Convective heat transfer enhancement in a parallel plate channel by means of rotating or oscillating blade in the angular direction

Pourgholam, Mina; Izadpanah, Ehsan; Motamedi, Rasoul; Habibi, S.E.

doi:10.1016/j.applthermaleng.2014.12.057

Cited by 23 publications

(9 citation statements)

References 13 publications

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“…Most of the experts studied the effect of rotational cylinder on the heat transfer, supposing that the cylinder has the circular surface. However, the triangular [15] elliptical [16] and rectangular [17] surfaces were of interest too.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect a Rotational Shaft on the Thermal Behavior of a Circular Tube under Constant Heat Flux

Rahimi

Jafarmadar

Mirzaie

2021

IJE

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Active and passive methods are two main mechanisms of heat transfer improvement. The active methods use external forces to improve heat transfer. This investigation evaluates the thermal and frictional behavior of a circular tube containing a rotational shaft. Constant heat flux was exerted to the circular tube. The fluid inlet and outlet temperature as well as wall temperature of tubes were measured to calculate the hat transfer coefficient. The Re (Reynolds) number was between 800-2000. Also, the dimensionless rotational speed (Rs) had the values of 1,1.5, 2, 2.5 and 3. Results revealed that the rotational shaft could increase the Nu number. Up to %18. Also, the results showed that the rotational shaft could significantly increase the pressure drop and friction factor. The maximum increment of %78 was achieved for friction factor. It was revealed that the use of rotational shaft could be more efficient at low Re numbers and low dimensionless rotational speeds. Also, it was found that by the increment of Reynolds number and being in the transient regime the efficiency of the system would improve.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect a Rotational Shaft on the Thermal Behavior of a Circular Tube under Constant Heat Flux

Rahimi

Jafarmadar

Mirzaie

2021

IJE

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“…Numerous studies have been carried out in many fields on maxima or minima of time-averaged quantities [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. They include the optimization of temperatures [1-3], heating rate [4], beam to wave power transfer efficiency [5], current density [6], reaction rate [7], flow vorticity [8] and velocity [9,10], drag reductions [11,12], heat transfer rates [13][14][15][16][17], shear stresses [18][19][20] and so on. However, most of them are parametric optimization, useful in cases where the number of optimization variables is small.…”

Section: Introductionmentioning

confidence: 99%

Global, Non-Parametric, Non-Iterative Optimization of Time-Averaged Quantities under Small, Time-Varying Forcing: An Application to a Thermal Convection Field

Ishida¹,

Ihara²,

Okema³

et al. 2018

Preprint

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This study demonstrates a global, non-parametric, non-iterative optimization of time-mean value of a kind of index vibrated by time-varying forcing. It is based on the fact that the (steady) forced vibration of non-autonomous ordinary differential equation systems is well approximated by an analytical solution when the amplitude of forcing is sufficiently small and its base state without forcing is stable and steady. It is applied to optimize a time-averaged heat-transfer rate on a two-dimensional thermal convection field in a square cavity with horizontal temperature difference, and the globally optimal way of vibrational forcing, i.e. the globally optimal, spatial distribution of vibrational heat and vorticity sources, is first obtained. The maximized vibrational thermal convection corresponds well to the state of internal gravity wave resonance. In contrast, the minimized thermal convection is weak, keeping the boundary layers on both sidewalls thick.

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“…Two categories of FSI exist, and the driving force of structural vibration distinguishes them, an active one with external power and a passive one without external power requirement. Active FSI vortex generators have been employed to enhance heat transfer in various applications [32][33][34][35]. These can be applied to current heat exchangers where their oscillating frequencies directly affect the thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Air Side Heat Transfer Enhancement with Self Agitators

Chen

2017

47th AIAA Fluid Dynamics Conference

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Convective heat transfer enhancement in a parallel plate channel by means of rotating or oscillating blade in the angular direction

Cited by 23 publications

References 13 publications

Experimental Investigation on the Effect a Rotational Shaft on the Thermal Behavior of a Circular Tube under Constant Heat Flux

Experimental Investigation on the Effect a Rotational Shaft on the Thermal Behavior of a Circular Tube under Constant Heat Flux

Global, Non-Parametric, Non-Iterative Optimization of Time-Averaged Quantities under Small, Time-Varying Forcing: An Application to a Thermal Convection Field

Air Side Heat Transfer Enhancement with Self Agitators

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