Heat transfer characteristics of Cu-based microchannel heat exchanger fabricated by multi-blade milling process

2019 ◽  
Vol 138 ◽  
pp. 559-575 ◽  
Author(s):  
Fang Zhou ◽  
Weisong Ling ◽  
Wei Zhou ◽  
Qingfu Qiu ◽  
Xuyang Chu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Milling Process ◽  
Heat Transfer Characteristics ◽  
Microchannel Heat Exchanger ◽  
Transfer Characteristics

Investigation of the Effect of Cross Section on the Convective Heat Transfer Performance of Nanoemulsion in Microchannel Heat Exchanger

2021 ◽  
Author(s):  
Takele Gameda ◽  
M. Mehdi Kabir ◽  
Jiajun Xu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cross Section ◽  
Cross Sections ◽  
Heat Transfer Performance ◽  
Operating Conditions ◽  
Transfer Performance ◽  
Heat Transfer Characteristics ◽  
Microchannel Heat Exchanger ◽  
Transfer Characteristics

Abstract The present study aims to numerically investigate the effect of cross section on the heat transfer performance of single-phase flow of Ethanol/Polyalphaolefin nanoemulsion fluid with ethanol concentrations of 8 wt.% in a microchannel heat exchanger. While the exterior geometry of the microchannels’ solid structure remains the same, four different cross sections of channels including: circular, upward semi-circular, rectangular, and trapezoidal, are designed with keeping the channels’ wetted perimeters, mass flow rate, and Reynolds number constant for comparison purposes. In the present study, the hydrodynamic and heat transfer characteristics, including local Nusselt number, heat transfer coefficient, and velocity profile, were investigated under a uniform wall heat flux boundary conditions within the laminar flow regime. The channel models of different cross sections were developed by the COMSOL-Multiphysics for numerical analysis. The heat transfer characteristics were then compared for different cross sections under the same operating conditions, and the effect of aspect ratio for rectangular and trapezoidal cross sections were also studied.

Effect of Partition Wall Thickness on Heat Transfer Characteristics of a Gas-to-Gas Counterflow Microchannel Heat Exchanger

2009 ◽  
Author(s):  
K. Koyama ◽  
C. Hong ◽  
Y. Asako
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Wall Thickness ◽  
Arbitrary Lagrangian Eulerian ◽  
Heat Transfer Characteristics ◽  
Partition Wall ◽  
Microchannel Heat Exchanger ◽  
Transfer Characteristics ◽  
Arbitrary Lagrangian Eulerian Method ◽  
Wide Range

Effect of partition wall thickness on heat transfer characteristics of a two-stream counterflow gas-to-gas microchannel heat exchanger has been numerically investigated. The flow passages of the microchannel heat exchanger are plane channels of 100 μm in height and 20 mm in length. The partition wall thickness ranges from 20 μm to 200 μm. The material of the partition wall is assumed to be stainless steel. The numerical methodology is based on the Arbitrary-Lagrangian-Eulerian method. The computations were performed for a wide range of flow rate to investigate effect of partition wall thickness on heat transfer characteristics of the microchannel heat exchanger. The computational results are presented in form of temperature distributions, bulk temperatures, total temperatures, and heat flux variations along the channels. We have concluded that the partition wall thickness affects significantly heat transfer characteristics of a microchannel heat exchanger.

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