Investigation of nanofluids heat transfer in a ribbed microchannel heat sink using single-phase and multiphase CFD models

2015 ◽  
Vol 68 ◽  
pp. 122-129 ◽  
Author(s):  
Z. Yari Ghale ◽  
M. Haghshenasfard ◽  
M. Nasr Esfahany
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Single Phase ◽  
Microchannel Heat Sink ◽  
Cfd Models ◽  
Multiphase Cfd

The Effects of Hybrid Sandblasting Patterns on the Heat Transfer Performance in a Single-Phase Microchannel Heat Sink

2017 ◽  
Author(s):  
Saad K. Oudah ◽  
Ruixian Fang ◽  
Amitav Tikadar ◽  
Karim Egab ◽  
Chen Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Single Phase ◽  
Heat Transfer Performance ◽  
Bottom Surface ◽  
High Heat Flux ◽  
Microchannel Heat Sink ◽  
Transfer Performance ◽  
Two Phase ◽  
Number Range

An experimental investigation was conducted on a single phase microchannel heat sink, in which the bottom surface of the microchannel was modified with hybrid micro-sandblasting of elliptical patterns (HSEP) and fully sandblasting (FS) to passively enhance the microchannel heat transfer performance. The dimension of the microchannel is measured as 26 mm (L) × 5mm (W) × 0.35 mm (H), which results in a hydraulic diameter of 654 μm. Deionized water was used as the coolant, and the Reynolds number range between 85 to 650 was tested. The experimental results show that fully sandblasting (FS) bottom surface of the microchannel only slightly improved the heat transfer performance. However, the modified surface with HSEP enhanced the heat transfer performance substantially, compared to the benchmark results obtained with the bare surface (BS) microchannel. The pressure drops of the HSEP increased slightly compared to the BS and FS, due to the flow resistance of the microstructures. The proposed surface for enhancement of heat transfer will be useful in many high heat flux engineering applications. In the future, this study will be further extended to two-phase microchannel heat transfer.

Effect of 1D Cu Nanostructures on Heat Transfer Characteristics of Single Phase Microchannel Heat Sink

2011 ◽  
Author(s):  
M. Yakut Ali ◽  
Fanghao Yang ◽  
Ruixian Fang ◽  
Chen Li ◽  
Jamil Khan
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Single Phase ◽  
Working Fluid ◽  
Microchannel Heat Sink ◽  
Heat Transfer Characteristics ◽  
Rectangular Microchannel ◽  
Maximum Enhancement ◽  
Cu Nanowires ◽  
Transfer Characteristics

This study experimentally assesses single phase heat transfer characteristics of a shallow rectangular microchannel heat sink whose surface is enhanced with copper nanowires (CuNWs). The hydraulic diameter of the channel is 672 μm and the bottom wall is coated with Cu nanowires (CuNWs) of 200 nm in diameter and 50 μm in length. CuNWs are grown on the Cu heat sink by electrochemical synthesis technique which is inexpensive and readily scalable. The heat transfer and pressure drop results of CuNWs enhanced heat sink are compared with that of bare copper heat sink using deionized (DI) water as the working fluid at Reynolds Number (Re) ranging from 106–636. The experimental results indicate an enhancement in Nusselt Number (Nu) at all Re with a maximum enhancement of 24% at Re = 106. The enhanced thermal performance is attributed to two properties of Cu nanowire arrays — improvement in surface wettability characteristics and increased heat transfer surface area.

Performance Augmentation of Single-Phase Heat Transfer in Open-Type Microchannel Heat Sink

2019 ◽  
Vol 33 (2) ◽  
pp. 416-424 ◽  
Author(s):  
Sambhaji T. Kadam ◽  
Ritunesh Kumar ◽  
Rufat Abiev
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Single Phase ◽  
Microchannel Heat Sink ◽  
Open Type

scholarly journals Study on flow and heat transfer of liquid metal in a new top-slotted microchannel heat sink

2021 ◽  
Vol 621 ◽  
pp. 012054
Author(s):  
Zhiwei Chen ◽  
Peng Qian ◽  
Zizhen Huang ◽  
Chengyuan Luo ◽  
Minghou Liu
Keyword(s):  
Heat Transfer ◽  
Liquid Metal ◽  
Heat Sink ◽  
Microchannel Heat Sink ◽  
Flow And Heat Transfer

scholarly journals Effect of liquid cooling on PCR performance with the parametric study of cross-section shapes of microchannels

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yousef Alihosseini ◽  
Mohammad Reza Azaddel ◽  
Sahel Moslemi ◽  
Mehdi Mohammadi ◽  
Ali Pormohammad ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Heat Sink ◽  
Evaluation Criteria ◽  
Circular Cross Section ◽  
Microchannel Heat Sink ◽  
Liquid Cooling ◽  
Maximum Heat ◽  
Maximum Heat Transfer

AbstractIn recent years, PCR-based methods as a rapid and high accurate technique in the industry and medical fields have been expanded rapidly. Where we are faced with the COVID-19 pandemic, the necessity of a rapid diagnosis has felt more than ever. In the current interdisciplinary study, we have proposed, developed, and characterized a state-of-the-art liquid cooling design to accelerate the PCR procedure. A numerical simulation approach is utilized to evaluate 15 different cross-sections of the microchannel heat sink and select the best shape to achieve this goal. Also, crucial heat sink parameters are characterized, e.g., heat transfer coefficient, pressure drop, performance evaluation criteria, and fluid flow. The achieved result showed that the circular cross-section is the most efficient shape for the microchannel heat sink, which has a maximum heat transfer enhancement of 25% compared to the square shape at the Reynolds number of 1150. In the next phase of the study, the circular cross-section microchannel is located below the PCR device to evaluate the cooling rate of the PCR. Also, the results demonstrate that it takes 16.5 s to cool saliva samples in the PCR well, which saves up to 157.5 s for the whole amplification procedure compared to the conventional air fans. Another advantage of using the microchannel heat sink is that it takes up a little space compared to other common cooling methods.

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