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Effects of using sinusoidal porous object(SPO)and perforated porous object(PPO)on the cooling performance of nano-enhanced multiple slot jet impingement for a conductive panel system

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Propulsion and Power Research 2024年第2期13卷 166-177页

作者： fatih selimefendigil Faiza Benabdallah Kaouther Ghachem Hind Albalawi Badr MAlshammari Lioua Kolsi Department of Mechanical Engineering College of EngineeringKing Faisal UniversityAl Ahsa 31982Saudi Arabia Department of Mechanical Engineering Celal Bayar UniversityManisa 45140Turkey Department of Industrial Engineering and Systems College of EngineeringPrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of Physics College of SciencesPrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of Electrical Engineering College of EngineeringUniversity of Ha’ilHa’il City 81451Saudi Arabia Department of Mechanical Engineering College of EngineeringUniversity of Ha’ilHa’il City 81451Saudi Arabia

Cooling system design for thermal management of electronic equipment,batteries and photovoltaic(PV)modules is important for increasing the efﬁciency,safety operation,and long life span the *** the present study,two different cooling systems are proposed with nano-enhanced multiple impinging jets for a conductive *** present cooling systems can be used in electronic cooling and PV *** porous object(PPO)and sinusoidal porous object(SPO)are used in the jet cooling system.2D numerical analysis usingﬁnite volume method is conducted considering different values of permeability of the objects(Darcy number(Da)between 10^(-6) and 10^(-1)).When PPO is used in the cooling system,num-ber of cylinders(between 1 and 6),and size of the cylinders(between 0.015 and 0.075)are *** the case of using SPO,amplitude(between 0.1 and 2)and wave number(be-tween 1 and 12)are ***-water nanoﬂuid with cylindrical shaped nanoparticles is used as the heat transferﬂ*** permeability is changed for PPO,the average temper-ature increases by roughly 3.89℃ for a single cylinder and drops by roughly 0.57℃ for a six-cylinder *** the size of the cylinder in the PPO case at highest permeability results in temperature drop of 5.3℃.When changing the number of cylinders,cooling rate varies by about 3.6%.Wave number of SPO is more inﬂuential on the cooling performance enhancement as compared to amplitude and permeability of the *** average surface temperature drops by 12.4℃ when the wave number is increased to *** compared to reference case of jet impingement cooling without porous object,using PPO and SPO along with the nanoﬂuid result in temperature drop of 12.3℃ and 14.4℃.

关键词： Thermal management Jet impingement Perforated porous

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Heat and mass transfer of a circular porous moist object located in a triangular shaped vented cavity

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Journal of Central South University 2024年第6期31卷 1956-1972页

作者： selimefendigil fatih OZCAN COBAN Seda OZTOP Hakan F Department of Mechanical Engineering College of EngineeringKing Faisal UniversityAl Ahsa 31982Saudi Arabia Department of Mechanical Engineering Manisa Celal Bayar UniversityManisa 45140Turkey Department of Mechanical Engineering Technology FacultyFırat UniversityElazığTurkey

Heat and mass transfer of a circular-shaped porous moist object inside a two-dimensional triangle cavity is investigated by using finite element *** porous object is considered to be a moist food sample,located in the middle of the cavity with inlet and outlet ports with different configurations of inlet/outlet *** drying performance is numerically assessed for different values of Reynolds numbers(between 50 and 250),dry air inlet temperature(between 40 and 80℃)and different locations of the *** is observed that changing the port locations has significant impacts on the flow recirculaitons inside the triangular chamber while convective drying performance is highly *** moisture content reduces with longer time and for higher Reynolds number(Re)*** P4 where inlet and outlet ports are in the middle of the walls provides the most effective configuration in terms of convective drying performance while the worst case is seen for P1 case where inlet and outlet are closer to the corners of the *** is a 192% difference between the moisture reduction of these two cases at Re=250,T=80℃ and t=120 min.

关键词： convective drying porous domain cavity flow inlet/exit port finite element method

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Mixed convection in a lid-driven cavity filled with single and multiple-walled carbon nanotubes nanofluid having an inner elliptic obstacle

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Propulsion and Power Research 2019年第2期8卷 128-137页

作者： fatih selimefendigil Mechanical Engineering Department Celal Bayar UniversityManisa 45140Turkey

In this study,numerical analysis and optimization in a single and multiple walled carbon nanotube-water nanofluid filled lid driven cavity having an inner elliptic obstacle were performed by using finite element method and COBYLA optimization *** top wall is moving with constant speed and vertical walls are kept at constant *** optimal size of the inner elliptic obstacle was determined by using an optimization study to maximize the average heat transfer along the hot wall of the *** simulation was performed by for various values of Richardson numbers(between 0.05 and 50)and various solid particle volume fraction(between 0 and 0.06)for single and multiple-walled carbon nanotubes water nanofluid.A larger obstacle(higher values of radii in the major and minor axis)with lower values of Richardson number results in higher heat transfer *** average Nusselt number versus solid particle volume fraction shows a linear trend and the discrepancy between the average Nusselt number for the cavity with the optimized obstacle and other obstacles becomes higher with higher particle volume *** average heat transfer enhances significantly which is about 120.20%for single wall carbon nanotube-water nanofluid at solid volume fraction of 0.06 when compared to pure *** discrepancy between the average Nusselt number for single and multiple walled carbon nanotubes becomes higher for higher values of Richardson number and solid particle volume fraction.A polynomial type correlation was proposed for the average Nusselt number along the hot wall which is fifth order for Richardson number an first order for nanoparticle volume fraction.

关键词： Lid-driven cavity Carbon nanotubes Optimization Finite element method

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Thermal management of nanoliquid forced convective flow over heated blocks in channel by using double elliptic porous objects

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Propulsion and Power Research 2021年第3期10卷 262-276页

作者： fatih selimefendigil Hakan FÖztop Department of Mechanical Engineering Manisa Celal Bayar UniversityManisa45410Turkey Department of Mechanical Engineering Technology FacultyFõrat University23119Turkey

Effects of using nanoliquid and double porous elliptic objects on the flow separation and convective heat transfer control for flow over multiple heated blocks in channel are numerically investigated by using finite element ***,brick,blade and cylindrical shaped alumina particles are used in water up to solid volume fraction of 2%.Impacts of Reynolds number(50≤Re≤500),permeability of the porous ellipses(10^(-5)≤D_(a1)≤5×10^(-2) and 10^(-5)≤D_(a2)≤5×10^(-2)),aspect ratio of the ellipses(0.25≤AR_(1)≤1.5,0.25≤AR_(2)≤1.5),distance between the ellipses(0.2H≤sx≤1.6H)and distance of the first ellipse from inlet(-H≤mx≤H)on the hydro-thermal performance are *** highest performance improvement is obtained by using the cylindrical shaped particles in the base heat transfer fluid at the highest solid volume fraction and the amount of heat transfer enhancement are 33%and 40.5%for hot blocks while negligible pressure drop is *** the aspect ratio of the ellipses in the perpendicular direction to the flow,up to 25%and 30%heat transfer increment are obtained for hot block with slight rise of pressure ***,when varying the horizontal location of the porous ellipses in the channel and permeability of them,there is considerable rise of pressure *** of the average heat transfer from the hot blocks with varying permeability of the ellipses are obtained as 32%and 25%.Successful hydro-thermal performance estimation results are achieved by using artificial neural networks with feed-forward network architecture of 1 hidden layer and 17 neurons.

关键词： Thermal management Porous ellipses Finite element method Hydro-thermal performance Nanoliquid Nanoparticle shape

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Electrical conductivity effect on MHD mixed convection of nanofluid flow over a backward-facing step

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Journal of Central South University 2019年第5期26卷 1133-1145页

作者： selimefendigil fatih OCAN CBAN Seda OTOP Hakan F. Department of Mechanical Engineering Celal Bayar University45140 ManisaTurkey Department of Mechanical Engineering Technology FacultyFirat University23119 ElazigTurkey

In this study,magneto-hydrodynamics (MHD) mixed convection effects of Al2O3-water nanofluid flow over a backward-facing step were investigated numerically for various electrical conductivity models of nanofluids.A uniform external magnetic field was applied to the flow and strength of magnetic field was varied with different values of dimensionless parameter Hartmann number (Ha=0,10,20,30,40).Three different electrical conductivity models were used to see the effects of MHD nanofluid ***,five different inclination angles between 0°-90° is used for the external magnetic *** problem geometry is a backward-facing step which is used in many engineering applications where flow separation and reattachment phenomenon *** type convective heat transfer of backward-facing step was examined with various values of Richardson number (Ri=0.01,0.1,1,10) and four different nanoparticle volume fractions (Ф=0.01,0.015,0.020,0.025) considering different electrical conductivity *** element method via commercial code COMSOL was used for *** indicate that the addition of nanoparticles enhanced heat transfer *** increasing magnetic field strength and inclination angle increased heat transfer *** of different electrical conductivity models were also investigated and it was observed that they have significant effects on the fluid flow and heat transfer characteristics in the presence of magnetic field.

关键词： electrical conductivity nanofluids backward-facing step MHD flow mixed convection

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