Investigation of flow and heat transfer characteristics in micro pin fin heat sink with nanofluid (original) (raw)
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Study the micro pin fin and micro channel heat sinks with different types of cooling fluids
1st scientific conference in Alyen University, ISCAU2019., 2019
The micro pin fin heat sink (MPFHS) with three shapes (triangular, square and circular) of fins in addition to the microchannel heat sink(MCHS) are numerically investigated, with three types of pure fluids) Water, Oil, Ethylene Glycol), three types of Nanofluids (Al 2 O 3-water, Cu-water, TiO 2-water) and three types of microencapsulated phase change material suspensions (MEPCMS) (RT44-water, paraffin wax water, n-acted-water) .Constant heat flux(100 /) is applied on the base of the heat sink. The volumetric concentrations of Nanofluids and (MEPCMS) are (1%, 3%, and 5%) and (100 to 900) is the range of Reynolds number used in this paper. The results obtained show that using different types of Nanofluids and MEPCM suspensions lead to enhance the cooling performance of (MCHS) and (MPFCHS). The cooling performance in the (MCHS) is less than that for MPFHS. The heat transfer for all concentrations for MEPCMS is higher than that for Nanofluids. Additionally, the pressure drop for MEPCMS and Nanofluids increased for all concentrations. While the pressure drop for all concentrations in the (MCHS) is lower compared with that of (MPFHS).
Heat transfer of nanofluids in the mini-rectangular fin heat sinks
International Communications in Heat and Mass Transfer, 2013
In the present study, the heat transfer characteristics of nanofluids cooling in the mini-rectangular fin heat sink are studied. The heat sinks with three different channel heights are fabricated from the aluminum by the wire electrical discharge machine with the length, width and base thickness of 110, 60, and 2 mm, respectively. The nanofluids are the mixture of de-ionized water and nanoscale TiO 2 particles. The results obtained from the nanofluids cooling in mini-rectangular fin heat sink are compared with those from the de-ionized water cooling method. Effects of the inlet temperature of nanofluids, nanofluid Reynolds number, and heat flux on the heat transfer characteristics of mini-rectangular fin heat sink are considered. It is found that average heat transfer rates for nanofluids as coolant are higher than those for the de-ionized water as coolant. The results of this study are of technological importance for the efficient design of cooling systems of electronic devices to enhance cooling performance.
Experimental Thermal and Fluid Science, 2015
This study presents the experimental thermal and hydraulic performance of heat sink with miniature circular pin fin structure using two different types of nanofluid as coolant. ZnO and SiO 2 nanoparticles dispersed in DI water with particle volume fraction of 0.2, 0.4 and 0.6 vol.% are tested and compared with the data for water. A heat sink with inline arrangement of circular pins is designed and made from aluminum material. The height, diameter, pitch, and number of pins are 1.2, 1.2, 2.4 mm and 143, respectively. Uniform heat flux at the bottom of the heat sink is performed. The present work is conducted at fluid temperature of 15°C. The mass flow rate ranged from 0.65 to 3.32 kg/min and the heat flux ranged between 20 and 48 kW/m 2. The effects of particle type, particle concentration, and mass flow rate on the thermal and hydraulic performances are reported. The measured data show that the heat transfer performance of the nanofluid-cooled heat sink is higher than that of the water-cooled heat sink. Comparison between ZnO and SiO 2 nanofluids, higher heat transfer performance for ZnO-water nanofluids is observed by about 3-9%. For hydraulic performance, the results show that the addition of nanoparticles in the base fluid have a small effect on the pumping power. Finally, new heat transfer and pressure drop correlations are proposed to predict the Nusselt number and pressure drop of nanofluids flow in heat sinks with pin fin configuration.
Numerical Analysis of Micro Pin Fin Heat Sink Using Nano Fluids as Coolants
Foundation of Computer Applications, 2019
In this paper a fluid flow and thermal characteristics of micro pin fin heat sink is investigated with the computational fluid dynamics, by this with three fins geometries (square, triangular and circular) and Nano fluids is used as a cooling fluid, since the flow and heat transfer have been studied with two types of Nano fluids (Diamond-water and Alumina-water) in addition to the base fluid water. The results obtained indicated that, using of Nano fluids instead of water as a coolant leads to enhanced heat transfer performance Also performance of heat sink is good. Here for the analysis of heat sink, the model has been designed in the CATIA V5 software, and for the fluid flow and numerical analysis ANSYS FLUENT 16.2 software is used.
Heat and Mass Transfer, 2018
In this study, a comparison of the convective heat transfer, pressure drop, and performance index characteristics of heat sinks with a miniature circular pin-fin inline arrangement (MCFHS) and a zigzag flow channel with single cross-cut structures (CCZ-HS) is presented. SiO 2-water nanofluids with different particle concentrations are used as the coolant. The effects of the heat sink type, particle concentration and fluid flow rate on the thermal and hydraulic performances are evaluated. The testing conditions are performed at the wall heat fluxes of 10 to 60 kW/m 2 and at a mass flow rate ranging from 0.18 to 0.6 kg/s. The dimension of heat sinks is equally designed at 28 × 33 mm. The heat transfer area of MCFHS and of CCZ-HS is 1430 and 1238 mm 2 , respectively. Similarly, the hydraulic diameter of the flow channel of MCFHS and of CCZ-HS is 1.2 and 1.0 mm, respectively. The measured data indicate that the cooling performances of CCZ-HS are about 24-55% greater than that of MCFHS. The effects of the channel diameter and single cross-cut of the flow channel are more dominant than the effects of the fin structure and heat transfer area.
Numerical investigation of micro-pin-fin heat exchanger using nanofluids
Materials Today: Proceedings, 2019
Micro heat sinks find application in many areas such as electronic circuitry, aerospace, micro-reactors, etc. In micro heat sinks, Micro-Pin-Fin Heat Exchangers (MPFHE) are becoming popular due to their high heat transfer performance. In this study, Micro-Pin-Fin Heat Exchanger has been analyzed by considering the water, Al 2 O 3-water and CuO-water nanofluids as working fluids. A CFD model of MPFHE has been developed and analysed to predict the hydrodynamic and thermal behavior of the heat exchanger with these nanofluids as working fluids using ANSYS workbench. The hydrodynamic behavior such as pressure and temperature difference variation and thermal behavior such as heat transfer coefficients and heat transfer rates with respect to Reynolds number have been investigated. Similar behaviors have been investigated for different volume fractions 0.01, 0.02, 0.04 of nanofluids. Comparative work has been carried out between the working fluids and various volume fractions for above behaviour.
Study the micro heat sink with pin fins and different coolants: a comparative study
International Journal of Engineering & Technology, 2019
This research aims to study numerically the effect of different cooling fluids (pure fluids, Nanofluids, and Microencapsulated phase change materials suspensions) on the cooling performance of micro pin fin heat sink with different types of fins (square, triangular and circular). Three types of Nanofluids (Al2O3-water, Cu-water, TiO2-water), three types of microencapsulated phase change materials sus-pensions (MEPCMS) are (RT44-water, paraffin wax water, n-acted-water) and three pure fluids)Water, Oil, Ethylene Glycol) were used with constant heat flux (100 í µí± í µí±í µí± 2 ⁄) applied on the base of the heat sink. The volumetric concentrations of Nanofluids and MEPCM suspensions are (1%, 3%, and 5%) and (100 to 900) is the range of Reynolds number used in this study. A finite volume method (FVM) is used to find solutions of governor equations and boundary conditions. The results showed that using of different types of Nanofluids and MEPCM suspension lead to enhance the cooling performance of micro pin fin heat sink (MPFCHS) since it leads to increase the heat transfer 79.6% compared with pure fluids. The heat transfer in (MPFHS) for MEPCMS suspensions is higher than that for Nanofluids. However, the performance of heat sink increased with increases the concentration of Nanofluids and MEPCMS.
Powder Technology, 2019
This manuscript is aimed at investigating the thermohydraulic characteristics of 2 3 − /water hybrid nanofluid in a micro pin-fin heat sink by implementing a multiphase Lagrangian-Eulerian approach. In modelling the nanofluid the influence of slip mechanisms i.e. Saffman lift and drag force, Brownian motion, gravity, virtual mass, thermophoresis and pressure gradient-induced force is included. In addition, the fin efficiency of the nanofluid cooled sharp and streamlined fin configurations is probed by analysing diamond, circular and elliptical fins arranged in the staggered assembly. Spherical shaped hybrid nanoparticles of 15 nm are studied for the particle volume fraction of 1%. The performance of heat sinks is evaluated by analysing the quantitative parameters including log mean temperature difference, average () and surface () Nusselt number. Besides, the flow streamlines, thermal and vorticity contours represent the qualitative depiction of flow and thermal distributions. Results demonstrate that utilising nanofluid optimises enhancement to maximum values of 25.14%, 19.65% and
In this paper, the hydrodynamic and thermal performance of a miniature plate pin finned heat sink is investigated experimentally by utilizing two widely used nanofluids, Al2O3-water and TiO2-water. The heat sink base plate which is used in the cooling process of electronic devices, has the dimensions of 42 mm (L)×42 mm (W)×14 mm (H) and is made of Aluminum and placed in a plexiglass case which is isolated from the environment using an insulator foam. The thermal performance of the heat sink is investigated by passing the nanofluid at constant inlet temperature while applying a constant heat flux of 124.8 kW/m2 to the bottom surface of the heat sink. The nanofluids are prepared in volume concentrations of 0.5, 1, 1.5, and 2 percent and their performances are measured considering water as the base fluid. Measuring the pressure difference between the entrance and exit of the heat sink made it possible to study the hydrodynamic performance of the heat sink. Although the measurements showed 15% and 30% increase in the pumping power for the volume concentration of 2 % of Al2O3-water and TiO2-water nanofluids, respectively, the average heat transfer coefficients increased by 16% and 14% and the thermal resistance decreased by 17% and 14% for each nanofluid.