An Unsteady Mixed Convection in a Driven Cavity Filled with Nanofluids Using an Externally Oscillating Lid - Journal of Electronics Cooling and Thermal Control

Journal of Electronics Cooling and Thermal Control

Volume 3, Issue 2 (June 2013)

ISSN Print: 2162-6162 ISSN Online: 2162-6170

Google-based Impact Factor: 0.25 Citations

An Unsteady Mixed Convection in a Driven Cavity Filled with Nanofluids Using an Externally Oscillating Lid ()

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DOI: 10.4236/jectc.2013.32008 5,104 Downloads 9,932 Views Citations

Author(s)

Arian Jafari, Mohammad Hassan Rahimian, Alireza Saeedmanesh

Affiliation(s)

Mechanical Engineering Department, University College of Engineering, University of Tehran, Tehran, Iran.

ABSTRACT

A numerical investigation of an unsteady, periodic, laminar mixed-convection in a cavity utilized with copper-water nanofluid is presented. In this study both top and bottom walls are assumed to be isolated, meanwhile sidewalls are considered under constant temperature condition. We consider a time-dependent oscillating wall on top to fulfill a periodic mixed-convection inside the cavity. In this type of problems both Grashof and Reynolds numbers play a great role in flow pattern and heat transfer characteristics, so we focus our study on four major parameters that can be crucial such as Grashof

and Reynolds

numbers, solid volume fraction

and the non-dimensional lid frequency

. The obtained results show that the augmentation of Reynolds number and Grashof number would enhance the average Nusselt number. It is also found that unlike steady state condition, at high Reynolds numbers, as lid is moving in the negative direction the average Nusselt number on the hot wall becomes higher in respect to the case that lid is moving in the positive direction due to thermal boundary layer disturbance. Lid frequency does not have a significant effect on thermal characteristics at low Reynolds numbers, meanwhile at higher Reynolds numbers, increment of lid frequency results in heat transfer reduction. Moreover, solid volume fraction is found to have better efficiency at higher Grashof numbers.

KEYWORDS

Mixed Convection; Unsteady; Cavity; Grashof Number; Reynolds Number; Lid Frequency; Solid Volume Fraction

Share and Cite:

Jafari, A. , Rahimian, M. and Saeedmanesh, A. (2013) An Unsteady Mixed Convection in a Driven Cavity Filled with Nanofluids Using an Externally Oscillating Lid. Journal of Electronics Cooling and Thermal Control, 3, 58-73. doi: 10.4236/jectc.2013.32008.

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