3 years ago

Effect of Al 2 O 3 /water nanofluid on heat transfer of turbulent flow in the inner pipe of a double-pipe heat exchanger

Mingrui Zheng, Dong Han, Faizan Asif, Zetian Si
In this paper, an experimental study was carried out in order to investigate the effects of Al2O3/water nanofluid with a mean diameter of 50 nm on heat transfer performance in a counter flow double-pipe heat exchanger. The nanofluid was used as cold side fluid and passed through the inner pipe of the double-pipe heat exchanger considering fully developed turbulent flow regime with different Reynolds numbers ranging from 20,000 to 60,000. Experiments were conducted in various cold side fluid flow rates ranging from 1.1 to 3.9 m3/h, inlet temperatures of 40 °C and 50 °C at cold side, and Al2O3/water nanofluids of 0.25% and 0.5% nanoparticles volume concentration. Results indicate that the Nusselt number increases with increasing nanoparticles volume concentration and Reynolds number but decreases with the inlet temperature at cold side of double-pipe heat exchanger. The maximum increase of Nu are respectively 23.2% and 32.23% for inlet temperature of 40 °C and 50 °C. In addition, the single-phase model in CFD (Computational Fluid Dynamics) is adopted to simulate the heat transfer performance by ANSYS Fluent commercial software. It is found that the simulated results show a good agreement with the experimental results and results derived from Gnielinski correlation. The maximum error between experimental Nusselt numbers and simulated results are found to be 12.8%. It is concluded that the CFD approach gives good prediction for heat transfer performance in a double-pipe heat exchanger using Al2O3/water nanofluids.

Publisher URL: http://link.springer.com/article/10.1007/s00231-019-02774-z

DOI: 10.1007/s00231-019-02774-z

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.