investigation of impingement heat transfer for air‐sand mixture flow

Al-Dulaimi, Mustafa J.; Rasool, Adnan A. Abdul; Hamad, Faik

doi:10.1002/cjce.22364

Cited by 4 publications

(3 citation statements)

References 20 publications

(50 reference statements)

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“…The conservation equations of mass, momentum and energy are used [16,17]. The model formulated was steady state and turbulent.…”

Section: Governing Equationsmentioning

confidence: 99%

Evaluation of thermal performance for natural and forced draft wet cooling tower

Al-Dulaimi¹,

Kareem²,

Hamad³

2019

JMES

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This paper presents an experimental and numerical investigation of the thermal performance of natural draft wet cooling tower (NDWCT). The experimental investigation is carried out under natural draft condition and forced draft condition created by an axial fan. The operational parameters considered in this study are the thickness of the fill (10 and 20 cm), inlet water temperature (40, 45, and 50 °C) and inlet water volume flow rate (5.68, 7.75, and 9.46 L/min). The experimental results showed that the thermal performance is improved when the fans are used with the NDWCT. The temperature difference between inlet and outlet and effectiveness increase by 35% and 37.2%, respectively at fill thickness of 20 cm and water volume flow rate of 11.35 L/min. The temperature distribution of the air and the relative humidity were numerically simulated for both cases of natural and forced draft by employing the commercial CFD software ANSYS Fluent 15. The experimental and numerical results were validated with results from a previous work and showed a good agreement. The experimental results showed that the effectiveness increase by 22% and 30% for NDWCT and FDWCT respectively when in case of fill thickness 20 cm.

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“…The conservation equations of mass, momentum and energy are used [16,17]. The model formulated was steady state and turbulent.…”

Section: Governing Equationsmentioning

confidence: 99%

Evaluation of thermal performance for natural and forced draft wet cooling tower

Al-Dulaimi¹,

Kareem²,

Hamad³

2019

JMES

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“…Another method to improve the efficiency which includes thermal fluids with increased thermophysical properties of nanofluids. The traditional fluids utilized in the applications of heat transfer were replaced by nanofluids, which were considered to be of high capacity due to their high thermal conductivity [7]; they are commonly utilized in the applications of heat transfer for the purpose of increasing the energy effectiveness of numerous devices [8][9][10]. Different types of thermal solar collectors can be employed to convert solar radiation into thermal energy for heating and cooling applications.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Investigation of a Solar Air Heater for Different Absorber Plate Configurations

Al-Dulaimi¹,

Hilal²,

Hassan

et al. 2023

Int. J. Automot. Mech. Eng.

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In this paper, the effect of using different configurations of absorber plate, including one line finned flat absorber and two lines finned absorber plate, on the thermal performance of a flat plate – double passing solar air heater was investigated experimentally. L- shape fins are soldered on the absorber plate to roughen the absorber plate and generate vortices to enhance the heat transfer between the working fluid (air) and absorber plate to improve the thermal efficiency. The outdoor experimental test was carried out during February and May under the weather conditions of Baghdad city (Longitude 33.3 N and Latitude 44.44 E). The results show that the air temperature is 48 ℃, 47.5 ℃, and 58.5 ℃ at an air velocity of 1.7 m/s for a single line of fins which increased to 52 ℃, 57.5 ℃, and 66 ℃ at air velocity of 0.9 m/s for two lines of fins. The efficiency is increased by 28% for one line of fins and 66% for two lines of fins at an air velocity of 0.9 m/s while increased by 27% for one line of fins and 51% for two lines of fins at an air velocity of 1.7 m/s. The average exergy destruction rate increases by 37.6%, 60.6%, and 68.66% for the absorber plate, working fluid, and glass cover, respectively, for velocity increase from 0.9 m/s to 1.9 m/s. The exergy efficiency increased by 24.1% when the velocity increased from 0.9 m/s to 1.9 m/s.

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“…Not only is this physical situation different from the typical nanofluid heat transfer problem but also it contains different fluid mechanics. It has been well established (Yoshida et al, 1990;Pak and Cho , 1998;Han et al, 2002;Jin-Song et al, 2002;Chiriac and Ortega, 2002;Al-Dulaimi et al, 2016) that a jet whose initial configuration is non-circular, for example, a slot jet, will be subject to a phenomenon called jet axis switching. This phenomenon transforms the jet cross section from skewness in an initial direction to skewness in another direction at right angles to the initial.…”

Section: Introductionmentioning

confidence: 99%

Fluid flow and heat transfer for a particle-laden gas modeled as a two-phase turbulent flow

Gorman

Sparrow

2018

HFF

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Purpose The purpose of this study is to examine the physical processes experienced by a particle-laden gas due to various types of collisions, different heat transfer modalities and jet axis switching. Here, attention is focused on a particle-laden gas subjected to jet axis switching while experiencing fluid flow and heat transfer. Design/methodology/approach The methodology used to model and solve these complex problems is numerical simulation treated here as a two-phase turbulent flow in which the gas and the particles keep their separate identities. For the turbulent flow model, validation was achieved by comparisons with appropriate experimental data. The considered interactions between the fluid and the particles include one-way fluid–particle interactions, two-way fluid–particle interactions and particle–particle interactions. Findings For the fluid flow portion of the work, emphasis was placed on the particle collection efficiency and on independent variables that affect this quantity and the trajectories of the fluid and of the particles as they traverse the space between the jet orifice and the impingement plate. The extent of the effect depended on four factors: particle size, particle density, number of particles and the velocity of the fluid flow. The major effect on the heat transferred to the impingement plate occurred when direct heat transfer between the impinging particles and the plate was taken into account. Originality/value This paper deals with issues never before dealt with in the published literature: the effect of jet axis switching on the fluid mechanics of gas-particle flows without heat transfer and the effect of jet axis switching and the presence of particles on jet impingement heat transfer. The overall focus of the work is on the impact of jet axis switching on particle-laden fluid flow and heat transfer.

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Investigation of impingement heat transfer for air‐sand mixture flow

Cited by 4 publications

References 20 publications

Evaluation of thermal performance for natural and forced draft wet cooling tower

Evaluation of thermal performance for natural and forced draft wet cooling tower

Energy and Exergy Investigation of a Solar Air Heater for Different Absorber Plate Configurations

Fluid flow and heat transfer for a particle-laden gas modeled as a two-phase turbulent flow

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