Role of gradients and vortexes on suitable location of discrete heat sources on a sinusoidal-wall microchannel

Liang Cheng, Yufang Zhu, Shahab S. Band, Dariush Bahrami, Rasool Kalbasi, Arash Karimipour, Mehdi Jahangiri, Kwok Wing Chau, Amir Mosavi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The idea of using the compact device with higher heat transfer potential has encouraged researchers to use microchannels. Creating sinusoidal walls is a technique leading to better effectiveness and smaller size. In this study, the effects of discrete heat sources location on heat transfer and pressure drop are investigated, using graphene nanoplatelets/water inside a sinusoidal microchannel. For this, discrete heat sources are installed in a smooth microchannel (layout A) and compared with two sinusoidal-wall microchannels. In layouts B and C, the heating sources are installed above the convergent/diverging sections, respectively. Since the velocity and temperature gradients are higher in the converging region, the heat exchange and pressure drop for layout B are greater than other ones. In other words, installing heating sources in these regions with high-temperature gradient has a more obvious positive efficacy on heat exchange. For the best layout (B), although the heat exchange compared to the base layout (A) is 37.5% higher, the pressure drop and entropy generation are higher by 79% and 35.2%, respectively. By introducing a new figure of merit (FOM), it is found that layout B is in the desirable zone.

Original languageEnglish
Pages (from-to)1176-1190
Number of pages15
JournalEngineering Applications of Computational Fluid Mechanics
Volume15
Issue number1
DOIs
Publication statusPublished - 2021

Keywords

  • discrete heat sources
  • entropy generation
  • Microchannel
  • sinusoidal-wall
  • vortex

ASJC Scopus subject areas

  • Computer Science(all)
  • Modelling and Simulation

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