Twin Pulsating Jets Impingement Heat Transfer for Fuel Preheating in Automotives

Gitan, Ali Ahmed; Zulkifli, Rozli; Sopian, Kamaruzzaman; Abdullah, Shahrir

doi:10.4028/www.scientific.net/amm.663.322

Cited by 5 publications

(3 citation statements)

References 16 publications

(16 reference statements)

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“…There was a consistency in the results for the heat transfer rate for the surface coated by TiO 2 solution in the most cases compared to other results like [68,70,71] as shown in Figure 23. There is a significant improvement in the result of Nusselt number as against other results such as [29,[66][67][68][69]. There was a consistency in the results for the heat transfer rate for the surface coated by TiO2 solution in the most cases compared to other results like [68,70,71] as shown in Figure 23.…”

Section: Discussionsupporting

confidence: 57%

“…This article presented and discussed the results of the study about the impact of nanocoating concentration on the heat transfer enhancement within the interference zone of the twin impingement jets mechanism. The manuscript presented the application of RSM There is a significant improvement in the result of Nusselt number as against other results such as [29,[66][67][68][69]. There was a consistency in the results for the heat transfer rate for the surface coated by TiO 2 solution in the most cases compared to other results like [68,70,71] as shown in Figure 23.…”

Section: Discussionmentioning

confidence: 70%

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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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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 70%

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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“…Earlier studies indicated that the steady single jet generated a better heat transfer rate compared to that of the pulsating jet at the stagnation point [37]. A velocity increment was noted at the center line of the interference zone, wherein an increasing velocity led to an enhanced heat transfer and a higher Nusselt number [37,38,39,40,41]. Table 2 illustrates the enhancement ratio of the TiO 2- nanocoated surface plate in different models.…”

Section: Resultsmentioning

confidence: 98%

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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A Critical Review of Multiple Impingement Jet Mechanisms for Flow Characteristics and Heat Transfer Augmentation

Abdullah

Jalghaf

Zulkifli

2022

Vehicle and Automotive Engineering 4

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Twin Pulsating Jets Impingement Heat Transfer for Fuel Preheating in Automotives

Cited by 5 publications

References 16 publications

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

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

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

A Critical Review of Multiple Impingement Jet Mechanisms for Flow Characteristics and Heat Transfer Augmentation

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