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RISS 인기검색어
- 검색키워드
- 저자 : Tehmina AMBREEN (검색결과 4 건)
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Ambreen, Tehmina,Kim, Man-Hoe Elsevier 2017 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.115 No.2
<P><B>Abstract</B></P> <P>In the present study, laminar forced convection of Al<SUB>2</SUB>O<SUB>3</SUB> +water and TiO<SUB>2</SUB> +water nanofluids in the respective micro and mini channels has been investigated under constant heat flux boundary condition. The effectiveness of homogeneous, discrete phase model and Eulerian-Eulerian (Mixture, Volume of Fluid, Eulerian) models has been evaluated for experimental conditions reported by Karimzadehkhouei et al. (2015) and He et al. (2009). Hydrothermal characteristics of Al<SUB>2</SUB>O<SUB>3</SUB> +water ( <SUB> d p </SUB> = 20 nm ) nanofluid have been studied for 0.25%, 0.5% and 2% particle volume fractions in Reynolds number range of 200–2000 whereas 0.24%, 0.6% and 1.18% particle volume fractions of TiO<SUB>2</SUB> +water ( <SUB> d p </SUB> = 21 nm ) has been studied at 900 and 1500 Reynolds numbers. Results illustrate that for all nanoparticle volume fractions under consideration, discrete phase model (DPM) estimates most satisfactory hydrothermal results. For higher thermal conductive nanofluids, single phase model underestimates while Eulerian-Eulerian models over predict thermal fields. Though all the numerical models determine fairly analogous friction factor with respect to experimental as well as theoretical results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Numerical investigation of laminar forced convection of nanofluids in mini channels. </LI> <LI> Thermal hydraulic performance of Al<SUB>2</SUB>O<SUB>3</SUB> +water and TiO<SUB>2</SUB> +water nanofluids. </LI> <LI> Comparative assessment of homogeneous, discrete phase and Eulerian-Eulerian models. </LI> </UL> </P>
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Ambreen, Tehmina,Saleem, Arslan,Park, Cheol Woo Elsevier 2019 Powder technology Vol.345 No.-
<P><B>Abstract</B></P> <P>In the present study, the thermofluid characteristics of a water and nanofluid-cooled micropin-fin heat sink have been evaluated by implementing a two-phase Eulerian-Lagrangian model. The nanofluid consisted of an aqueous suspension of the spherical-shaped alumina nanoparticles with the particle volume fraction (<I>φ</I>) ranging from 0.25% to 1%. The analysis has been performed by considering a heat sink comprising the staggered arrangement of 72 micropin-fins of the circular cross-section without tip clearance. A constant heat flux of 300 kW/m<SUP>2</SUP> was subjected at the base of the heat sink, whilst the utilised pressure drop (<I>∆P</I>) across the heat sink was limited to <I>∆P</I><3000<I>Pa</I>. Heat transfer and fluid flow parameters were evaluated in terms of the local heat transfer coefficient, the enhancement ratio of the average convective heat transfer coefficient, thermal resistance and volume flow rate through the heat sink. Additionally, the temperature contours and flow streamlines across the heat sink elaborated the temperature distribution and flow attributes. Results indicated that under identical <I>∆P</I> conditions, replacing water coolants with nanofluids optimised the thermal performance of the heat sink with a perceptible margin at the higher particle loadings. At the optimal pressure drop and particle concentration, nanoparticle dispersion into the hosting fluid demonstrated a maximum of 16% enhancement in the average heat transfer coefficient.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermofluid characteristics of nanofluid cooled micro pin-fin heat sink are investigated. </LI> <LI> Aqueous based alumina nanofluid with particle volume fraction 0–1% has been studied. </LI> <LI> Addition of nanoparticles into the base fluid enhances heat transfer coefficient </LI> <LI> Increasing particle concentration and flow rate improves heat transfer enhancement. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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