The empirical correlations for natural convection heat transfer Al2O3 and ZrO2 nanofluid in vertical sub-channel

Kamajaya, Ketut; Umar, Efrizon; Sudjatmi,

doi:10.1088/1757-899x/88/1/012053

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Field emission scanning electron microscopy (FESEM) and Energy Dispersive X-Ray Analysis (EDX) analysis are used to confirm the sizes and the elemental composition of the nanoparticles before preparation of composite nanolubricants. Other researchers [37], [44]- [49], [68], [69] also adapted similar methods in their studies. Figure 1 displays the FESEM image of Al2O3 and SiO2 nanoparticles with average diameter of 13 nm and 30 nm, respectively.…”

Section: Preparation Of Al2o3-sio2/pag Composite Nanolubricantsmentioning

confidence: 99%

Performance Optimization of Automotive Air-Conditioning System Operating with Al2O3-SiO2/PAG Composite Nanolubricants using Taguchi Method

Zawawi

Azmi

Ghazali

et al. 2022

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The performance of an automotive air-conditioning (AAC) system is influenced by a variety of operating conditions. This can be addressed by employing optimization techniques that can suggest the appropriate parameters for the best results. In this study, the optimum operating conditions for a composite nanolubricants-fuelled AAC system were investigate using Taguchi's design of experiment approach and analysis of variance (ANOVA). The motor speed value, initial refrigerant charge, and composite nanolubricants composition ratio were chosen as operating parameters to investigate the AAC system performance, focusing on the coefficient of performance (COP) and compressor work. Orthogonal arrays (ORs) L25 (56) was selected to determine the optimum operating parameters of the AAC system. The optimum values for speed, refrigerant mass, and composition ratio were determined to be A4B1C5 (60:40, 900 rpm and 155 g), respectively. The motor speed was the significant factor influencing both COP and compressor performance by 78.13% and 89.29%. A confirmation test was conducted with the optimum levels of AAC system parameters to verify the efficiency of the Taguchi optimization method. The validation between the optimization results and the experimental results yielded a maximum error of 9.85%, indicating that the findings of this investigation were acceptable.

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Section: Preparation Of Al2o3-sio2/pag Composite Nanolubricantsmentioning

confidence: 99%

Performance Optimization of Automotive Air-Conditioning System Operating with Al2O3-SiO2/PAG Composite Nanolubricants using Taguchi Method

Zawawi

Azmi

Ghazali

et al. 2022

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“…Hasil penelitian ini menunjukkan kenaikan koefisien perpindahan panas konveksi 2 -50%. Sankar dkk [9] telah melakukan eksperimen perpindahan panas konveksi alamiah aliran di dalam anulus vertikal, sedangkan Kamajaya dkk [10] telah melakukan eksperimen perpindahan panas konveksi alamiah aliran nanofluida Al 2 O 3 -air di dalam sub-buluh vertikal. Hasil penelitian-penelitian ini memperlihatkan bentuk-bentuk persamaan korelasi numerik perpindahan panas konveksi alamiah aliran nanofluida di dalam subkanal vertikal.…”

Section: Pendahuluanunclassified

“…Model aliran ini dipilih untuk melengkapi kajian-kajian aliran nanofluida Al 2 O 3 -air di dalam berkas pipa model bahan bakar reaktor guna mendukung kajiaan-kajian keselamatan reaktor, dimana sebelumnya Kamajaya dkk [10] telah melakukan eksperimen perpindahan panas konveksi alamiah aliran nanofluida Al 2 O 3 -air di dalam sub-buluh vertikal. Metoda yang dilakukan dalam peneltian ini menggunakan paket program computer CFD (Computational of Fluid Dynamic).…”

Section: Pendahuluanunclassified

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Karakteristik Perpindahan Panas Konveksi Alamiah Aliran Nanofluida Al2o3-Air Di Dalam Pipa Anulus Vertikal

Nazar

2016

Tri Dasa Mega

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ABSTRAKKARAKTERISTIK PERPINDAHAN PANAS KONVEKSI ALAMIAH ALIRAN NANOFLUIDA AL 2 O 3 -AIR DI DALAM PIPA ANULUS VERTIKAL. Hasil beberapa penelitian menunjukkan bahwa nanofluida memiliki karakteristik termal yang lebih baik dibandingkan dengan fluida konvensional (air). Berkaitan dengan hal tersebut, saat ini sedang berkembang pemikiran untuk menggunakan nanofluida sebagai fluida perpindahan panas alternatif pada sistem pendingin reaktor. Sementara itu, konveksi alamiah di dalam pipa anulus vertikal merupakan salah satu mekanisme perpindahan panas yang penting dan banyak ditemukan pada reaktor riset TRIGA, reaktor daya generasi baru dan alat konversi energi lainnya. Namun di sisi lain karakteristik perpindahan panas nanofluida di dalam pipa anulus vertikal belum banyak diketahui. Oleh karena itu penting dilakukan secara berkesinambungan penelitian-penelitian untuk menganalisis perpindahan panas nanofluida di dalam pipa anulus vertikal. Pada penelitian ini telah dilakukan analisis numerik menggunakan program computer CFD (computational of fluids dynamic) terhadap karakteristik perpindahan panas konveksi alamiah aliran nanofluida Al 2 O 3 -air konsentrasi 2% volume di dalam pipa anulus vertikal. Hasil kajian ini menunjukkan terjadi peningkatan kinerja perpindahan panas (bilangan Nuselt-N U ) sebesar 20,5% -35%. Pada moda konveksi alamiah dengan bilangan 2,471e +09 ≤ R a ≤ 1,955e ABSTRACT THE CHARACTERISTICS OF NATURAL CONVECTION HEAT TRANSFER OF AL 2 O 3 -WATER NANOFLUID FLOW IN A VERTICAL ANNULUS PIPE. Results of several researches have shown that nanofluids have better thermal characteristics than conventional fluid (water). In this regard, ideas for using nanofluids as an alternative heat transfer fluid in the reactor coolant system have been well developed. Meanwhile the natural convection in a vertical annulus pipe is one of the important mechanisms of heat transfer and is found at the TRIGA research reactor, the new generation nuclear power plants and other energy conversion devices. On the other hand, the heat transfer characteristics of nanofluids in a vertical

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“…Ordinary coolants consist of count number in all three states particularly solid, liquid and gas based totally at the requirements of the application and possible mode of heat transfer. However, with the modern technological improvements, an emerging magnificence of new coolants particularly nano-coolants (coolants with dispersed nanoparticles) find their applications in a variety of engineering applications [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Cooling Performance in Automotive Radiator using Al2O3-TiO2-SiO2 Nanofluids

Ramadhan

Azmi

Mamat

et al. 2021

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The use of nanoparticle coolant fluid in the car radiator increases the rate of heat transfer and facilitates the reduction of the overall radiator size. In this study, heat transfer characteristics of tri-hybrid nanofluids-based water/EG (60:40) were analyzed experimental and compared with water/EG (60:40). Four different nanofluids concentrations were prepared by adding 0.05 to 0.3 vol.% of tri-hybrid nanofluids dispersed a mixture of water/ethylene glycol (60:40). Experiments were carried out by varying the flow rate of coolant between 2 to 12 LPM for working temperature of 70 °C, the velocity of airflow remained at an average of 4 m/s, to understand the effect of coolant flow rate on heat transfer. The results showed that the thermal performance of tri-hybrid nanofluids in a water/EG (60:40) mixture has been investigated for volume concentrations of up to 0.3% and working temperature of 70 °C. The maximum enhancement of heat transfer coefficient for air side is observed up to 23.8% at 0.05% volume concentration meanwhile for coolant side is observed at 39.7% at 0.3% volume concentration. The pressure drop and pumping power have the same pattern which increasing in volume concentrations.

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The empirical correlations for natural convection heat transfer Al₂O₃ and ZrO₂ nanofluid in vertical sub-channel

Cited by 5 publications

References 8 publications

Performance Optimization of Automotive Air-Conditioning System Operating with Al2O3-SiO2/PAG Composite Nanolubricants using Taguchi Method

Performance Optimization of Automotive Air-Conditioning System Operating with Al2O3-SiO2/PAG Composite Nanolubricants using Taguchi Method

Karakteristik Perpindahan Panas Konveksi Alamiah Aliran Nanofluida Al2o3-Air Di Dalam Pipa Anulus Vertikal

Experimental Investigation of Cooling Performance in Automotive Radiator using Al2O3-TiO2-SiO2 Nanofluids

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