Cooling characteristics and entropy production of nanofluid flowing through tube

C. J. Ho, Chu Yun Cheng, Tien Fu Yang, Saman Rashidi, Wei Mon Yan

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this work, the cooling effectiveness and entropy production of aluminum oxide–water nanofluid flow and heat transfer in the circular tube with the wall conduction effects are explored. All values of heat transfer effectiveness ratios are more than unity in this study. For a constant value of nanoparticles concentration, both heat transfer effectiveness ratios increase as the input temperature of fluid is increased. Both heat transfer effectiveness ratios are increased as the concentration of nanoparticles increases. Predictions show that all values of dimensionless local entropy production ratio are less than unity in this study except in the areas near the entrance of the heating part. This means that the usage of nanofluid is beneficial for decreasing the irreversibility of the system. The dimensionless local entropy production ratio decreases when the input temperature of fluid increases. The maximum value of Biw = 5 × 10-4 was reported for the Biot number in this study, which is far less than 0.1. As a consequence, the tube wall can be regarded as a Lumped system, and it is a reasonable assumption to ignore the radial thermal resistance.

Original languageEnglish
Pages (from-to)427-441
Number of pages15
JournalAEJ - Alexandria Engineering Journal
Volume61
Issue number1
DOIs
Publication statusPublished - 2022 Jan

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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