Local heat transfer performance and exit flow characteristics of a miniature axial fan

Stafford, Jason; Walsh, Edmond J.; Egan, Vanessa

doi:10.1016/j.ijheatfluidflow.2010.06.002

Cited by 17 publications

(13 citation statements)

References 15 publications

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“…Assumption that is made to reduce the complexity of flow field calculation [34] The flow field is at the steady state and the fluid is incompressible air. The turbulence model is the standard k-ε model with eddy rectification.…”

Section: Wall Boundary Conditionmentioning

confidence: 99%

Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Lin

Cheng²

2019

Symmetry

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In this study, different designs of the opening pattern of computer fan grills were investigated. The objective of this study was to propose a simulation analysis and compare it to the experimental results for a set of optimized fan designs. The FLUENT computational fluid dynamics (CFD) simulation software was used to analyze the fan blade flow. The experimental results obtained by the simulation analysis of the optimized fan designs were analyzed and compared. The effect of different opening pattern designs on the resulting airflow rate was investigated. Six types of fans with different grills were analyzed. The airflow velocity distribution in the simulated flow channel indicated that the wind speed efficiency of the fan and its influence were comparable with the experimental model. The air was forced by the fan into the air duct. The flow path was separately measured by analog instruments. The three-dimensional flow field was determined by performing a wind speed comparison on nine planes containing the mainstream velocity vector. Moreover, the three-dimensional curved surface flow field at the outlet position and the highest fan rotation speed were investigated. The air velocity distribution at the inlet and the outlet of the fan indicated that among the air outlet opening designs, the honeycomb shaped air outlet displayed the optimal performance by investigating the fan characteristics and the estimated wind speed efficiency. These optimized designs were the most ideal configurations to compare these results. The air flow rate was evenly distributed at the fan inlet.

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Section: Wall Boundary Conditionmentioning

confidence: 99%

Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Lin

Cheng²

2019

Symmetry

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“…Flow rate and pressure rise data was measured using standardised (BS848) facilities previously outlined by Stafford et al [4]. A hub-tip ratio of 0.66 produces the high pressure coefficient ( ) figure 1, with a sharp change in performance indicating the stalling point of the fan.…”

Section: Fan Performance and Heat Sink Designmentioning

confidence: 99%

“…A hub-tip ratio of 0.66 produces the high pressure coefficient ( ) figure 1, with a sharp change in performance indicating the stalling point of the fan. Swirl angle of the fan outlet flow was also measured to be 39.8 o for a nominal rotational speed ( ) ω of 9000 rpm [4]. These fan performance attributes were used as inputs to the numerical models which will be discussed in a proceeding section.…”

Section: Fan Performance and Heat Sink Designmentioning

confidence: 99%

“…An example of one such model is provided in figure 5. Despite operating at low Reynolds numbers ( 300 Re < d based on fan flow rates and annular slot width of fan flow area as characteristic length scale, d ) the flow regime was defined as turbulent based on the empirical information of Stafford et al [4] who demonstrated that heat transfer scaled towards a turbulent regime. An enhanced RNG two-equation turbulence model was selected based on empirical observations of the base plate surface temperature distribution in the current study.…”

Section: Numerical Modelsmentioning

confidence: 99%

“…Velocity field images of impingement on the flat surface highlighted the fluidic interactions between adjacent jets which caused reductions of ~ 15% in thermal performance compared to a single jet. As the flow from fans is swirling upon exit due to the centrifugal forces in the jet [4,5], examination of features observed for swirling impinging jets may also be comparable. Nuntadusit et al [6] compared conventional impinging jets with jets created by twisted-tape swirl generators.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance Characteristics of Integrated Cooling Solutions Consisting of Multiple Miniature Fans

Stafford

Fortune

Newport

2012

J. Phys.: Conf. Ser.

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Abstract. Thermal performance characteristics are assessed for multiple miniature axial fans of 24.6 mm diameter that provide impingement cooling on a finned surface. Combined experimental and numerical analyses indicate that fans positioned adjacently in an array can influence heat transfer performance both positively and negatively by up to 35% compared to an equivalent single fan -heat sink unit operating standalone. However the level of thermal performance reductions, coupled with greater geometrical flexibility, makes the design approach a viable alternative to current single fan -heat sink units. Experimental measurements also suggest that for a fixed spacing, fan operating point is a sensitive criterion for ensuring optimal thermal performance over an equivalent single fan unit. Numerical simulations, modelled using experimental inputs, have provided an insight into the flow fields produced by the interaction between adjacent fans and the finned geometry. Fluid recirculation occurs beneath the fan hub of the centrally located fan in the array, with the adjacent fans on the periphery experiencing cross flow in the hub region. A novel experimental approach utilising infrared thermography has been developed to assess the validity of the numerical model. Indeed, the previously stated flow features were confirmed using this assessment, while limitations in the modelling assumptions have been outlined. Overall, the results provide recommendations in the design of fan cooled heat sinks utilising multiple axial fans for jet impingement and an understanding of the flow physics which occur within this compact cooling solution design.

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Evaluating dynamic, fluid flow and performance parameters of piezoelectric based micro-blower: a two-dimensional axisymmetric numerical approach

Velmurugan,

Shrivastav,

Bharath

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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Local heat transfer performance and exit flow characteristics of a miniature axial fan

Cited by 17 publications

References 15 publications

Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Thermal Performance Characteristics of Integrated Cooling Solutions Consisting of Multiple Miniature Fans

Evaluating dynamic, fluid flow and performance parameters of piezoelectric based micro-blower: a two-dimensional axisymmetric numerical approach

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