The characteristic length on natural convection from a horizontal heated plate facing downwards

Kozanoglu, Bulent; Rubio, Francisco Javier Pallarés

doi:10.2298/tsci110127087k

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…Q̇s en and Q̇l at are the interphase sensible heat and latent heat flux, respectively; h L (T S , p) is the saturated enthalpy of the liquid phase; h denotes the convection heat transfer coefficient between vapor and liquid phase. For convective heat transfer, the empirical relationship from Kozanoglu and Rubio [38,39] is used:…”

Section: Heat Transfer Calculationmentioning

confidence: 99%

Dynamic boil-off characterization for discharge process of LNG vehicle tank

Deng

Liang

Wu³

et al. 2019

Energy

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Section: Heat Transfer Calculationmentioning

confidence: 99%

Dynamic boil-off characterization for discharge process of LNG vehicle tank

Deng

Liang

Wu³

et al. 2019

Energy

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“…Samie et al [3] analytically analyzed the natural-convection heat transfer below a hot horizontal isothermal flat strip of infinite length. Kozanoglu and Rubio [4] introduced a Nusselt number correlation for the natural-convection from a downward facing horizontal heated plate in which the characteristic length is defined based on the thermal boundary-layer thickness. The natural-convection flows over a semi-infinite horizontal plate subjected to variable heat flux or variable wall temperature have been presented in [5,6].…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic free convection of non-Newtonian power-law fluids over a uniformly heated horizontal plate

Bahmani

Kargarsharifabad

2020

THERM SCI

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The MHD free convection flow of non-Newtonian power-law fluids over a horizontal plate subjected to a constant heat flux is studied. The results are presented for various values of the three influential parameters, i. e. the generalized Hartmann number, the generalized Prandtl number, and the non-Newtonian power-law viscosity index. Increasing the Hartmann number increases the thermal boundary-layer thickness and the surface temperature and consequently decreases the wall skin friction and Nusselt number. A lower generalized Prandtl number results in a larger skin friction coefficient and higher wall temperature as well as thicker thermal boundary-layer. The viscosity index is predicted to influence the flow conditions depending on the value of generalized Hartmann number. At high generalized Prandtl number numbers, by decreasing non-Newtonian power-law index, the wall skin friction, temperature scale, and thermal boundary-layer thickness are increased and the Nusselt number is decreased, while the opposite trend is observed for low generalized Prandtl number. A general correlation for the Nusselt number is derived using the numerical results.

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“…provided a one-dimensional model for containment in AP1000 nuclear power plant based on thermal stratification [5], Janusz Dziak et al have provided the results of numerical simulation of the cooling process through a thin layer of water [6], Ye Cheng et al have studied numerically passive cooling process in a relatively long period of time numerically[7]. Hendro Tjahjono [8] has developed a MATLAB-based analysis program for the optimal splash flow rate to produce the highest heat transfer capability, and Kozanoglu et al [9] have also contributed to publish the results of research on cooling through evaporation of a thin layer. Containment volume effect on the pressure and temperature during LOCA in AP1000 reactor containment has been studied by Farzad Choobdar Rahim [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Air Condition on Ap-1000 Containment Cooling Performance in Station Black Out Accident

Tjahjono

2015

Tri Dasa Mega

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EFFECT OF AIR CONDITION ON AP-1000 CONTAINMENT COOLING PERFORMANCE IN STATION BLACK OUT ACCIDENT. AP1000 reactor is a nuclear power plant generation III+ 1000 MWe which apply passive cooling concept to anticipate accidents triggered by the extinction of the entire supply of electrical power or Station Black Out (SBO). In the AP1000 reactor, decay heat disposal mechanism conducted passively through the PRHR-IRWST and subsequently forwarded to the reactor containment. Containment externally cooled through natural convection in the air gap and through evaporation cooling water poured on the outer surface of the containment wall. The mechanism of evaporation of water into the air outside is strongly influenced by the conditions of humidity and air temperature. The purpose of this study was to determine the extent of the influence of the air condition on cooling capabilities of the AP1000 containment. The method used is to perform simulations using Matlab-based analytical calculation model capable of estimating the power of heat transfered. The simulation results showed a decrease in power up to 5% for relative humidity rose from 10% to 95%, while the variation of air temperature of 10 °C to 40°C, the power will decrease up to 15%. It can be concluded that the effect of air temperature increase is much more significant in lowering the containment cooling ability compared with the increase of humidity. Keywords: containment cooling, AP1000, air condition, SBO ABSTRAK PENGARUH KONDISI UDARA TERHADAP KINERJA PENDINGINAN SUNGKUP AP-1000 DALAM KECELAKAAN STATION BLACK OUT. Reaktor AP-1000 merupakan PLTN generasi III+ berdaya 1000 MWe yang menerapkan konsep pendinginan pasif untuk mengantisipasi terjadinya kecelakaan yang dipicu oleh padamnya seluruh suplai daya listrik atau dikenal dengan Station Black Out (SBO). Pada reaktor AP-1000, mekanisme pembuangan kalor peluruhan dilakukan secara pasif melalui PRHR yang diteruskan ke IRWST dan selanjutnya pada sungkup reaktor. Sungkup didinginkan secara eksternal melalui konveksi alamiah pada celah udara dan melalui penguapan air pendingin yang diguyurkan di permukaan luar dinding sungkup. Mekanisme penguapan air ke udara luar sangat dipengaruhi oleh kondisi kelembaban dan temperatur udara. Tujuan dari penelitian ini adalah untuk mengetahui sejauh mana pengaruh kondisi udara tersebut terhadap kemampuan pendinginan dari sungkup AP1000. Metode yang digunakan adalah dengan melakukan simulasi menggunakan model perhitungan analitis berbasis Matlab yang mampu mengestimasi daya kalor yang dievakuasi. Hasil simulasi menunjukkan adanya penurunan daya hingga 5% untuk kelembaban relatif naik dari 10% hingga 95%, sedangkan untuk variasi temperatur udara dari 10°C hingga 40°C, daya akan menurun hingga 15%. Dapat disimpulkan bahwa pengaruh kenaikan temperatur udara jauh lebih signifikan dalam menurunkan kemampuan pendinginan sungkup dibandingkan dengan naiknya kelembaban. Kata kunci: pendinginan sungkup, AP1000, kondisi udara, SBO

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The characteristic length on natural convection from a horizontal heated plate facing downwards

Cited by 9 publications

References 21 publications

Dynamic boil-off characterization for discharge process of LNG vehicle tank

Dynamic boil-off characterization for discharge process of LNG vehicle tank

Magnetohydrodynamic free convection of non-Newtonian power-law fluids over a uniformly heated horizontal plate

Effect of Air Condition on Ap-1000 Containment Cooling Performance in Station Black Out Accident

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