An experimental setup was developed to study the heat transfer and fluid flow characteristics in rectangular copper microchannels with hydraulic diameter 29.4 microm using TiO2-Water nanofluids. The experimental facility is validated using existing correlations and subsequently tested with 0.1% and 0.3% concentrations of TiO2 nanofluids. The thermal resistance of heat sink with nanofluids is compared with the base fluid. It is inferred that 0.3% TiO2-Water nanofluids have 18% lower thermal resistance as compared to base fluid having for the same operating conditions.

Raghuraman D R S

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Nagarajan P.K

Suresh S.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Journal of Nanoscience and Nanotechnology

A numerical study has been carried out to investigate the heat transfer enhancement and <a href="https://www.sciencedirect.com/topics/engineering/fluid-flow-characteristic">fluid flow characteristics</a> for various aspect ratios of <a href="https://www.sciencedirect.com/topics/engineering/rectangular-microchannel">rectangular micro channel</a> heat sinks (MCHS). The working fluid considered for the analysis is water. The fluid flow and heat transfer characteristics of a three-dimensional MCHS are obtained numerically by solving the appropriate governing equations. The flow domain is discretized as finite volume elements and solved using ANSYS CFX 14.5, commercially available CFD code. The numerically predicted results obtained through CFD code are validated with the experiments carried out and it is found that the maximum deviation between the two is less than 5%. Hence the CFD code is further extended to study the influence of geometrical parameters. The channel size optimization has been carried out numerically to obtain the effective heat removal from the MCHS. Average <a href="https://www.sciencedirect.com/topics/engineering/convective-heat-transfer-coefficient">convective heat transfer coefficient</a>, outlet temperature, friction and pressure drop, pumping power and <a href="https://www.sciencedirect.com/topics/engineering/thermal-resistance">thermal resistance</a> have been plotted against <a href="https://www.sciencedirect.com/topics/engineering/reynolds-number">Reynolds number</a>. Non-dimensional parameter, <a href="https://www.sciencedirect.com/topics/engineering/nusselt-number">Nusselt number</a> has been plotted as a function of Reynolds number for three heat sinks with different aspect ratios. <a href="https://www.sciencedirect.com/topics/engineering/friction-factor">Friction factor</a> and pressure drop across the channels are obtained and plotted across the channels.

Fulltext

Alexandria Engineering Journal

Influence of aspect ratio on the thermal performance of rectangular shaped micro channel heat sink using CFD code

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Thermal Performance of Higher Aspect Ratio Microchannels Using TiO2-Water Nanofluids

Journal	Data powered by TypesetJournal of Nanoscience and Nanotechnology
Publisher	Data powered by TypesetAmerican Scientific Publishers
ISSN	1533-4880
Open Access	0