scholarly journals Simulation of Nanofluid Flow in a Micro-Heat Sink With Corrugated Walls Considering the Effect of Nanoparticle Diameter on Heat Sink Efficiency

2021 ◽  
Vol 9 ◽  
Author(s):  
Yacine Khetib ◽  
Hala M. Abo-Dief ◽  
Abdullah K. Alanazi ◽  
Goshtasp Cheraghian ◽  
S. Mohammad Sajadi ◽  
...  
Keyword(s):  
Heat Sink ◽  
Figure Of Merit ◽  
Reynolds Numbers ◽  
Constant Heat Flux ◽  
Maximum Temperature ◽  
Nanofluid Flow ◽  
Numerical Work ◽  
Volume Percentage ◽  
Flow And Heat Transfer ◽  
20 Nm

In this numerical work, the cooling performance of water–Al2O3 nanofluid (NF) in a novel microchannel heat sink with wavy walls (WMH-S) is investigated. The focus of this article is on the effect of NP diameter on the cooling efficiency of the heat sink. The heat sink has four inlets and four outlets, and it receives a constant heat flux from the bottom. CATIA and CAMSOL software were used to design the model and simulate the NF flow and heat transfer, respectively. The effects of the Reynolds number (Re) and volume percentage of nanoparticles (Fi) on the outcomes are investigated. One of the most significant results of this work was the reduction in the maximum and average temperatures of the H-S by increasing both the Re and Fi. In addition, the lowest Tmax and pumping power belong to the state of low NP diameter and higher Fi. The addition of nanoparticles reduces the heat sink maximum temperature by 3.8 and 2.5% at the Reynolds numbers of 300 and 1800, respectively. Furthermore, the highest figure of merit (FOM) was approximately 1.25, which occurred at Re=1800 and Fi = 5%. Eventually, it was revealed that the best performance of the WMH-S was observed in the case of Re=807.87, volume percentage of 0.0437%, and NP diameter of 20 nm.

scholarly journals A Computational Fluid Dynamic Study on Efficiency of a Wavy Microchannel/Heat Sink Containing Various Nanoparticles

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1192
Author(s):  
Yacine Khetib ◽  
Hala M. Abo-Dief ◽  
Abdullah K. Alanazi ◽  
S. Mohammad Sajadi ◽  
Mohsen Sharifpur ◽  
...  
Keyword(s):  
Heat Sink ◽  
Figure Of Merit ◽  
Fluid Dynamic ◽  
Reynolds Numbers ◽  
Microchannel Heat Sink ◽  
Pumping Power ◽  
Two Phase ◽  
Volume Percentage ◽  
The Common ◽  
Maximum Temperatures

In this paper, a common and widely used micro-heat sink (H/S) was redesigned and simulated using computational fluid dynamics methods. This H/S has a large number of microchannels in which the walls are wavy (wavy microchannel heat sink: WMCHS). To improve cooling, two (Al2O3 and CuO) water-based nanofluids (NFs) were used as cooling fluids, and their performance was compared. For this purpose, studies were carried out at three Reynolds numbers (Re) of 500, 1000, and 1500 when the volume percent (φ) of the nanoparticles (NPs) was increased to 2%. The mixture two-phase (T-P) model was utilized to simulate the NFs. Results showed that using the designed WMCHS compared to the common H/S reduces the average and maximum temperatures (T-Max) up to 2 °C. Moreover, using the Al2O3 NF is more suitable in terms of WMCHS temperature uniformity as well as its thermal resistance compared to the CuO NF. Increasing the φ is desirable in terms of temperature, but it enhances the pumping power (PP). Besides, the Figure of Merit (FOM) was investigated, and it was found that the value is greater at a higher volume percentage.

Numerical Analysis of Blockage and Optimization of Heat Transfer Performance of Fractal-like Microchannel Nets

2005 ◽  
Vol 128 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Xiang-Qi Wang ◽  
Arun S. Mujumdar ◽  
Christopher Yap
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Flow Resistance ◽  
Heat Transfer Performance ◽  
Three Dimensional ◽  
Constant Heat Flux ◽  
Low Flow ◽  
Flow And Heat Transfer ◽  
Computational Fluid Dynamics Cfd ◽  
Number Of Branches

The conjugate fluid flow and heat transfer characteristics of fractal-like microchannel nets embedded in a disk-shape heat sink are investigated using a three-dimensional computational fluid dynamics (CFD) approach. A constant heat flux is applied to the top wall of the heat sink. The intrinsic advantages of fractal-like microchannel nets such as low flow resistance, temperature uniformity, and reduced danger of blockage compared with the traditional parallel channel nets are demonstrated. In addition, various optimized designs with parameters such as the number of branches, number of branching levels, and number of channels that reach the center of the disk are addressed in this context.

Fluid Flow and Heat Transfer Characteristics of a Centrifugal Heat Sink

2009 ◽  
Author(s):  
Juwan Kim ◽  
Sung Jin Kim
Keyword(s):  
Thermal Resistance ◽  
Flow Rate ◽  
Heat Sink ◽  
Volumetric Flow Rate ◽  
Design Principles ◽  
Constant Heat Flux ◽  
Centrifugal Fan ◽  
Flow And Heat Transfer ◽  
Relative Structure ◽  
Additional Space

A novel heat sink called a centrifugal heat sink is proposed. The principle of coolant pumping in the centrifugal heat sink is similar to a centrifugal fan. The blades of a fan are arranged to be placed between the fins of the heat sink. Due to the relative structure of the blades and the fins, additional space for the blades of the fan is no longer required for the centrifugal heat sink. Consequently, the centrifugal heat sink makes efficient use of its total amount of cooling space. The shape of the blades for coolant pumping is based on the design principles of centrifugal turbomachinery. Due to the design principles, it is possible to increase the volumetric flow rate of the air through the heat sink. By the rotary motion of the blades, the coolant in the heat sink passes through channels formed by the adjacent fins. In this paper, an experimental investigation is conducted to demonstrate the concept of the centrifugal heat sink. As the speed of the fan increases, the volumetric flow rate is shown to increase proportionally. Thermal performance of the centrifugal heat sink is evaluated in terms of the thermal resistance under the constant heat flux condition. As a result, the thermal resistance of the centrifugal heat sink is shown to decrease as the rotation speed of the centrifugal heat sink increases.

scholarly journals Numerical and Experimental Study of CPU Cooling with Finned Heat Sink and Different P.C. Air Passages Configurations

2018 ◽  
Vol 21 (1) ◽  
pp. 99
Author(s):  
Jalal M. Jalil ◽  
Ekbal H. Ali ◽  
Hiba H. Kurdi
Keyword(s):  
Power Supply ◽  
Heat Sink ◽  
Numerical Results ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Air Velocity ◽  
Air Inlet ◽  
Flow And Heat Transfer ◽  
Cpu Temperature ◽  
Main Components

This study investigated numerically and experimentally fluid flow and heat transfer in the desktop PC. Three patterns of the positions of air inlet and outlet were tested to find the best one for cooling. The computer components in the present study are CPU, finned heat sink, power supply, motherboard, CD, HDD and fans. Three components which were generate heat are CPU, motherboard and power supply and there were two openings for air inlet and two for air outlet. The air inlet velocities were 1.2, 1.8, 2.4 m/s with constant CPU fan velocity. The studied parameters were the changed of inlet air velocity, powers of CPU, motherboard and PSU and the positions of inlet air. The numerical results obtained are found in a good agreement with the experimental results. The experimental results show that the maximum temperature was 81  at 16.5 W and 1.2 m/s. Numerical results showed that the CPU temperature reaches 89.6  at 18.5 W and 1.2 m/s. From the results, it was found that; the temperatures of the main components (PSU and motherboard) affected little by CPU power and vice versa, the finned heat sink has higher cooling efficiency and the pattern 1 was the best pattern for CPU cooling.

scholarly journals Numerical Analysis of The Thermo-Convective Behaviour of an Al2O3-H2O Nanofluid Flow Inside a Channel with Trapezoidal Corrugations

2021 ◽  
Vol 89 (2) ◽  
pp. 114-127
Author(s):  
Mostefaoui Amina ◽  
Saim Rachid ◽  
Abboudi Saïd
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Volume Fraction ◽  
High Volume ◽  
Reynolds Numbers ◽  
Constant Heat Flux ◽  
Nanofluid Flow ◽  
Nanoparticle Diameter ◽  
Flow Through ◽  
Volume Method

In this present article, a study of the dynamic and thermal behavior of the Al2O3-water nanofluid flow through a channel provided with trapezoidal undulations, under the action of a constant heat flux. To do this, the effect of various volume fractions (0-4%) and that of the nanoparticle diameter (30, 40, 60 nm) on the heat transfer and pressure drop within the channel was analyzed, for a range of Reynolds numbers between 100 to 1000. The equations governing the fluid flow, namely the equations of continuity, momentum and energy were integrated and discretized based on the finite volume method (FVM). The obtained results indicated that using nanofluids with a high-volume fraction and a small nanoparticle diameter makes it possible to improve the performance of the system in terms of heat transfer, pressure drop and friction factor.

Liquid Impingement Flow and Heat Transfer of a Cone Heat Sink With Filet Profiles

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Zhiguo Tang ◽  
Feng Zhang ◽  
Shoucheng Wang ◽  
Jianping Cheng
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heat Sink ◽  
Pressure Coefficient ◽  
Jet Impingement ◽  
Reynolds Numbers ◽  
Bottom Edge ◽  
Convex Surfaces ◽  
Flow And Heat Transfer ◽  
Heat Transfers

Abstract Jet impingement is a technique for removing heat efficiently. A liquid jet impingement on a cone heat sink was investigated numerically to explore the effect of filet profiles at the top and bottom edge of conical protuberances on fluid flow and heat transfer. An adopted turbulence model was validated through an experiment as described in the literature. Numerical results of pressure coefficient and Nusselt number were obtained for cases with and without filet profiles for variable jet Reynolds numbers and conical angles. Results showed that the flow and heat transfer of conical protuberances with small tip filet profiles are similar to that of the original cone. Pressure coefficient curves are similar to that of convex surfaces, and the average heat transfer slightly increases when the radius of the tip filet profiles exceeds 1 mm. A small filet profile of a conical bottom edge can improve the average Nusselt number. A secondary jet that enhanced the overall heat transfer was demonstrated, and the heat transfers of convex surfaces, as the comparison, with small angles were enhanced in most cases.

Effect of Inter-Connector on Thermo-Hydraulic Characteristics of Parallel and Counter Flow Mini-Channel Heat Sink

2018 ◽  
Author(s):  
Amitav Tikadar ◽  
Saad K. Oudah ◽  
Azzam S. Salman ◽  
A. K. M. M. Morshed ◽  
Titan C. Paul ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Conjugate Heat Transfer ◽  
Single Phase ◽  
Three Dimensional ◽  
Cross Flow ◽  
Constant Heat Flux ◽  
Hydraulic Characteristics ◽  
Counter Flow ◽  
Flow And Heat Transfer

A numerical investigation of three-dimensional conjugate heat transfer was performed to quantify the thermal and hydraulic performance of an inter-connected parallel and counter flow mini-channel heat sink under laminar flow condition and within the single-phase regime. The aspect ratio (height/width) and the hydraulic diameter of the mini-channel were 0.33 and 750μm respectively. Three different widths of the inter-connector were selected to analyze the effect of cross flow for Reynolds number ranging from 150 to 1044, at a constant heat flux (20 W/cm2). To understand the fluid flow and heat transfer mechanism inside the inter-connector and their effects on overall thermal performance of the heat sink, Nusselt number (Nu), friction factor, pumping power, and overall thermal resistance were analyzed. Results show that the inter-connector has significantly higher effect on counter flow mini-channel heat sink than parallel flow mini-channel heat sink.

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