3-Dimensional numerical study of cooling performance of a heat sink with air-water flow through mini-channel

2016 ◽  
Author(s):  
Sambit Majumder ◽  
Abhik Majumder ◽  
Swapan Bhaumik
Keyword(s):  
Water Flow ◽  
Heat Sink ◽  
Numerical Study ◽  
Cooling Performance ◽  
3 Dimensional ◽  
Flow Through

Experimental Characterization of Two-Phase Flow Through Valves Applied to Liquid-Assisted Gas-Lift

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Renato P. Coutinho ◽  
Paulo J. Waltrich ◽  
Wesley C. Williams ◽  
Parviz Mehdizadeh ◽  
Stuart Scott ◽  
...  
Keyword(s):  
Water Flow ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Water Flow Rate ◽  
Phase Flow ◽  
Experimental Characterization ◽  
Two Phase ◽  
Flow Through ◽  
Gas Lift

Abstract Liquid-assisted gas-lift (LAGL) is a recently developed concept to unload wells using a gas–liquid fluid mixture. The success deployment of the LAGL technology is related to the behavior of two-phase flow through gas-lift valves. For this reason, this work presents an experimental and numerical study on two-phase flow through orifice gas-lift valves used in liquid-assisted gas-lift unloading. To the knowledge of the authors, there is no investigation in the literature on experimental characterization of two-phase flow through gas-lift valves. Experimental data are presented for methane-water flow through gas-lift valves with different orifice port sizes: 12.7 and 17.5 mm. The experiments were performed for pressures ranging from 1.00 to 9.00 MPa, gas flow rates from 0 to 4.71 m3/h, and water flow rate from 0 to 0.68 m3/min. The experimental results are compared to numerical models published in the literature for two-phase flow through restrictions and to commercial multiphase flow simulators. It is observed that some models developed for two-phase flow through restrictions could successfully characterize two-phase flow thorough gas-lift valves with errors lower than 10%. However, it is first necessary to experimentally determine the discharge coefficient (CD) for each gas-lift valve. The commercial flow simulators showed a similar performance as the models available in the literature.

Numerical study on cooling performance of hybrid micro-channel/micro-jet-impingement heat sink

2019 ◽  
Vol 33 (7) ◽  
pp. 3555-3562 ◽  
Author(s):  
Seong Hoon Kim ◽  
Hong-Cheol Shin ◽  
Sung-Min Kim
Keyword(s):  
Heat Sink ◽  
Numerical Study ◽  
Jet Impingement ◽  
Micro Channel ◽  
Cooling Performance

Heat Development and Comparison Between the Steady and Pulsating Flows Through Aluminum Foam Heat Sink

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
A. M. Bayomy ◽  
M. Z. Saghir
Keyword(s):  
Surface Temperature ◽  
Water Flow ◽  
Heat Sink ◽  
Aluminum Foam ◽  
Flow Direction ◽  
Experimental Studies ◽  
Pulsating Flow ◽  
Entry Length ◽  
Flow Through ◽  
Flow Case

Continuous improvements in electronic devices for high-performance computers have led to a need for new and more effective methods of chip cooling. The first purpose of this study was to investigate the heat transfer development and characteristics of aluminum foam heat sink subjected to steady water flow for electronics cooling (Intel core i7 processor). The second purpose was to implement a new type of water flow through the aluminum foam, which is pulsating or oscillating flow in order to achieve more uniform temperature distribution over the electronic surfaces. The aluminum foam heat sink was subjected to a water flow covering the non-Darcy laminar flow regime (297–1353 Reynolds numbers). The bottom side of the heat sink was heated with a heat flux between 8.5 and 13.8 W/cm2. The pulsating flow frequency was ranged from 0.04 to 0.1 Hz. In addition, in order to complement the experimental studies, a numerical model was developed using finite element method and compared with the experimental data. The results revealed that the thermal entry length of the fluid flow through metal foam (porous media) is much smaller than that for laminar internal flow through empty channel. The result also showed that the local surface temperature increases along with increasing the axial flow direction for steady water flow case. On the other hand, for pulsating flow, the local temperature distributions act as a convex profile with the maximum surface temperature at the center of the test section. In addition, it was observed that the pulsating water flow through the aluminum foam heat sink achieves enhancement by 14% in the average Nusselt number and by 73% in temperature uniformity over the surface compared with steady water flow case.

Numerical Investigation of Heat Transfer Enhancement in Heat Sinks With Elongated Hexagonal Fins

2011 ◽  
Author(s):  
Zahra Kheirandish ◽  
Haleh Shafeie ◽  
Omid Abouali
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Numerical Study ◽  
Heat Removal ◽  
Heat Sinks ◽  
Navier Stokes ◽  
Liquid Region ◽  
3 Dimensional ◽  
Solid Region ◽  
Energy Equations

A numerical study was performed for the laminar forced convection of water over a bank of staggered micro fins with cross section of the elongated hexagon. A 3-dimensional mathematical model, for conjugate heat transfer in both solid and liquid is developed. For this aim the Navier-Stokes and energy equations for the liquid region and the energy equation for the solid region are solved simultaneously and the pressure drop as well as the heat transfer characteristics was investigated. The length and width of the studied heat sinks are one centimeter and different heights in the range of 200–500 micrometer were examined for the fluid media. The heat removal of the finned heat sink is compared with an optimum simple mirochannel heat sink. The comparison which is presented at equal pumping powers depicts the enhancement of the heat removal for some specific sizes of the finned heat sink.

scholarly journals Numerical Study of Heat Transfer of Water Flow through Pipe with Property Variations

2017 ◽  
Vol 4 (4) ◽  
pp. 359-386
Author(s):  
Amjad Ali Pasha ◽  
A. Mushtaq ◽  
Khalid A Juhany
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Numerical Study ◽  
Flow Through

Cooling Performance Analysis of Heat Sink

2011 ◽  
Vol 1 (9) ◽  
pp. 65-67
Author(s):  
Pritesh S Patel ◽  
◽  
Prof. Dattatraya G Subhedar ◽  
Prof. Kamlesh V Chauhan
Keyword(s):  
Performance Analysis ◽  
Heat Sink ◽  
Cooling Performance

HEAT TRANSFER BURNOUT IN WATER FLOW THROUGH ROUND TUBES AND ANNULI

1970 ◽  
Author(s):  
B. A. Zenkevich ◽  
P. L. Kirillov ◽  
G. V. Alekseev ◽  
O. L. Peskov ◽  
O. A. Sudnitsyn
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Flow Through
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