Natural convection of alumina-water nanofluid in an open cavity having multiple porous layers

Мирошниченко, И. В.; Sheremet, Mikhail А.; Öztop, Hakan F.; Abu‐Hamdeh, Nidal H.

doi:10.1016/j.ijheatmasstransfer.2018.04.108

Cited by 85 publications

(28 citation statements)

References 24 publications

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“…Because of the increasing demand for improvements in a heat exchanger's performance, new heat transfer transport fluids called nanofluids were introduced towards the end of the last century. The term 'nanofluid' was first introduced by Choi in 1995 [1], after which many researchers investigated (i) the preparation and thermophysical properties of nanofluids [2][3][4][5][6][7], (ii) forced convection using nanofluids in heat exchangers [8][9][10][11][12][13][14], and (iii) the natural convection of nanofluids in cavities [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of convection heat transfer in the transition flow regime of aluminium oxide-water nanofluids in a rectangular channel

Osman

Sharifpur

Meyer

2019

International Journal of Heat and Mass Transfer

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The growing demand for energy worldwide requires that attention be given to designing and operating heat exchangers and thermal devices to utilise and save thermal energy. There is a need to find new heat transport fluids with better heat transfer properties to increase convective heat transfer, and nanofluids have been shown to be good alternatives to conventional heat transport fluids. Although extensive research has been done on the properties of nanofluids in recent decades, there is still a lack of research on convection heat transfer involving nanofluids, particularly in the transitional flow regime. This study investigated the convective heat transfer of a one-step prepared alumina-water nanofluid. A uniformly heated rectangular channel was experimentally investigated. Nanofluids with volume concentrations of 0.3, 0.5, and 1% were used, and a Reynolds number range of 200-7 000 was considered, which included laminar and turbulent flows, as well as the transition regime from laminar to turbulent flow. The temperatures and pressure drops were measured to evaluate the heat transfer coefficients, Nusselt numbers, and pressure drop coefficients. The results showed enhancements of the heat transfer coefficients for the nanofluids used. The 1.0% nanofluid showed the maximum enhancements, with values of 54% in the transition flow regime and 11% in the turbulent regime. The convective heat transfer efficiency in the transition flow regime was observed to be better than those in the turbulent and laminar flow regimes.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of convection heat transfer in the transition flow regime of aluminium oxide-water nanofluids in a rectangular channel

Osman

Sharifpur

Meyer

2019

International Journal of Heat and Mass Transfer

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“…Such approach illustrates that the nanoadditives are uniformly included in the host liquid. Moreover, using the single-phase model with experimentally-based correlations for physical properties is more effective in comparison with two-phase nanoliquid models and experimental data [22,23]. Using the Boussinesq approach, the basic equations managing these phenomena can be formulated in dimensional form as [24]: Using the Boussinesq approach, the basic equations managing these phenomena can be formulated in dimensional form as [24]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Thermal Convection of Nanoliquid in a Double-Connected Chamber

2020

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Thermogravitational convective thermal transmission, inside a square differentially-heated chamber with a nanoliquid, has been examined in the presence of internal adiabatic or a thermally-conducting solid body. A single-phase nanoliquid approach is employed, based on the experimentally-extracted relations for nanofluid heat conductivity and dynamic viscosity. The governing equations have been written using non-primitive parameters such as stream function and vorticity. Such approach allows a decrease in computational time due to a reduction of equation numbers. One of the main challenges in such a technique is a determining the stream function magnitude at the inner body walls. A solution of this problem has been described in detail in this paper. Computational scrutinizing has been performed by employing the finite difference technique. The mesh sensitivity analysis and comparison with theoretical and experimental results of other researchers have been included. An influence of the Rayleigh number, nanoparticles concentration, internal block size, heat conductivity ratio and non-dimensional time on nanofluid motion and energy transport has been studied.

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“…В уравнениях (2.1)-(2.6) использовались следующие параметры: X, Y -безразмерные декартовы координаты;  -безразмерное время;  -безразмерная температура;  -безразмерная функция тока; U, V -безразмерные составляющие вектора скорости в проекциях на оси X, Y, соответственно;  -безразмерная завихренность скорости; af -коэффициент температуропроводности среды, заполняющей полость [м 2 [14,15].…”

Section: рис 1 область исследованияunclassified

“…В результате было отмечено, что двумерные расчеты слабо сопоставимы с трехмерными, а данные квазидвумерного приближения качественно воспроизводят зависимость числа Нуссельта от толщины полости, но значения чисел Нуссельта меньше на 30%. В [2] проведено численное исследование влияния пористого слоя на естественную конвекцию наножидкости в открытой полости с горячей вертикальной стенкой. Авторы отмечают возможность интенсификации теплообмена с ростом концентрации наночастиц при условии близости пористого слоя и греющей стенки.…”

Section: Introductionunclassified

Numerical investigation of conjugate free convective heat transfer inside an enclosure with triangular heat generating source

Gibanov¹,

Sheremet²

2018

Вест. ПГУ. Физика

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Natural convection of alumina-water nanofluid in an open cavity having multiple porous layers

Cited by 85 publications

References 24 publications

Experimental investigation of convection heat transfer in the transition flow regime of aluminium oxide-water nanofluids in a rectangular channel

Experimental investigation of convection heat transfer in the transition flow regime of aluminium oxide-water nanofluids in a rectangular channel

Thermal Convection of Nanoliquid in a Double-Connected Chamber

Numerical investigation of conjugate free convective heat transfer inside an enclosure with triangular heat generating source

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