Laminar convective nanofluid flow over a backward-facing step with an elastic bottom wall

[+] Author and Article Information
Fatih Selimefendigil

Associate Professor, Department of Mechanical Engineering, Celal Bayar Univeristy, Manisa, 45140, Turkey

Hakan F. Oztop

Professor, Department of Mechanical Engineering, Technology Faculty, Fırat University, Elazığ 23119, Turkey

1Corresponding author.

ASME doi:10.1115/1.4038738 History: Received July 04, 2017; Revised October 21, 2017


In this study, laminar forced convective nanofluid flow over a backward facing step was numerically investigated. The bottom wall downstream of the step was flexible and finite element method was used to solve the governing equations. Simulations were performed for a range of Reynolds number, elastic modulus and solid particle volume fraction . It was observed that the flexibility of the bottom wall results in the variation of the fluid flow and heat transfer characteristics. As the value of Reynolds number and solid particle volume fraction enhances, local and average heat transfer rate increases. At the highest value of Reynolds number, heat transfer rate is higher for the case with the wall with having lowest value of elastic modulus whereas the situation is reversed for other value of Reynolds number. Average Nusselt number reduces by about 9.21% and increases by about 6.1% for the flexible wall with the lowest elastic modulus as compared to a rigid bottom wall for Reynolds number of 25 and 250. Adding nano-additives to the base fluid results in higher heat transfer enhancements. Average heat transfer rates enhance by about 35.72% and 35.32% at the highest solid particle volume fraction as compared to nanofluid with solid volume fraction of 0.01 for the case with wall at the lowest and highest elastic modulus. A polynomial type correlation for the average Nusselt number along the flexible hot wall was proposed which is dependent on the elastic modulus and solid particle volume fraction.

Copyright (c) 2017 by ASME
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