An experimental study of the unsteady thermal flow around a thin fin on a sidewall of a differentially heated cavity

Xu, Feng; Patterson, John C.; Lei, Chengwang

doi:10.1016/j.ijheatfluidflow.2008.01.001

Cited by 51 publications

(23 citation statements)

References 44 publications

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“…In fact, the development of natural convection flows in the cavity following sudden heating and cooling is considerably changed by the fin on the sidewall. The experiments show that a thermal flow ejected from the thermal boundary layer upstream of the fin horizontally travels under the fin, then ascends bypassing the fin, and finally reattaches the thermal boundary layer downstream of the fin [40]. Such a thermal flow in the early time following sudden heating significantly enhances heat transfer through the sidewall up to 23% [38].…”

Section: Introductionmentioning

confidence: 94%

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Dynamic and heat transfer of a Pr < 1 thermal flow around a fin on the thermal wall

2017

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 94%

“…Based on previous experiments (the cavity aspect ratio A = 0.24) and numerical simulations [38,40], we consider a two dimensional cavity, as shown in Fig. 6.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Dynamic and heat transfer of a Pr < 1 thermal flow around a fin on the thermal wall

2017

International Journal of Heat and Mass Transfer

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“…Numerous studies have investigated the impact of fins in enclosures with a temperature gradient between the vertical walls along with the insulated top and bottom surfaces. Examples include: a single fin on the hot wall [15][16][17][18], a single fin on the insulated top wall [19], a single fin attached to either vertical (hot) or bottom (insulated) wall [20]. In contrast to these studies with laterally heated cavities, however, the research on augmentation or suppression of heat transfer in RB convection through fins is relatively limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fin Orientation and Length on the Rayleigh-Benard Convection

Selamet¹,

Selamet²,

Dehner³

2017

JEPE

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Natural convection driven by the temperature difference of horizontal top and bottom surfaces of an enclosure containing air, Pr = 0.7, and fins of different arrangements at different lengths is studied numerically for Ra = 10 5 and 5 × 10 5 . Evolution of heat transfer rates (Nusselt number) is illustrated along with various, steady or unsteady, cellular flow structures and temperature patterns. The effect of fin length and placement on flow regime and heat transfer is established. Different fin orientations at the walls are observed to introduce considerable unsteadiness in some cases, requiring close investigation in order to design systems for specific purposes.

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“…Xu et al made their efforts to investigate the physical mechanical of natural convection by imposing a thin fin on the hot side of the differentially heated cavity [11][12][13][14][15]. In the following description, we will briefly review the investigation progress and the relevant conclusions.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow instability and heat transfer of natural convection in a differentially heated cavity

Dou

Jiang

2016

International Journal of Heat and Mass Transfer

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This paper numerically investigates the physical mechanism of flow instability and heat transfer of natural convection in a cavity with thin fin(s). The left and the right walls of the cavity are differentially heated. The cavity is given an initial temperature, and the thin fin(s) is fixed on the hot wall in order to control the heat transfer. The finite volume method and the SIMPLE algorithm are used to simulate the flow. Distributions of the temperature, the pressure, the velocity and the total pressure are obtained. Then, the energy gradient theory is employed to study the physical mechanism of flow instability and the effect of the thin fin(s) on heat transfer. Based on the energy gradient theory, the energy gradient function K represents the characteristic of flow instability. It is observed from the simulation results that the positions where instabilities take place in the temperature contours accord well with those of higher K value, which demonstrates that the energy gradient theory reveals the physical mechanism of flow instability. Furthermore, the effects of the fin length, the fin position, the fin number, and Ra on heat transfer are investigated. It is found that the effect of the fin length on heat transfer is negligible when Ra is relatively high. When there is only one fin, the most efficient heat transfer rate is achieved as the fin is fixed at the middle height of the cavity. The fin blocks heat transfer with a relatively small Ra, but the fin enhances heat transfer with a relatively large Ra. The fin(s) enhances heat transfer gradually with the increase of Ra under the influence of the thin fin(s). Finally, a linear correlation of Kmax with Ra is obtained which reveals the physical mechanism of natural convection from different approaches. Thin fin(s) K h T temperature of the hot wall K u, v velocity components in x, y directions respectively m s -1  m v amplitude of the disturbance of velocity in transverse direction m s -1 x, y coordinates m Greek symbols  coefficient of thermal expansion (10 -6 )K -1  thermal conductivity W m -1 K -1  dynamic viscosity Nm -2 s  kinematic viscosity m² s -1 3  density of fluid kg m -3 d  frequency of the disturbance rad s -1 E  energy difference along transverse direction J m -3 H  energy difference along streamwise direction J m -3 T  temperature difference K x  grid mesh sizes m

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An experimental study of the unsteady thermal flow around a thin fin on a sidewall of a differentially heated cavity

Cited by 51 publications

References 44 publications

Dynamic and heat transfer of a Pr < 1 thermal flow around a fin on the thermal wall

Dynamic and heat transfer of a Pr < 1 thermal flow around a fin on the thermal wall

Effect of Fin Orientation and Length on the Rayleigh-Benard Convection

Numerical simulation of flow instability and heat transfer of natural convection in a differentially heated cavity

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