Natural convection in a vertically divided square enclosure by a solid partition into air and water regions

Öztop, Hakan F.; Varol, Yasin; Koca, Ahmet

doi:10.1016/j.ijheatmasstransfer.2009.07.016

Cited by 59 publications

(22 citation statements)

References 27 publications

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“…Moreover, the natural convection in buildings and the insulation of heat storage systems can be simulated by cavities divided by impermeable dividers [11][12][13], which has extensively studied. Different characteristics of free convection heat transfer were studied to improve or control the heat transfer process in homogeneous cavities [14], [15]; and in partitioned cavities such as a diagonally-divided square cavity [16]; a cavity with an offcenter partition [17]; a cavity with multiple vertical partitions [18]; a vertically-divided cavity [19]; and divided cavities with various thermal boundary conditions [19]; a partitioned cavity subject to a uniform heat flux [20] and partitioned cavities with various thermal boundary conditions [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Fluid–structure interaction of free convection in a square cavity divided by a flexible membrane and subjected to sinusoidal temperature heating

Ghalambaz

Mehryan

Ismael

et al. 2019

HFF

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Purpose The purpose of the present paper is to model a cavity, which is equally divided vertically by a thin, flexible membrane. The membranes are inevitable components of many engineering devices such as distillation systems and fuel cells. In the present study, a cavity which is equally divided vertically by a thin, flexible membrane is model using the fluid–structure interaction (FSI) associated with a moving grid approach. Design/methodology/approach The cavity is differentially heated by a sinusoidal time-varying temperature on the left vertical wall, while the right vertical wall is cooled isothermally. There is no thermal diffusion from the upper and lower boundaries. The finite-element Galerkin technique with the aid of an arbitrary Lagrangian–Eulerian procedure is followed in the numerical procedure. The governing equations are transformed into non-dimensional forms to generalize the solution. Findings The effects of four pertinent parameters are investigated, i.e., Rayleigh number (104 = Ra = 107), elasticity modulus (5 × 1012 = ET = 1016), Prandtl number (0.7 = Pr = 200) and temperature oscillation frequency (2p = f = 240p). The outcomes show that the temperature frequency does not induce a notable effect on the mean values of the Nusselt number and the deformation of the flexible membrane. The convective heat transfer and the stretching of the thin, flexible membrane become higher with a fluid of a higher Prandtl number or with a partition of a lower elasticity modulus. Originality/value The authors believe that the modeling of natural convection and heat transfer in a cavity with the deformable membrane and oscillating wall heating is a new subject and the results have not been published elsewhere.

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Section: Introductionmentioning

confidence: 99%

Fluid–structure interaction of free convection in a square cavity divided by a flexible membrane and subjected to sinusoidal temperature heating

Ghalambaz

Mehryan

Ismael

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

“…[6] reported the average Nusselt number increases with decreasing of thermal resistance of the partition and the partition thickness has little effect on heat transfer. [7] studied a vertically divided square enclosure by a solid partition into air and water regions and found that filling of fluid into chests is important for obtaining maximum heat transfer and energy saving. [8] addressed on the optimization of heat transfer rate by varying the partitions location, partitions size and thermal conductivity ratio.…”

Section: Introductionmentioning

confidence: 99%

Conductive-convective heat transfer in an inclined enclosure with vertical partition

Jelita¹,

Taslim²

2018

astp

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Conductive-convective heat transfer in a square enclosure are studied numerically in the present article. The hot and cold walls are making an angle with horizontal direction. The Galerkin weighted residual finite element method has been used to solve the governing partial differential equations. In numerical simulations, the partition thickness, the orientation angle and the Rayleigh number are considered. It is found that the flow circulation decreases with decreasing the orientation angle and the maximum heat transfer rate is obtained near ϕ = 60 • for the considered partition thickness.

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“…In one of these methods, partitions are used within the cavity or on the walls of the cavity to affect the fluid motion and heat transfer characteristics [1][2][3][4][5]. In heat transfer applications, nano-size metallic/nonmetallic particles are added to the base fluids such as water or ethylene glycol to enhance the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Köşe Bölmeli Kare Muhafazada Nanopartikül Şekil Etkisinin Doğal Konveksiyon Üzerine Etkileri

Selimefendigil¹,

Inada²

2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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In this study, numerical investigation of natural convection in a corner partitioned square cavity filled with nanoparticles of different shapes was performed by using finite element method. The left and right vertical walls of the cavity are kept at constant temperatures while the horizontal walls are adiabatic and the corner partition is conductive. The numerical study was performed for various values of Rayleigh numbers, solid nanoparticle volume fractions, radii of the corner partition and different nanoparticle shapes. It was observed that average heat transfer enhances as the value of the Rayleigh number, nanoparticle volume fraction and size of the conductive partition increases. Cylindrical shape nanoparticles show the best performance and spherical ones show the worst performance in terms of heat transfer enhancement.Keywords: Conjugate natural convection, Nanofluids, Corner partition, Finite element method Köşe Bölmeli Kare Muhafazada Nanopartikül Şekil Etkisinin Doğal Konveksiyon Üzerine Etkileri ÖzBu çalışmada, farklı şekillerde nanopartiküller ile doldurulmuş köşe bölmeli kare boşlukta doğal konveksiyonun sayısal incelenmesi sonlu elemanlar yöntemi kullanılarak gerçekleştirilmiştir. Boşluğun sol ve sağ dikey duvarları sabit sıcaklıkta tutulurken, yatay duvarlar adyabatik ve köşe bölmesi iletkentir. Sayısal çalışma farklı nanopartikül şekilleri ve köşe bölmesinin yarıçapı, katı nanopartikül hacim kesirleri, Rayleigh sayılarının çeşitli değerleri için uygulanmıştır. Rayleigh sayısının, nanopartikül hacim kesrinin ve iletken bölmenin boyutunun artması, ortalama ısı transferini arttırdığı gözlemlenmiştir. Silindir şeklindeki nanopartiküller en iyi performansı gösterirken, küresel olanlar da ısı transferinin iyileştirilmesi açısından en kötü performansı göstermektedir.

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Natural convection in a vertically divided square enclosure by a solid partition into air and water regions

Cited by 59 publications

References 27 publications

Fluid–structure interaction of free convection in a square cavity divided by a flexible membrane and subjected to sinusoidal temperature heating

Fluid–structure interaction of free convection in a square cavity divided by a flexible membrane and subjected to sinusoidal temperature heating

Conductive-convective heat transfer in an inclined enclosure with vertical partition

Köşe Bölmeli Kare Muhafazada Nanopartikül Şekil Etkisinin Doğal Konveksiyon Üzerine Etkileri

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