scholarly journals Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

2021 ◽  
Author(s):  
Christopher Welsford
Keyword(s):  
Thermal Effects ◽  
Aluminum Foam ◽  
Numerical Study ◽  
Maximum Error ◽  
Heat Sinks ◽  
Pumping Power ◽  
Effective Combination ◽  
Foam Metal ◽  
Cooling Of Electronics ◽  
Good Agreement

The present study determines the effects which foam metals and Nanofluid have on the performance of a simulated CPU. The present study employs yAl2O3-water Nanofluid and 6061- T6 Aluminum foam metal with a porosity of 0.91 and permeability of 40 pores per linear inch formed in bulk media and porously filled channels. The concentrations evaluated are 0.1%, 0.3%, and 0.6% by volume. The study shall consider both original empirical results and numerical results obtained from COMSOL Multiphysics, showing good agreement with a maximum error of 4.3%. The present study. When considering the average Nusselt number as the representation of the strength of the heat transfer mechanism, and as such ignoring pumping requirements, it is shown that the use of porously filled channels interacting with 0.6% Nanofluid produces the most effective combination. However, when pumping power is relevant, a combination of bulk porous media interacting with 0.3% Nanofluid is observed. The results obtained herein can be applied to the cooling of electronics, or any other system wherein a general inward heat flux is applied.

scholarly journals Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

2021 ◽  
Author(s):  
Christopher Welsford
Keyword(s):  
Thermal Effects ◽  
Aluminum Foam ◽  
Numerical Study ◽  
Maximum Error ◽  
Heat Sinks ◽  
Pumping Power ◽  
Effective Combination ◽  
Foam Metal ◽  
Cooling Of Electronics ◽  
Good Agreement

The present study determines the effects which foam metals and Nanofluid have on the performance of a simulated CPU. The present study employs yAl2O3-water Nanofluid and 6061- T6 Aluminum foam metal with a porosity of 0.91 and permeability of 40 pores per linear inch formed in bulk media and porously filled channels. The concentrations evaluated are 0.1%, 0.3%, and 0.6% by volume. The study shall consider both original empirical results and numerical results obtained from COMSOL Multiphysics, showing good agreement with a maximum error of 4.3%. The present study. When considering the average Nusselt number as the representation of the strength of the heat transfer mechanism, and as such ignoring pumping requirements, it is shown that the use of porously filled channels interacting with 0.6% Nanofluid produces the most effective combination. However, when pumping power is relevant, a combination of bulk porous media interacting with 0.3% Nanofluid is observed. The results obtained herein can be applied to the cooling of electronics, or any other system wherein a general inward heat flux is applied.

scholarly journals Numerical Study of Double-Layered Microchannel Heat Sinks with Different Cross-Sectional Shapes

Entropy ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 16 ◽  
Author(s):  
Daxiang Deng ◽  
Guang Pi ◽  
Weixun Zhang ◽  
Peng Wang ◽  
Ting Fu
Keyword(s):  
Pressure Drop ◽  
Thermal Resistance ◽  
Thermal Performance ◽  
Numerical Study ◽  
Heat Sinks ◽  
High Heat Flux ◽  
Pumping Power ◽  
Cross Sectional ◽  
Prime Concern ◽  
Microchannel Heat Sinks

This work numerically studies the thermal and hydraulic performance of double-layered microchannel heat sinks (DL-MCHS) for their application in the cooling of high heat flux microelectronic devices. The superiority of double-layered microchannel heat sinks was assessed by a comparison with a single-layered microchannel heat sink (SL-MCHS) with the same triangular microchannels. Five DL-MCHSs with different cross-sectional shapes—triangular, rectangular, trapezoidal, circular and reentrant Ω-shaped—were explored and compared. The results showed that DL-MCHS decreased wall temperatures and thermal resistance considerably, induced much more uniform wall temperature distribution, and reduced the pressure drop and pumping power in comparison with SL-MCHS. The DL-MCHS with trapezoidal microchannels performed the worst with regard to thermal resistance, pressure drop, and pumping power. The DL-MCHS with rectangular microchannels produced the best overall thermal performance and seemed to be the optimum when thermal performance was the prime concern. Nevertheless, the DL-MCHS with reentrant Ω-shaped microchannels should be selected when pumping power consumption was the most important consideration.

ANALYTICAL AND NUMERICAL STUDY OF RADIATION IN HEAT SINKS OF RECTANGULAR FINS

2019 ◽  
Author(s):  
Felipe Henrique Rafael ◽  
Vilson Silva ◽  
Bruno de Campos Salles Anselmo ◽  
Sandro Metrevelle Marcondes de Lima e Silva
Keyword(s):  
Numerical Study ◽  
Heat Sinks

Performance of rectangular labyrinth weir- an experimental and numerical study

2022 ◽  
Author(s):  
Mosbah Ben Said ◽  
Ahmed Ouamane
Keyword(s):  
Discharge Capacity ◽  
Numerical Study ◽  
Flow Behavior ◽  
Rectangular Channel ◽  
Experimental Models ◽  
Absolute Relative Error ◽  
Labyrinth Weir ◽  
Specific Discharge ◽  
Labyrinth Weirs ◽  
Good Agreement

Abstract Labyrinth weirs are commonly used to increase the capacity of existing spillways and provide more efficient spillways for new dams due to their high specific discharge capacity compared to the linear weir. In the present study, experimental and numerical investigation was conducted to improve the rectangular labyrinth weir performance. In this context, four configurations were tested to evaluate the influence of the entrance shape and alveoli width on its discharge capacity. The experimental models, three models of rectangular labyrinth weir with rounded entrance and one with flat entrance, were tested in rectangular channel conditions for inlet width to outlet width ratios (a/b) equal to 0.67, 1 and 1.5. The results indicate that the rounded entrance increases the weir efficiency by up to 5%. A ratio a/b equal to 1.5 leads to an 8 and 18% increase in the discharge capacity compared to a/b ratio equal to 1 and 0.67, respectively. In addition, a numerical simulation was conducted using the opensource CFD OpenFOAM to analyze and provide more information about the flow behavior over the tested models. A comparison between the experimental and numerical discharge coefficient was performed and good agreement was found (Mean Absolute Relative Error of 4–6%).

Experimental, numerical and parametric studies on stress concentration factors of T-joints under tension

2021 ◽  
pp. 136943322110499
Author(s):  
Feleb Matti ◽  
Fidelis Mashiri
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Numerical Study ◽  
Hot Spot ◽  
Joint Models ◽  
Element Analysis ◽  
T Joints ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Good Agreement

This paper investigates the behaviour of square hollow section (SHS) T-joints under static axial tension for the determination of stress concentration factors (SCFs) at the hot spot locations. Five empty and corresponding concrete-filled SHS-SHS T-joint connections were tested experimentally and numerically. The experimental investigation was carried out by attaching strain gauges onto the SHS-SHS T-joint specimens. The numerical study was then conducted by developing three-dimensional finite element (FE) T-joint models using ABAQUS finite element analysis software for capturing the distribution of the SCFs at the hot spot locations. The results showed that there is a good agreement between the experimental and numerical SCFs. A series of formulae for the prediction of SCF in concrete-filled SHS T-joints under tension were proposed, and good agreement was achieved between the maximum SCFs in SHS T-joints calculated from FE T-joint models and those from the predicted formulae.

Pin-Fin Heat Sink With Horizontal Base and Blocked Edges

2008 ◽  
Author(s):  
D. Sahray ◽  
H. Shmueli ◽  
N. Segal ◽  
G. Ziskind ◽  
R. Letan
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Contact Resistance ◽  
Cross Section ◽  
Heat Input ◽  
Heat Sink ◽  
Numerical Study ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Pin Fin

In the present work, horizontal-base pin fin heat sinks exposed to free convection in air are studied. They are made of aluminum, and there is no contact resistance between the base and the fins. For the same base dimensions the fin height and pitch vary. The fins have a constant square cross-section. The edges of the sink are blocked: the surrounding insulation is flush with the fin tips. The effect of fin height and pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks and their environment are modeled using the Fluent 6 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed for various fin heights. Also assessed are effects of the blocked edges as compared to the previously studied cases where the sink edges were exposed to the surroundings.

Thermal Management of Surface Mount Power Magnetic Components

1999 ◽  
Vol 122 (4) ◽  
pp. 323-327
Author(s):  
G. Refai-Ahmed ◽  
M. M. Yovanovich
Keyword(s):  
Heat Transfer ◽  
Power Loss ◽  
Numerical Study ◽  
Lower Surface ◽  
Experimental Results ◽  
Surface Mount ◽  
Conduction Heat Transfer ◽  
Magnetic Components ◽  
Underfill Material ◽  
Good Agreement

A numerical and experimental study of conduction heat transfer from low power magnetic components with gull wing leads was conducted to determine the effects of distributing the power loss between the core, the winding and the thermal underfill on the thermal resistance. The numerical study was conducted in the power loss ratio range of 0.5⩽PR⩽1.0, where the only active power loss was from the winding at PR=1. In addition, the effect of the thermal underfill material between the substrate and the lower surface of the magnetic package on the thermal performance of the magnetic device was also examined. For comparison, a test was conducted on a magnetic component at PR=1, without thermal underfill. This comparison revealed good agreement between the numerical and experimental results. Finally, a general model was proposed for conduction heat transfer from the surface mount power magnetic packages. The agreement between the model and the experimental results was within 8 percent. [S1043-7398(00)00704-0]

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