Experimental study of unsteady thermal characteristics and rotation induced stabilization of air convection in a bottom heated rotating vertical cylinder

Ker, Y.T.; Li, Y.H.; Lin, T.F.

doi:10.1016/s0017-9310(97)00258-5

Cited by 9 publications

(1 citation statement)

References 31 publications

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“…Recently, Ker et al (8) experimentally investigated flow stabilization by cavity rotation in convection of air in a vertical circular cylinder heated from below. The experimental data clearly illustrate the stabilization of the thermal buoyancy driven irregular flow by the cavity rotation when the rotation rate is within a certain range.…”

Section: Introductionmentioning

confidence: 99%

Thermal Behaviors and Lubrication Properties in Rotary Blade Coupling of Sports Utility Vehicles

Huang

Tzeng

Ma³

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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This study attempts to improve the local high temperature distributions in rotary-bladecoupling (RBC), which is the source of motive power for sport-utility-vehicles (SUV). The experiment takes RBC with forced convection and circumferential ribs for the research on heat transfer enhancement. During rotation, RBC produces centrifugal fluid flow, convection phenomenon and temperature distributions that differ with rotational speed. Simultaneously, rotation enhances the turbulence intensity of the flow field, promoting heat transfer and destabilizing Taylor vortices. This instability influences the local heat transfer distribution and damages the machine parts because of overheating. To analyze the actual convection of the rotary flow field, the experiment testing section is designed based on the actual size of the RBC. In the experiment, the RBC is cooled via forced exterior oil supply, and ring-shaped turbulence ribs of three aspect ratios (AR = 5/3, 2.5, and 10/3) are added to augment the heat transfer area, for discussing the axial temperature distributions at the top and bottom of the RBC. The experiment adopts major physical parameters within 2.856×10 5 ≤ Ta ≤ 2.031×10 6 and 0.053 ≤ Re ≤ 1.054 to discuss the heat transfer effect in the interior rotary flow distribution groove of RBC in the four-wheel-drive (4WD) vehicle. Finally, based on the relevant experimental results, an empirical correlation is established for the reference of 4WD vehicle designers.

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Section: Introductionmentioning

confidence: 99%

Thermal Behaviors and Lubrication Properties in Rotary Blade Coupling of Sports Utility Vehicles

Huang

Tzeng

Ma³

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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Heat Transfer by Mixed Convection

Free-Convective Heat Transfer

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Calculations of heat transfer from high-temperature surfaces lead to the necessity of simultaneous allowance for the effects of different heat transfer mechanisms on the heat exchange characteristics. The role of radiative-convective heat transfer, when radiative, convective and conductive heat exchange occur simultaneously, is especially large. The complex heat transfer processes occur in this case in emission, absorption, and scattering of radiation by a liquid. However, under certain conditions the air is devoid of the indicated properties, and the effect of radiation should be taken into account only in the heat balance on the wall. If the wall has a constant temperature, the heat transfer for a nonabsorbing ambient is determined separately for radiating and convective components [7.1-7.3].During simultaneous action of free and forced convection, the Reynolds number Re and the criteria describing the geometry of the boundaries and the flow orientation relative to the gravitational field are also essential in addition to Pr and Gr numbers. Depending on the correlation between viscous, buoyant, and inertial forces it is possible to distinguish different liquid movement regimes and heat transfer conditions. For the large Gr and small Re numbers the effect of forced convection on heat transfer can be neglected. For the total action of free and forced convection the largest practical interest represents a laminar regime. The viscous regime corresponds to natural convection with a disturbing effect of forced motion, and, conversely, for turbulent motion the free convection has a little effect on motion and is a small value in the total thermal balance [7.4]. Effect of Radiation on Free-Convective Heat TransferThe heat flux q w generated by a wall is transferred away by the radiating component q r dependent on local temperature, and by the convective-conductive one q t . The wall is a gray diffusive radiator with the emissivity ε, and for the radiative component we can use the Stefan-Boltzmann law:

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On the influence of rotation on thermal convection in a rotating cavity for solar receiver applications

Wu¹,

Amsbeck²,

Buck³

et al. 2014

Applied Thermal Engineering

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Experimental study of unsteady thermal characteristics and rotation induced stabilization of air convection in a bottom heated rotating vertical cylinder

Cited by 9 publications

References 31 publications

Thermal Behaviors and Lubrication Properties in Rotary Blade Coupling of Sports Utility Vehicles

Thermal Behaviors and Lubrication Properties in Rotary Blade Coupling of Sports Utility Vehicles

Heat Transfer by Mixed Convection

On the influence of rotation on thermal convection in a rotating cavity for solar receiver applications

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