Comparative study for convective heat transfer of counter-flow wavy double-layer microchannel heat sinks in staggered arrangement

2018 ◽  
Vol 137 ◽  
pp. 228-237 ◽  
Author(s):  
Han Shen ◽  
Yingchun Zhang ◽  
Chi-Chuan Wang ◽  
Gongnan Xie
Keyword(s):  
Heat Transfer ◽  
Comparative Study ◽  
Convective Heat Transfer ◽  
Double Layer ◽  
Convective Heat ◽  
Heat Sinks ◽  
Counter Flow ◽  
Microchannel Heat Sinks ◽  
Staggered Arrangement

Convective Heat Transfer of Parallel-Flow and Counter-Flow Double-Layer Microchannel Heat Sinks in Staggered Arrangement

2017 ◽  
Author(s):  
Han Shen ◽  
Yingchun Zhang ◽  
Hongbin Yan ◽  
Bengt Sunden ◽  
Gongnan Xie
Keyword(s):  
Heat Transfer ◽  
Double Layer ◽  
Electronic Devices ◽  
Structure Design ◽  
Parallel Flow ◽  
Heat Sinks ◽  
Counter Flow ◽  
Microchannel Heat Sinks ◽  
Staggered Arrangement ◽  
Flow Case

Previous research has proved Double-layer Microchannel Heat Sinks (MHSs) to be efficient ways to improve the cooling performance of electronic devices. However, the cooling potential of the upper working liquid cannot be fully utilized to cool down the substrate with the heated elements. In this sense, a concept of staggered double-layer MHS is proposed and designed. The parallel and counter flow directions are considered to investigate the flow arrangement effect. The Reynolds number effect, Nusselt number and pressure drop are analyzed in detail and compared with those of a parallel straight double-layer MHS. It is found that the staggered double-layer MHSs exhibit much better heat transfer enhancement and overall thermal performance compared with the parallel straight double-layer MHS. For the staggered double-layer MHSs, the counter flow case is superior to the parallel flow case. This research provides a new structure design to enhance the heat transfer in microchannel heat sinks and broad application prospects for heat sinks in the thermal management of high power density electronic devices.

Characterization of Al2O3/Water Nanofluid through Shell and Tube Heat Exchangers over Parallel and Counter Flow

2017 ◽  
Vol 45 ◽  
pp. 155-163 ◽  
Author(s):  
S. Nallusamy
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Mass Flow ◽  
Counter Flow ◽  
Overall Heat Transfer Coefficient ◽  
Nano Fluid ◽  
Shell And Tube

Nanotechnology has become one of the fastest growing scientific and engineering disciplines. Nano fluids have been established to possess enhanced thermal and physical properties such as thermal conductivity, thermal diffusivity, viscosity and convective heat transfer coefficients. The aim of this research article is to analyze the overall heat transfer coefficient by doing an experimental investigation on the convective heat transfer and flow characteristics of a nano fluid. In this research, an attempt was made for the nano fluid consisting of water and 1% volume concentration of Al2O3/water Nano fluid flowing in a parallel flow, counter flow in shell and tube heat exchanger under laminar flow condition. The 50nm diameter Al2O3nanoparticles are used in this investigation and was found that the overall heat transfer coefficient and convective heat transfer coefficient of nano fluid to be slightly higher than that of the base liquid at same mass flow rate and inlet temperature. Three samples of dissimilar mass flow rates have been identified for conducting the experiments and their results are continuously monitored and reported. The experimental analysis results were concluded that the heat transfer and overall heat transfer coefficient enhancement is possible with increase in the mass flow rate of fluid and Al2O3/water nano fluid on a comparative basis.

Sign in / Sign up

Export Citation Format

Share Document