Numerical Simulation of Water-Based Alumina Nanofluid in Subchannel Geometry

Nazififard, Mohammad; Nematollahi, Mohammadreza; Jafarpur, Khosrow; Suh, Kune Y.

doi:10.1155/2012/928406

Cited by 36 publications

(10 citation statements)

References 28 publications

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“…According to some literature [15,24], thermal conductivity of alumina nanofluids k nf are in good agreement with Maxwell model. Then, Maxwell equation has been used here as follows [25] For viscosity, Brinkman model which is a good prediction of viscosity for alumina nanofluids nf in low concentration of nanoparticles has been taken [26] Local convective heat transfer coefficient (h(z)) and Nusselt number (Nu) are defined as follows [27] where q , D and T w are heat flux, tube diameter and wall temperature, respectively.…”

Section: Physical Properties Of Nanofluidmentioning

confidence: 99%

Numerical simulation of heat transfer improvement in the divertor of fusion reactors by using Al2O3 nanofluid

et al. 2018

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The objective of this work is to study the effect of using nanofluids as coolant on divertor system of fusion reactors which is known to be subjected to high heat loads coming from the plasma. Turbulent force convective heat transfer of water-based Al 2 O 3 nanofluid flowing through the CuCrZr cooling tube of a small scale of mock up made of five tungsten monoblocks has been numerically investigated using single phase model. Computational fluid dynamic approach has been applied by using CFD software FLUENT 6.3.26. The computed results have been validated by traditional corrections expression reported by previous works. The dependence of temperature contours and profiles on volume fraction of nanofluids for different walls of this monoblock has been studied and compared with pure water. The maximum allowed temperature of the candidate material under unusual situation of a fusion reactor has been considered and compared with the maximum temperatures resulted from the CFD results. The effects of various nanofluid concentrations and Reynolds numbers on average Nusselt number have been also investigated. The results show a significant improvement in heat removal from the divertor under the cooling of alumina/water nanofluid with respect to pure water.

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Section: Physical Properties Of Nanofluidmentioning

confidence: 99%

Numerical simulation of heat transfer improvement in the divertor of fusion reactors by using Al2O3 nanofluid

et al. 2018

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“…Following equations are representing the mathematical formulation of the single-phase model and of the continuous phase of the mixture model. The exact k-ε equations contain many unknown and un-measurable term [6][7][8] Energy equation:…”

Section: Governing Equationmentioning

confidence: 99%

“…The upper horizontal line is a wall with Uniform heat flux. The tube consisted with a diameter (D) of 4.5 mm and a length (L) of 1.17 m. Nanofluids is composed of Al 2 O 3 particles and water have the physical properties such as Table.1 [6]. The total flow rate for each fluid model is input at a constant temperature of 293K and the axial velocity is defined as pressure change over time at 100,300,500RPM and the wall surface has a Heat flux of 5000 (w / m2).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Heat Transfer in Unsteady Nanofluids in a Small Pipe with Pulse Pressure

Park¹,

Kim²,

Noh³

et al. 2017

Engineering Journal

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In the present paper, developing turbulence forced convection flows were numerically investigated by using water-Al 2 O 3 nano-fluid through a circular compact pipe which has 4.5mm diameter. Each model has a steady state and uniform heat flux (UHF) at the wall. The whole numerical experiments were processed under the RPM 100 to 500 and the nano-fluid models were made by the Alumina volume fraction. Single-phase fluid models were defined through nano-fluid physical and thermal properties calculations, Two-phase models (mixture granular model) were processed in 100nm diameter. The results show that comparison of nusselt number and heat transfer rate are improved as the Al 2 O 3 volume fraction increased. All of the numerical flow simulations are processed by the FLUENT. The results show an increase from volume fraction concentration and an increase in heat transfer coefficient with increasing RPM.

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“…CFD code merupakan paket program computer yang paling lengkap untuk melakukan analisis termohidrolik saat ini. Nazififard [11] telah menggunakan code ini pada analisis aliran nanofluida Al 2 O 3 -air di dalam sub-buluh tunggal. Sedangkan moda perpindahan panas yang dikaji adalah perpindahan panas konveksi alamiah satu fasa, dimana moda perpindahan panas ini dijumpai aplikasinya pada teknologi reaktor TRIGA dan alat-alat konversi energi yang sejenis lainnya.…”

Section: Pendahuluanunclassified

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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Numerical Simulation of Water-Based Alumina Nanofluid in Subchannel Geometry

Cited by 36 publications

References 28 publications

Numerical simulation of heat transfer improvement in the divertor of fusion reactors by using Al2O3 nanofluid

Numerical simulation of heat transfer improvement in the divertor of fusion reactors by using Al2O3 nanofluid

Numerical Analysis of Heat Transfer in Unsteady Nanofluids in a Small Pipe with Pulse Pressure

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

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