Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

Abdullah, Mahir Faris; Zulkifli, Rozli; Harun, Zambri; Abdullah, Shahrir; Ghopa, Wan Aizon Wan

doi:10.3390/en11040927

Cited by 8 publications

(8 citation statements)

References 17 publications

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“…A ball valve controlled every pipeline to ensure similar flow characteristics of the twin jets. A square aluminum foil sensor (30 × 30 × 0.4 cm) along with a heat flux-temperature foil sensor were installed on the foil surface using a Kapton tape compound and a high-conductivity heat sink for reducing the effects of the air gap trapped between the aluminum surface and the sensor [2,4]. This foil ensured a flatter impingement surface, which further helped in acquiring a Re number of 17,000 for measuring the heat transfer/unit time ( q ) from a data logger and estimating the convective HTC ( h ) (W/(m²·K)).…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Impact of the TiO2 Nanosolution Concentration on Heat Transfer Enhancement of the Twin Impingement Jet of a Heated Aluminum Plate

et al. 2019

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Here, the researchers carried out an experimental analysis of the effect of the TiO2 nanosolution concentration on the heat transfer of the twin jet impingement on an aluminum plate surface. We used three different heat transfer enhancement processes. We considered the TiO2 nanosolution coat, aluminum plate heat sink, and a twin jet impingement system. We also analyzed several other parameters like the nozzle spacing, nanosolution concentration, and the nozzle-to-plate distance and noted if these parameters could increase the heat transfer rate of the twin jet impingement system on a hot aluminum surface. The researchers prepared different nanosolutions, which consisted of varying concentrations, and coated them on the metal surface. Thereafter, we carried out an X-ray diffraction (XRD) and a Field Emission Scanning Electron Microscopy (FESEM) analysis for determining the structure and the homogeneous surface coating of the nanosolutions. This article also studied the different positions of the twin jets for determining the maximal Nusselt number (Nu). The researchers analyzed all the results and noted that the flow structure of the twin impingement jets at the interference zone was the major issue affecting the increase in the heat transfer rate. The combined influence of the spacing and nanoparticle concentration affected the flow structure, and therefore the heat transfer properties, wherein the Reynolds number (1% by volume concentration) maximally affected the Nusselt number. This improved the performance of various industrial and engineering applications. Hypothesis: Nusselt number was affected by the ratio of the nanoparticle size to the surface roughness. Heat transfer characteristics could be improved if the researchers selected an appropriate impingement system and selected the optimal levels of other factors. The surface coating with the TiO2 nanosolution also positively affected the heat transfer rate.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…Very few approaches have been used for solving these challenges. In one such approach, the heat transfer could be increased by improving the performance of the impingement jet system [1,2,3,4]. Studies also noted that the nanofluids were a feasible coolant that improved the performance efficiency of several engineering devices [5].…”

Section: Introductionmentioning

confidence: 99%

Impact of the TiO2 Nanosolution Concentration on Heat Transfer Enhancement of the Twin Impingement Jet of a Heated Aluminum Plate

et al. 2019

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“…The enhancement of heat transfer is the process of increasing the effectiveness of heat exchanges between two mediums. In industrial applications, jet impingement cooling is widely employed, such as in electronic chip cooling, gas turbine aerofoil cooling and vehicle heat exchangers [1][2][3][4]. Jet impingement offers intensive and local heat transfer, which makes it more adaptable to face heat transfer issues with different geometries and conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This work is representative of the serial publication for our previous papers dealing with the enhancement of heat transfer by using twin impingement jet technique and surface coating [2][3][4] here, we use DOE to analyze the influential parameters studied as the spacing between the nozzles, velocity, concentration of nanosolution coating and nozzle-plate distance, which are considered to be effective parameters for the thermal conductivity and the heat transfer coefficient of TiO 2 nanoparticle. In this article the heat transfer rate could be increased by surface coating with TiO 2 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Assessment of TiO2 Nanoconcentration and Twin Impingement Jet of Heat Transfer Enhancement—A Statistical Approach Using Response Surface Methodology

et al. 2021

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Impinging jets are considered to be a well-known technique that offers high local heat transfer rates. No correlation could be established in the literature between the significant parameters and the Nusselt number, and investigation of the interactions between the correlated factors has not been conducted before. An experimental analysis based on the twin impingement jet mechanism was achieved to study the heat transfer rate pertaining to the surface plate. In the current paper, four influential parameters were studied: the spacing between nozzles, velocity, concentration of Nano solution coating and nozzle-plate distance, which are considered to be effective parameters for the thermal conductivity and the heat transfer coefficient of TiO2 nanoparticle, an X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analysis were done, which highlighted the structure and showed that the nanosolution coated the surface homogenously. Moreover, a comparison was done for the experimental results with that of the predicted responses generated by the Design Expert software, Version 7 User’s Guide, USA. A response surface methodology (RSM) was employed to improve a mathematical model by accounting for a D-optimal design. In addition, the analysis of variance (ANOVA) was employed for testing the significance of the models. The maximum Nu of 91.47, where H = S = 1 cm; Reynolds number of 17,000, and TiO2 nanoparticle concentration of 0.5% M. The highest improvement rate in Nusselt was about 26%, achieved with TiO2 Nanoparticle, when S = 3 cm, H = 6 cm and TiO2 nanoparticle = 0.5 M. Furthermore, based on the statistical analysis, the expected values were found to be in satisfactory agreement with that of the empirical data, which was conducted by accounting for the proposed models’ excellent predictability. Multivariate approaches are very useful for researchers, as well as for applications in industrial processes, as they lead to increased efficiency and reduced costs, so the presented results of this work could encourage the overall uses of multivariate methods in these fields. Hypotheses: A comparison was done for the predicted responses generated by the Design Expert software with the experimental results and then studied to verify the following hypotheses: ► Preparation of three concentrations of TiO2 nanosolution was done and studied. ► The heat transfer rate could be increased by surface coating with TiO2 nanoparticle. ► The heat transfer could be improved by the impingement jet technique with suitable adjustments.

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“…Sharif [12] investigated inclined twin slot-jet impingement numerically and studied the influence of impingement angle on heat transfer distribution on the impingement surface. Faris et al [13] conducted both an experimental and numerical study of twin jet impingement and studied the mechanism of heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fountain Formation due to Normal and Inclined Twin-Jet Impingement on Ground

Zhang

Agarwal

2020

Fluids

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The goal of this paper is to study numerically the flow physics of a fountain formed by twin-jet impingement on ground. The incompressible Reynolds-Averaged Navier-Stokes (RANS) equations with realizable k-ε and WA (Wray-Agarwal) turbulence model are employed in the numerical simulations with ANSYS Fluent. A series of numerical simulations for straight and inclined fountain formations are conducted by changing the geometric and flow parameters of twin jets and distance between them. The changes in parameters include variations in the jet Reynolds number from 2 × 104 to 8 × 104, impingement height, distance between the centerlines of the two jets from 1.4D to 16D where D is the jet diameter, and ratio of the Reynolds number of the two jets from 1 to 4. It is shown that different Reynolds numbers of the two jets can result in a fountain that inclines towards the jet with smaller Reynolds number. Detailed flow field simulations for a large number of cases are presented, and the flow physics of fountain formation is analyzed for the first time in the literature.

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Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

Cited by 8 publications

References 17 publications

Impact of the TiO2 Nanosolution Concentration on Heat Transfer Enhancement of the Twin Impingement Jet of a Heated Aluminum Plate

Impact of the TiO2 Nanosolution Concentration on Heat Transfer Enhancement of the Twin Impingement Jet of a Heated Aluminum Plate

Assessment of TiO2 Nanoconcentration and Twin Impingement Jet of Heat Transfer Enhancement—A Statistical Approach Using Response Surface Methodology

Numerical Simulation of Fountain Formation due to Normal and Inclined Twin-Jet Impingement on Ground

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